apply_filters()

描述

The callback functions attached to the filter hook are invoked by calling this function. This function can be used to create a new filter hook by simply calling this function with the name of the new hook specified using the $tag parameter.

The function also allows for multiple additional arguments to be passed to hooks.

Example usage:

// The filter callback function.
function example_callback( $string, $arg1, $arg2 ) {
 // (maybe) modify $string.
 return $string;
}
add_filter( 'example_filter', 'example_callback', 10, 3 );
/*
 * Apply the filters by calling the 'example_callback()' function
 * that's hooked>
参数
$tag
 (string)
 (Required)
 The name of the filter hook. 
$value
 (mixed)
 (Required)
 The value to filter. 
$args
 (mixed)
 (Required)
 Additional parameters to pass to the callback functions.