Core Function
View Source on Trac ↗ has_filter()
has_filter( mixed $hook_name, mixed $callback = false ) Checks if any filter has been registered for a hook.
Parameters 2 required
| Name / Type | Description |
|---|---|
| $hook_name string | The name of the filter hook. Required |
| mixed | (callable | string | array | false) $callback Optional. The callback to check for. This function can be called unconditionally to speculatively check a callback that may or may not exist. Default false. Required |
Return Value
((bool)
(bool | int) If `$callback` is omitted, returns boolean for whether the hook has
anything registered. When checking a specific function, the priority
of that hook is returned, or false if the function is not attached.
Function Information
Since Version
2.5.0
Source File
wp-includes/plugin.php
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