Detailed description of how to add and execute actions in WordPress using the wordpress_php tutorial

A detailed description of how to add and execute actions in WordPress, using the method of WordPress

Add_action () (Add action)
The Add_action () function is used to mount a function onto an action hook.

Usage

Add_action ($tag, $function _to_add, $priority, $accepted _args);

Parameters

$hook

(string) (must) the action name of the Mount function.

Default value: None

$function _to_add

(callback function) (must) mount the function, directly fill in the function name in the form of a string.

Default value: None

$priority

(integer) (optional) The priority of the action execution, and the smaller the number, the first is executed.

Default value: 10

$accepted _args

(integer) (optional) The callback function receives several parameters.

Default value: 1

return value

(Boolean) always returns TRUE.

Example

Attach a function to the Wp_head action and print out something in the Head tab.

function Bing_wp_head_test_print () {  echo '
 
   ;} Add_action (' Wp_head ', ' bing_wp_head_test_print ');

Other

The function is located at: wp-includes/plugin.php

Do_action () (Perform action)
Do_action () is used to execute an action hook, and the difference between it and apply_filters () is that there is no return value, simply that the plug-in or the theme developer-mounted function is executed in a particular place, Typically exist on a particular node or event (such as when you start loading a topic template or when you post an article).

Usage

Do_action ($tag, $arg ...);

Parameters

$tag

(string) (must) the name of the action to be performed.

$arg

(mixed) (optional) additional parameters, will be passed to the function of the call, you can add unlimited, such as saving the article when the trigger Save_post action, you can put the ID of the saved article in, let the callback function according to the article ID to operate.

return value

None

Example

function func () {  echo ' Test ';} Add_action (' Test ', ' func ');d o_action (' Test ');

Screen printing:

Test

More references to similar apply_filters (): http://www.endskin.com/apply_filters/

Other

This function is located at: wp-includes/plugin.php

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