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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 890 | $wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], array()); |
| 891 | $wp_filter[$tag][$priority] = array_unique($wp_filter[$tag][$priority]); |
| 892 | } |
| 893 | } |
| 894 | |
| 895 | if ( isset($wp_filter[$tag]) ) |
| 896 | ksort( $wp_filter[$tag] ); |
| 897 | } |
| 898 | |
| 899 | function apply_filters($tag, $string) { |
| 900 | global $wp_filter; |
| 901 | |
| 902 | $args = array_slice(func_get_args(), 2); |
| 903 | |
| 904 | merge_filters($tag); |
| 905 | |
| 906 | if (!isset($wp_filter[$tag])) { |
| 907 | return $string; |
| 908 | } |
| Line | Code |
| 961 | } |
| 962 | } |
| 963 | $wp_filter[$tag]["$priority"] = $new_function_list; |
| 964 | } |
| 965 | return true; |
| 966 | } |
| 967 | |
| 968 | // The *_action functions are just aliases for the *_filter functions, they take special strings instead of generic content |
| 969 | |
| 970 | function do_action($tag, $arg = '') { |
| 971 | global $wp_filter; |
| 972 | $extra_args = array_slice(func_get_args(), 2); |
| 973 | if ( is_array($arg) ) |
| 974 | $args = array_merge($arg, $extra_args); |
| 975 | else |
| 976 | $args = array_merge(array($arg), $extra_args); |
| 977 | |
| 978 | merge_filters($tag); |
| 979 | |