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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 | * |