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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 |
|---|---|
| 196 | } |
| 197 | |
| 198 | if ( ! isset( $wp_filter['all'] ) ) { |
| 199 | $wp_current_filter[] = $hook_name; |
| 200 | } |
| 201 | |
| 202 | // Pass the value to WP_Hook. |
| 203 | array_unshift( $args, $value ); |
| 204 | |
| 205 | $filtered = $wp_filter[ $hook_name ]->apply_filters( $value, $args ); |
| 206 | |
| 207 | array_pop( $wp_current_filter ); |
| 208 | |
| 209 | return $filtered; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Calls the callback functions that have been added to a filter hook, specifying arguments in an array. |
| 214 | * |