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1 <?php |
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2 /** |
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3 * WordPress Category API |
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4 * |
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5 * @package WordPress |
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6 */ |
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7 |
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8 /** |
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9 * Retrieves all category IDs. |
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10 * |
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11 * @since 2.0.0 |
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12 * @link http://codex.wordpress.org/Function_Reference/get_all_category_ids |
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13 * |
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14 * @return object List of all of the category IDs. |
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15 */ |
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16 function get_all_category_ids() { |
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17 if ( ! $cat_ids = wp_cache_get( 'all_category_ids', 'category' ) ) { |
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18 $cat_ids = get_terms( 'category', 'fields=ids&get=all' ); |
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19 wp_cache_add( 'all_category_ids', $cat_ids, 'category' ); |
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20 } |
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21 |
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22 return $cat_ids; |
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23 } |
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24 |
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25 /** |
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26 * Retrieve list of category objects. |
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27 * |
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28 * If you change the type to 'link' in the arguments, then the link categories |
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29 * will be returned instead. Also all categories will be updated to be backwards |
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30 * compatible with pre-2.3 plugins and themes. |
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31 * |
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32 * @since 2.1.0 |
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33 * @see get_terms() Type of arguments that can be changed. |
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34 * @link http://codex.wordpress.org/Function_Reference/get_categories |
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35 * |
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36 * @param string|array $args Optional. Change the defaults retrieving categories. |
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37 * @return array List of categories. |
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38 */ |
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39 function &get_categories( $args = '' ) { |
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40 $defaults = array( 'type' => 'category' ); |
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41 $args = wp_parse_args( $args, $defaults ); |
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42 |
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43 $taxonomy = apply_filters( 'get_categories_taxonomy', 'category', $args ); |
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44 if ( 'link' == $args['type'] ) |
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45 $taxonomy = 'link_category'; |
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46 $categories = (array) get_terms( $taxonomy, $args ); |
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47 |
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48 foreach ( array_keys( $categories ) as $k ) |
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49 _make_cat_compat( $categories[$k] ); |
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50 |
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51 return $categories; |
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52 } |
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53 |
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54 /** |
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55 * Retrieves category data given a category ID or category object. |
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56 * |
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57 * If you pass the $category parameter an object, which is assumed to be the |
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58 * category row object retrieved the database. It will cache the category data. |
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59 * |
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60 * If you pass $category an integer of the category ID, then that category will |
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61 * be retrieved from the database, if it isn't already cached, and pass it back. |
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62 * |
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63 * If you look at get_term(), then both types will be passed through several |
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64 * filters and finally sanitized based on the $filter parameter value. |
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65 * |
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66 * The category will converted to maintain backwards compatibility. |
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67 * |
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68 * @since 1.5.1 |
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69 * @uses get_term() Used to get the category data from the taxonomy. |
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70 * |
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71 * @param int|object $category Category ID or Category row object |
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72 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N |
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73 * @param string $filter Optional. Default is raw or no WordPress defined filter will applied. |
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74 * @return mixed Category data in type defined by $output parameter. |
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75 */ |
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76 function &get_category( $category, $output = OBJECT, $filter = 'raw' ) { |
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77 $category = get_term( $category, 'category', $output, $filter ); |
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78 if ( is_wp_error( $category ) ) |
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79 return $category; |
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80 |
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81 _make_cat_compat( $category ); |
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82 |
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83 return $category; |
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84 } |
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85 |
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86 /** |
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87 * Retrieve category based on URL containing the category slug. |
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88 * |
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89 * Breaks the $category_path parameter up to get the category slug. |
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90 * |
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91 * Tries to find the child path and will return it. If it doesn't find a |
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92 * match, then it will return the first category matching slug, if $full_match, |
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93 * is set to false. If it does not, then it will return null. |
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94 * |
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95 * It is also possible that it will return a WP_Error object on failure. Check |
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96 * for it when using this function. |
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97 * |
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98 * @since 2.1.0 |
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99 * |
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100 * @param string $category_path URL containing category slugs. |
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101 * @param bool $full_match Optional. Whether should match full path or not. |
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102 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N |
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103 * @return null|object|array Null on failure. Type is based on $output value. |
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104 */ |
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105 function get_category_by_path( $category_path, $full_match = true, $output = OBJECT ) { |
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106 $category_path = rawurlencode( urldecode( $category_path ) ); |
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107 $category_path = str_replace( '%2F', '/', $category_path ); |
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108 $category_path = str_replace( '%20', ' ', $category_path ); |
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109 $category_paths = '/' . trim( $category_path, '/' ); |
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110 $leaf_path = sanitize_title( basename( $category_paths ) ); |
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111 $category_paths = explode( '/', $category_paths ); |
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112 $full_path = ''; |
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113 foreach ( (array) $category_paths as $pathdir ) |
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114 $full_path .= ( $pathdir != '' ? '/' : '' ) . sanitize_title( $pathdir ); |
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115 |
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116 $categories = get_terms( 'category', "get=all&slug=$leaf_path" ); |
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117 |
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118 if ( empty( $categories ) ) |
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119 return null; |
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120 |
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121 foreach ( $categories as $category ) { |
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122 $path = '/' . $leaf_path; |
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123 $curcategory = $category; |
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124 while ( ( $curcategory->parent != 0 ) && ( $curcategory->parent != $curcategory->term_id ) ) { |
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125 $curcategory = get_term( $curcategory->parent, 'category' ); |
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126 if ( is_wp_error( $curcategory ) ) |
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127 return $curcategory; |
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128 $path = '/' . $curcategory->slug . $path; |
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129 } |
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130 |
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131 if ( $path == $full_path ) |
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132 return get_category( $category->term_id, $output ); |
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133 } |
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134 |
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135 // If full matching is not required, return the first cat that matches the leaf. |
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136 if ( ! $full_match ) |
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137 return get_category( $categories[0]->term_id, $output ); |
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138 |
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139 return null; |
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140 } |
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141 |
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142 /** |
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143 * Retrieve category object by category slug. |
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144 * |
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145 * @since 2.3.0 |
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146 * |
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147 * @param string $slug The category slug. |
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148 * @return object Category data object |
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149 */ |
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150 function get_category_by_slug( $slug ) { |
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151 $category = get_term_by( 'slug', $slug, 'category' ); |
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152 if ( $category ) |
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153 _make_cat_compat( $category ); |
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154 |
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155 return $category; |
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156 } |
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157 |
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158 |
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159 /** |
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160 * Retrieve the ID of a category from its name. |
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161 * |
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162 * @since 1.0.0 |
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163 * |
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164 * @param string $cat_name Optional. Default is 'General' and can be any category name. |
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165 * @return int 0, if failure and ID of category on success. |
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166 */ |
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167 function get_cat_ID( $cat_name='General' ) { |
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168 $cat = get_term_by( 'name', $cat_name, 'category' ); |
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169 if ( $cat ) |
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170 return $cat->term_id; |
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171 return 0; |
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172 } |
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173 |
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174 |
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175 /** |
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176 * Retrieve the name of a category from its ID. |
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177 * |
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178 * @since 1.0.0 |
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179 * |
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180 * @param int $cat_id Category ID |
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181 * @return string Category name |
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182 */ |
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183 function get_cat_name( $cat_id ) { |
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184 $cat_id = (int) $cat_id; |
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185 $category = &get_category( $cat_id ); |
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186 return $category->name; |
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187 } |
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188 |
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189 |
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190 /** |
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191 * Check if a category is an ancestor of another category. |
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192 * |
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193 * You can use either an id or the category object for both parameters. If you |
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194 * use an integer the category will be retrieved. |
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195 * |
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196 * @since 2.1.0 |
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197 * |
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198 * @param int|object $cat1 ID or object to check if this is the parent category. |
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199 * @param int|object $cat2 The child category. |
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200 * @return bool Whether $cat2 is child of $cat1 |
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201 */ |
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202 function cat_is_ancestor_of( $cat1, $cat2 ) { |
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203 if ( ! isset($cat1->term_id) ) |
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204 $cat1 = &get_category( $cat1 ); |
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205 if ( ! isset($cat2->parent) ) |
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206 $cat2 = &get_category( $cat2 ); |
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207 |
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208 if ( empty($cat1->term_id) || empty($cat2->parent) ) |
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209 return false; |
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210 if ( $cat2->parent == $cat1->term_id ) |
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211 return true; |
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212 |
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213 return cat_is_ancestor_of( $cat1, get_category( $cat2->parent ) ); |
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214 } |
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215 |
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216 |
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217 /** |
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218 * Sanitizes category data based on context. |
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219 * |
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220 * @since 2.3.0 |
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221 * @uses sanitize_term() See this function for what context are supported. |
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222 * |
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223 * @param object|array $category Category data |
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224 * @param string $context Optional. Default is 'display'. |
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225 * @return object|array Same type as $category with sanitized data for safe use. |
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226 */ |
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227 function sanitize_category( $category, $context = 'display' ) { |
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228 return sanitize_term( $category, 'category', $context ); |
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229 } |
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230 |
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231 |
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232 /** |
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233 * Sanitizes data in single category key field. |
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234 * |
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235 * @since 2.3.0 |
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236 * @uses sanitize_term_field() See function for more details. |
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237 * |
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238 * @param string $field Category key to sanitize |
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239 * @param mixed $value Category value to sanitize |
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240 * @param int $cat_id Category ID |
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241 * @param string $context What filter to use, 'raw', 'display', etc. |
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242 * @return mixed Same type as $value after $value has been sanitized. |
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243 */ |
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244 function sanitize_category_field( $field, $value, $cat_id, $context ) { |
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245 return sanitize_term_field( $field, $value, $cat_id, 'category', $context ); |
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246 } |
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247 |
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248 /* Tags */ |
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249 |
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250 |
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251 /** |
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252 * Retrieves all post tags. |
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253 * |
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254 * @since 2.3.0 |
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255 * @see get_terms() For list of arguments to pass. |
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256 * @uses apply_filters() Calls 'get_tags' hook on array of tags and with $args. |
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257 * |
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258 * @param string|array $args Tag arguments to use when retrieving tags. |
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259 * @return array List of tags. |
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260 */ |
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261 function &get_tags( $args = '' ) { |
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262 $tags = get_terms( 'post_tag', $args ); |
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263 |
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264 if ( empty( $tags ) ) { |
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265 $return = array(); |
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266 return $return; |
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267 } |
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268 |
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269 $tags = apply_filters( 'get_tags', $tags, $args ); |
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270 return $tags; |
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271 } |
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272 |
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273 |
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274 /** |
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275 * Retrieve post tag by tag ID or tag object. |
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276 * |
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277 * If you pass the $tag parameter an object, which is assumed to be the tag row |
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278 * object retrieved the database. It will cache the tag data. |
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279 * |
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280 * If you pass $tag an integer of the tag ID, then that tag will |
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281 * be retrieved from the database, if it isn't already cached, and pass it back. |
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282 * |
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283 * If you look at get_term(), then both types will be passed through several |
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284 * filters and finally sanitized based on the $filter parameter value. |
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285 * |
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286 * @since 2.3.0 |
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287 * |
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288 * @param int|object $tag |
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289 * @param string $output Optional. Constant OBJECT, ARRAY_A, or ARRAY_N |
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290 * @param string $filter Optional. Default is raw or no WordPress defined filter will applied. |
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291 * @return object|array Return type based on $output value. |
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292 */ |
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293 function &get_tag( $tag, $output = OBJECT, $filter = 'raw' ) { |
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294 return get_term( $tag, 'post_tag', $output, $filter ); |
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295 } |
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296 |
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297 |
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298 /* Cache */ |
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299 |
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300 |
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301 /** |
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302 * Update the categories cache. |
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303 * |
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304 * This function does not appear to be used anymore or does not appear to be |
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305 * needed. It might be a legacy function left over from when there was a need |
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306 * for updating the category cache. |
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307 * |
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308 * @since 1.5.0 |
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309 * |
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310 * @return bool Always return True |
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311 */ |
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312 function update_category_cache() { |
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313 return true; |
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314 } |
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315 |
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316 |
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317 /** |
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318 * Remove the category cache data based on ID. |
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319 * |
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320 * @since 2.1.0 |
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321 * @uses clean_term_cache() Clears the cache for the category based on ID |
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322 * |
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323 * @param int $id Category ID |
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324 */ |
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325 function clean_category_cache( $id ) { |
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326 clean_term_cache( $id, 'category' ); |
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327 } |
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328 |
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329 |
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330 /** |
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331 * Update category structure to old pre 2.3 from new taxonomy structure. |
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332 * |
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333 * This function was added for the taxonomy support to update the new category |
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334 * structure with the old category one. This will maintain compatibility with |
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335 * plugins and themes which depend on the old key or property names. |
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336 * |
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337 * The parameter should only be passed a variable and not create the array or |
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338 * object inline to the parameter. The reason for this is that parameter is |
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339 * passed by reference and PHP will fail unless it has the variable. |
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340 * |
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341 * There is no return value, because everything is updated on the variable you |
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342 * pass to it. This is one of the features with using pass by reference in PHP. |
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343 * |
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344 * @since 2.3.0 |
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345 * @access private |
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346 * |
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347 * @param array|object $category Category Row object or array |
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348 */ |
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349 function _make_cat_compat( &$category ) { |
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350 if ( is_object( $category ) ) { |
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351 $category->cat_ID = &$category->term_id; |
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352 $category->category_count = &$category->count; |
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353 $category->category_description = &$category->description; |
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354 $category->cat_name = &$category->name; |
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355 $category->category_nicename = &$category->slug; |
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356 $category->category_parent = &$category->parent; |
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357 } elseif ( is_array( $category ) && isset( $category['term_id'] ) ) { |
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358 $category['cat_ID'] = &$category['term_id']; |
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359 $category['category_count'] = &$category['count']; |
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360 $category['category_description'] = &$category['description']; |
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361 $category['cat_name'] = &$category['name']; |
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362 $category['category_nicename'] = &$category['slug']; |
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363 $category['category_parent'] = &$category['parent']; |
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364 } |
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365 } |
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366 |
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367 |
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368 ?> |