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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 |
|---|---|
| 255 | * Calls the callback functions that have been added to a filter hook. |
| 256 | * |
| 257 | * @since 4.7.0 |
| 258 | * |
| 259 | * @param mixed $value The value to filter. |
| 260 | * @param array $args Additional parameters to pass to the callback functions. |
| 261 | * This array is expected to include $value at index 0. |
| 262 | * @return mixed The filtered value after all hooked functions are applied to it. |
| 263 | */ |
| 264 | public function apply_filters( $value, $args ) { |
| 265 | if ( ! $this->callbacks ) { |
| 266 | return $value; |
| 267 | } |
| 268 | |
| 269 | $nesting_level = $this->nesting_level++; |
| 270 | |
| 271 | $this->iterations[ $nesting_level ] = array_keys( $this->callbacks ); |
| 272 | $num_args = count( $args ); |
| 273 | |