doing_filter() – Function | Developer.WordPress.org

Returns whether or not a filter hook is currently being processed.

Description

The function current_filter() only returns the most recent filter being executed.
did_filter() returns the number of times a filter has been applied during the current request.

This function allows detection for any filter currently being executed (regardless of whether it’s the most recent filter to fire, in the case of hooks called from hook callbacks) to be verified.

Parameters

$hook_namestring|nulloptional: Filter hook to check. Defaults to null, which checks if any filter is currently being run.
Default:null

Return

bool Whether the filter is currently in the stack.

Source

function doing_filter( $hook_name = null ) {
	global $wp_current_filter;

	if ( null === $hook_name ) {
		return ! empty( $wp_current_filter );
	}

	return in_array( $hook_name, $wp_current_filter, true );
}

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Used by	Description
_wp_filter_font_directory()`wp-includes/fonts.php`	A callback function for use in the ‘upload_dir’ filter.
wp_get_loading_attr_default()`wp-includes/deprecated.php`	Gets the default value to use for a `loading` attribute on an element.
do_blocks()`wp-includes/blocks.php`	Parses dynamic blocks out of `post_content` and re-renders them.
doing_action()`wp-includes/plugin.php`	Returns whether or not an action hook is currently being processed.

Changelog

Version	Description
3.9.0	Introduced.

User Contributed Notes

Skip to note 3 content

Codex 9 years ago

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To check if any filter is being applied you could write something like this:
```
if (doing_filter() ) {
	// Do Something Here
}
```
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Skip to note 4 content

Akira Tachibana 6 years ago

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(From Codex)
To check whether the ‘posts_results’ filter is being applied you could write something similar to this:
```
if ( doing_filter( 'posts_results' ) ) {
	//Do Something Here
}
```
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doing_filter( string|null $hook_name = null ): bool

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