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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 |
|---|---|
| 307 | * Calls the callback functions that have been added to a filter hook. |
| 308 | * |
| 309 | * @since 4.7.0 |
| 310 | * |
| 311 | * @param mixed $value The value to filter. |
| 312 | * @param array $args Additional parameters to pass to the callback functions. |
| 313 | * This array is expected to include $value at index 0. |
| 314 | * @return mixed The filtered value after all hooked functions are applied to it. |
| 315 | */ |
| 316 | public function apply_filters( $value, $args ) { |
| 317 | if ( ! $this->callbacks ) { |
| 318 | return $value; |
| 319 | } |
| 320 | |
| 321 | $nesting_level = $this->nesting_level++; |
| 322 | |
| 323 | $this->iterations[ $nesting_level ] = $this->priorities; |
| 324 | |
| 325 | $num_args = count( $args ); |