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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 |
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275 | * Calls the callback functions that have been added to a filter hook. |
276 | * |
277 | * @since 4.7.0 |
278 | * |
279 | * @param mixed $value The value to filter. |
280 | * @param array $args Additional parameters to pass to the callback functions. |
281 | * This array is expected to include $value at index 0. |
282 | * @return mixed The filtered value after all hooked functions are applied to it. |
283 | */ |
284 | public function apply_filters( $value, $args ) { |
285 | if ( ! $this->callbacks ) { |
286 | return $value; |
287 | } |
288 |
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289 | $nesting_level = $this->nesting_level++; |
290 |
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291 | $this->iterations[ $nesting_level ] = array_keys( $this->callbacks ); |
292 | $num_args = count( $args ); |
293 |
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