do_action
( string $hook_name, mixed $arg )调用已添加到action hook中的回调函数。do_action函数简介
此函数调用附加到动作钩子$hook_name的所有函数。通过简单地调用此函数，也可以创建新的动作钩子，使用$hook_name参数指定新钩子的名称。您可以向钩子传递额外的参数，就像使用apply_filper()一样。do_action函数使用举例
// The action callback function.function example_callback( $arg1, $arg2 ) {
// (maybe) do something with the args.
}
add_action( 'example_action', 'example_callback', 10, 2 );
/*
* Trigger the actions by calling the 'example_callback()' function
* that's hooked onto `example_action` above.
*
* - 'example_action' is the action hook.
* - $arg1 and $arg2 are the additional arguments passed to the callback.
$value = do_action( 'example_action', $arg1, $arg2 );
do_action函数参数
$hook_name(string) (Required) 将要执行的action名称。$arg(mixed) (Optional) 传递给附加到该action的函数的附加参数，默认为空。
do_action源代码
文件：wp-includes/plugin.phpfunction do_action( $hook_name, ...$arg ) {
global $wp_filter, $wp_actions, $wp_current_filter;
if ( ! isset( $wp_actions[ $hook_name ] ) ) {
$wp_actions[ $hook_name ] = 1;
} else {
++$wp_actions[ $hook_name ];
}
// Do 'all' actions first.
if ( isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
$all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
_wp_call_all_hook( $all_args );
}
if ( ! isset( $wp_filter[ $hook_name ] ) ) {
if ( isset( $wp_filter['all'] ) ) {
array_pop( $wp_current_filter );
}
return;
}
if ( ! isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
}
if ( empty( $arg ) ) {
$arg[] = '';
} elseif ( is_array( $arg[0] ) && 1 === count( $arg[0] ) && isset( $arg[0][0] ) && is_object( $arg[0][0] ) ) {
// Backward compatibility for PHP4-style passing of `array( &$this )` as action `$arg`.
$arg[0] = $arg[0][0];
}
$wp_filter[ $hook_name ]->do_action( $arg );
array_pop( $wp_current_filter );
}
以上就是青锋建站给大家分享的wordpress使用do_action调用添加到hook的回调函数，青锋建站承接网站建设服务，包括织梦建站，phpcms建站，wordpress建站，CMS系统开发，SEO网站优化，网络营销推广，企业邮箱，400电话。
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