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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 |
|---|---|
| 1228 | $wp_filter[$tag][$priority] = array_merge($wp_filter['all'][$priority], array()); |
| 1229 | $wp_filter[$tag][$priority] = array_unique($wp_filter[$tag][$priority]); |
| 1230 | } |
| 1231 | } |
| 1232 | |
| 1233 | if ( isset($wp_filter[$tag]) ) |
| 1234 | uksort( $wp_filter[$tag], "strnatcasecmp" ); |
| 1235 | } |
| 1236 | |
| 1237 | function apply_filters($tag, $string) { |
| 1238 | global $wp_filter; |
| 1239 | |
| 1240 | $args = array_slice(func_get_args(), 2); |
| 1241 | |
| 1242 | merge_filters($tag); |
| 1243 | |
| 1244 | if ( !isset($wp_filter[$tag]) ) { |
| 1245 | return $string; |
| 1246 | } |
| Line | Code |
| 1299 | } |
| 1300 | } |
| 1301 | $wp_filter[$tag]["$priority"] = $new_function_list; |
| 1302 | } |
| 1303 | return true; |
| 1304 | } |
| 1305 | |
| 1306 | // The *_action functions are just aliases for the *_filter functions, they take special strings instead of generic content |
| 1307 | |
| 1308 | function do_action($tag, $arg = '') { |
| 1309 | global $wp_filter; |
| 1310 | $extra_args = array_slice(func_get_args(), 2); |
| 1311 | if ( is_array($arg) ) |
| 1312 | $args = array_merge($arg, $extra_args); |
| 1313 | else |
| 1314 | $args = array_merge(array($arg), $extra_args); |
| 1315 | |
| 1316 | merge_filters($tag); |
| 1317 | |