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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 |
---|---|
925 | * @since 3.0.0 |
926 | * |
927 | * @param string $key String key |
928 | * @return string Sanitized key |
929 | */ |
930 | function sanitize_key( $key ) { |
931 | $raw_key = $key; |
932 | $key = strtolower( $key ); |
933 | $key = preg_replace( '/[^a-z0-9_\-]/', '', $key ); |
934 | return apply_filters( 'sanitize_key', $key, $raw_key ); |
935 | } |
936 |
|
937 | /** |
938 | * Sanitizes a title, or returns a fallback title. |
939 | * |
940 | * Specifically, HTML and PHP tags are stripped. Further actions can be added |
941 | * via the plugin API. If $title is empty and $fallback_title is set, the latter |
942 | * will be used. |
943 | * |