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back-compat.php
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<?php /** * Twenty Thirteen back compat functionality * * Prevents Twenty Thirteen from running on WordPress versions prior to 3.6, * since this theme is not meant to be backward compatible and relies on * many new functions and markup changes introduced in 3.6. * * @package WordPress * @subpackage Twenty_Thirteen * @since Twenty Thirteen 1.0 */ /** * Prevent switching to Twenty Thirteen on old versions of WordPress. * * Switches to the default theme. * * @since Twenty Thirteen 1.0 */ function twentythirteen_switch_theme() { switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME ); unset( $_GET['activated'] ); add_action( 'admin_notices', 'twentythirteen_upgrade_notice' ); } add_action( 'after_switch_theme', 'twentythirteen_switch_theme' ); /** * Add message for unsuccessful theme switch. * * Prints an update nag after an unsuccessful attempt to switch to * Twenty Thirteen on WordPress versions prior to 3.6. * * @since Twenty Thirteen 1.0 */ function twentythirteen_upgrade_notice() { printf( '<div class="error"><p>%s</p></div>', sprintf( /* translators: %s: WordPress version. */ __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ) ); } /** * Prevent the Customizer from being loaded on WordPress versions prior to 3.6. * * @since Twenty Thirteen 1.0 */ function twentythirteen_customize() { wp_die( sprintf( /* translators: %s: WordPress version. */ __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ), '', array( 'back_link' => true, ) ); } add_action( 'load-customize.php', 'twentythirteen_customize' ); /** * Prevent the Theme Preview from being loaded on WordPress versions prior to 3.4. * * @since Twenty Thirteen 1.0 */ function twentythirteen_preview() { if ( isset( $_GET['preview'] ) ) { wp_die( sprintf( /* translators: %s: WordPress version. */ __( 'Twenty Thirteen requires at least WordPress version 3.6. You are running version %s. Please upgrade and try again.', 'twentythirteen' ), $GLOBALS['wp_version'] ) ); } } add_action( 'template_redirect', 'twentythirteen_preview' );
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