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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 |
|---|---|
| 767 | // Kill octets |
| 768 | $key = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '', $key); |
| 769 | $key = preg_replace('/&.+?;/', '', $key); // Kill entities |
| 770 | |
| 771 | $key = preg_replace('|[^a-z0-9 _.\-@]|i', '', $key); |
| 772 | |
| 773 | // Consolidate contiguous whitespace |
| 774 | $key = preg_replace('|\s+|', ' ', $key); |
| 775 | |
| 776 | return apply_filters('sanitize_key', $key, $raw_key); |
| 777 | } |
| 778 | |
| 779 | /** |
| 780 | * Sanitizes title or use fallback title. |
| 781 | * |
| 782 | * Specifically, HTML and PHP tags are stripped. Further actions can be added |
| 783 | * via the plugin API. If $title is empty and $fallback_title is set, the latter |
| 784 | * will be used. |
| 785 | * |