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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 |
|---|---|
| 765 | * @since 3.0.0 |
| 766 | * |
| 767 | * @param string $key String key |
| 768 | * @return string Sanitized key |
| 769 | */ |
| 770 | function sanitize_key( $key ) { |
| 771 | $raw_key = $key; |
| 772 | $key = strtolower( $key ); |
| 773 | $key = preg_replace( '/[^a-z0-9_\-]/', '', $key ); |
| 774 | return apply_filters( 'sanitize_key', $key, $raw_key ); |
| 775 | } |
| 776 | |
| 777 | /** |
| 778 | * Sanitizes title or use fallback title. |
| 779 | * |
| 780 | * Specifically, HTML and PHP tags are stripped. Further actions can be added |
| 781 | * via the plugin API. If $title is empty and $fallback_title is set, the latter |
| 782 | * will be used. |
| 783 | * |