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1 <?php |
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2 |
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3 if (class_exists('SplFixedArray')) { |
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4 return; |
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5 } |
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6 |
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7 /** |
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8 * The SplFixedArray class provides the main functionalities of array. The |
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9 * main differences between a SplFixedArray and a normal PHP array is that |
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10 * the SplFixedArray is of fixed length and allows only integers within |
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11 * the range as indexes. The advantage is that it allows a faster array |
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12 * implementation. |
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13 */ |
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14 class SplFixedArray implements Iterator, ArrayAccess, Countable |
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15 { |
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16 /** @var array<int, mixed> */ |
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17 private $internalArray = array(); |
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18 |
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19 /** @var int $size */ |
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20 private $size = 0; |
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21 |
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22 /** |
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23 * SplFixedArray constructor. |
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24 * @param int $size |
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25 */ |
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26 public function __construct($size = 0) |
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27 { |
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28 $this->size = $size; |
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29 $this->internalArray = array(); |
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30 } |
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31 |
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32 /** |
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33 * @return int |
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34 */ |
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35 public function count() |
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36 { |
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37 return count($this->internalArray); |
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38 } |
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39 |
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40 /** |
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41 * @return array |
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42 */ |
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43 public function toArray() |
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44 { |
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45 ksort($this->internalArray); |
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46 return (array) $this->internalArray; |
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47 } |
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48 |
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49 /** |
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50 * @param array $array |
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51 * @param bool $save_indexes |
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52 * @return SplFixedArray |
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53 * @psalm-suppress MixedAssignment |
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54 */ |
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55 public static function fromArray(array $array, $save_indexes = true) |
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56 { |
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57 $self = new SplFixedArray(count($array)); |
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58 if($save_indexes) { |
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59 foreach($array as $key => $value) { |
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60 $self[(int) $key] = $value; |
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61 } |
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62 } else { |
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63 $i = 0; |
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64 foreach (array_values($array) as $value) { |
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65 $self[$i] = $value; |
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66 $i++; |
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67 } |
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68 } |
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69 return $self; |
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70 } |
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71 |
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72 /** |
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73 * @return int |
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74 */ |
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75 public function getSize() |
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76 { |
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77 return $this->size; |
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78 } |
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79 |
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80 /** |
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81 * @param int $size |
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82 * @return bool |
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83 */ |
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84 public function setSize($size) |
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85 { |
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86 $this->size = $size; |
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87 return true; |
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88 } |
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89 |
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90 /** |
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91 * @param string|int $index |
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92 * @return bool |
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93 */ |
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94 public function offsetExists($index) |
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95 { |
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96 return array_key_exists((int) $index, $this->internalArray); |
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97 } |
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98 |
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99 /** |
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100 * @param string|int $index |
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101 * @return mixed |
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102 */ |
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103 public function offsetGet($index) |
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104 { |
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105 return $this->internalArray[(int) $index]; |
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106 } |
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107 |
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108 /** |
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109 * @param string|int $index |
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110 * @param mixed $newval |
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111 * @psalm-suppress MixedAssignment |
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112 */ |
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113 public function offsetSet($index, $newval) |
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114 { |
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115 $this->internalArray[(int) $index] = $newval; |
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116 } |
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117 |
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118 /** |
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119 * @param string|int $index |
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120 */ |
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121 public function offsetUnset($index) |
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122 { |
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123 unset($this->internalArray[(int) $index]); |
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124 } |
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125 |
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126 /** |
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127 * Rewind iterator back to the start |
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128 * @link https://php.net/manual/en/splfixedarray.rewind.php |
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129 * @return void |
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130 * @since 5.3.0 |
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131 */ |
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132 public function rewind() |
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133 { |
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134 reset($this->internalArray); |
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135 } |
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136 |
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137 /** |
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138 * Return current array entry |
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139 * @link https://php.net/manual/en/splfixedarray.current.php |
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140 * @return mixed The current element value. |
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141 * @since 5.3.0 |
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142 */ |
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143 public function current() |
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144 { |
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145 return current($this->internalArray); |
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146 } |
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147 |
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148 /** |
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149 * Return current array index |
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150 * @return int The current array index. |
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151 */ |
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152 public function key() |
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153 { |
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154 return key($this->internalArray); |
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155 } |
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156 |
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157 /** |
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158 * @return void |
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159 */ |
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160 public function next() |
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161 { |
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162 next($this->internalArray); |
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163 } |
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164 |
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165 /** |
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166 * Check whether the array contains more elements |
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167 * @link https://php.net/manual/en/splfixedarray.valid.php |
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168 * @return bool true if the array contains any more elements, false otherwise. |
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169 */ |
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170 public function valid() |
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171 { |
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172 if (empty($this->internalArray)) { |
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173 return false; |
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174 } |
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175 $result = next($this->internalArray) !== false; |
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176 prev($this->internalArray); |
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177 return $result; |
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178 } |
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179 |
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180 /** |
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181 * Do nothing. |
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182 */ |
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183 public function __wakeup() |
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184 { |
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185 // NOP |
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186 } |
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187 } |