首页 WordPress函数大全 has_filter()

has_filter()

2020-05-02 / 2431阅 / 悠然

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has_filter( string $tag, callable|bool $function_to_check = false )

Check if any filter has been registered for a hook.

描述

参数

$tag

(string)
(Required)
The name of the filter hook.

$function_to_check

(callable|bool)
(Optional)
The callback to check for.

Default value: false

返回

(false|int) If $function_to_check 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. When using the $function_to_check argument, this function may return a non-boolean value that evaluates to false (e.g.) 0, so use the === operator for testing the return value.

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