1 <?php

     2 /**

     3  * Twenty Thirteen back compat functionality

     4  *

     5  * Prevents Twenty Thirteen from running on WordPress versions prior to 3.6,

     6  * since this theme is not meant to be backward compatible and relies on

     7  * many new functions and markup changes introduced in 3.6.

     8  *

     9  * @package WordPress

    10  * @subpackage Twenty_Thirteen

    11  * @since Twenty Thirteen 1.0

    12  */

    13 

    14 /**

    15  * Prevent switching to Twenty Thirteen on old versions of WordPress.

    16  *

    17  * Switches to the default theme.

    18  *

    19  * @since Twenty Thirteen 1.0

    20  *

    21  * @return void

    22  */

    23 function twentythirteen_switch_theme() {

    24 	switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );

    25 	unset( $_GET['activated'] );

    26 	add_action( 'admin_notices', 'twentythirteen_upgrade_notice' );

    27 }

    28 add_action( 'after_switch_theme', 'twentythirteen_switch_theme' );

    29 

    30 /**

    31  * Add message for unsuccessful theme switch.

    32  *

    33  * Prints an update nag after an unsuccessful attempt to switch to

    34  * Twenty Thirteen on WordPress versions prior to 3.6.

    35  *

    36  * @since Twenty Thirteen 1.0

    37  *

    38  * @return void

    39  */

    40 function twentythirteen_upgrade_notice() {

    41 	$message = sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] );

    42 	printf( '<div class="error"><p>%s</p></div>', $message );

    43 }

    44 

    45 /**

    46  * Prevent the Theme Customizer from being loaded on WordPress versions prior to 3.6.

    47  *

    48  * @since Twenty Thirteen 1.0

    49  *

    50  * @return void

    51  */

    52 function twentythirteen_customize() {

    53 	wp_die( sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ), '', array(

    54 		'back_link' => true,

    55 	) );

    56 }

    57 add_action( 'load-customize.php', 'twentythirteen_customize' );

    58 

    59 /**

    60  * Prevent the Theme Preview from being loaded on WordPress versions prior to 3.4.

    61  *

    62  * @since Twenty Thirteen 1.0

    63  *

    64  * @return void

    65  */

    66 function twentythirteen_preview() {

    67 	if ( isset( $_GET['preview'] ) ) {

    68 		wp_die( sprintf( __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ) );

    69 	}

    70 }

    71 add_action( 'template_redirect', 'twentythirteen_preview' );