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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 520 | $link = "?$link"; |
| 521 | return $matches[1] . attribute_escape( $link ) . $matches[4]; |
| 522 | } |
| 523 | |
| 524 | function switch_theme($template, $stylesheet) { |
| 525 | update_option('template', $template); |
| 526 | update_option('stylesheet', $stylesheet); |
| 527 | delete_option('current_theme'); |
| 528 | $theme = get_current_theme(); |
| 529 | do_action('switch_theme', $theme); |
| 530 | } |
| 531 | |
| 532 | function validate_current_theme() { |
| 533 | // Don't validate during an install/upgrade. |
| 534 | if ( defined('WP_INSTALLING') ) |
| 535 | return true; |
| 536 | |
| 537 | if ( get_template() != 'default' && !file_exists(get_template_directory() . '/index.php') ) { |
| 538 | switch_theme('default', 'default'); |