函数参考/add action

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Description

This Template is used by Codex:Template Messages.

Usage

pre 检查到模板循环：模板:Message /pre

Result

检查到模板循环：模板:Message

/noinclude

说明

在指定的action上挂载（挂钩机制）一个函数。

对于这些动作，您可以在Plugin API/Action Reference上查看。当在Wordpress内部调用do_action()时，这些动作将被触发。

用法

%%% <?php add_action( $tag, $function_to_add, $priority, $accepted_args ); ?> %%%

参数

tt$tag/tt
(string) (参数必需) 动作的名字。 (对于这些动作，您可以在Plugin API/Action Reference上查看。)
Default: 没有默认值noinclude

div class=template-description style=padding: 0 1.5em; border: 1px solid #eeeeee; background-color: #f9f9f9

Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环：模板:Parameter/nowiki/pre 检查到模板循环：模板:Parameter

The usage of this template is below: prenowiki检查到模板循环：模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

wordpress.org.cn /div /noinclude

tt$function_to_add/tt
(callback) (参数必需) 动作触发时，被调用函数的名字。 注释：在PHP文档中 'callback' 类型的语法解释是有效的。
Default: 没有默认值noinclude

div class=template-description style=padding: 0 1.5em; border: 1px solid #eeeeee; background-color: #f9f9f9

Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环：模板:Parameter/nowiki/pre 检查到模板循环：模板:Parameter

The usage of this template is below: prenowiki检查到模板循环：模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

wordpress.org.cn /div /noinclude

tt$priority/tt
(int) (参数可选) 函数的优先级。改变这个值可以让您的函数在其他函数之前执行，或者是之后执行。默认值为10，例如把这个值设置为5将更早的被执行，设置为12将会晚一些执行。也就是小的值被优先执行。
Default: 10noinclude

div class=template-description style=padding: 0 1.5em; border: 1px solid #eeeeee; background-color: #f9f9f9

Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环：模板:Parameter/nowiki/pre 检查到模板循环：模板:Parameter

The usage of this template is below: prenowiki检查到模板循环：模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

wordpress.org.cn /div /noinclude

tt$accepted_args/tt
(int) (参数可选) 函数参数的个数。在 WordPress 1.5.1+, 当匹配的 do_action() 或apply_filters()运行，钩子函数可以传入格外的参数。例如动作comment_id_not_found可以传入评论的ID。
Default: 1noinclude

div class=template-description style=padding: 0 1.5em; border: 1px solid #eeeeee; background-color: #f9f9f9

Notes

This template is for standardizing how parameters look in the Function Reference and in Template Tags. Here is an example of this template being called: prenowiki检查到模板循环：模板:Parameter/nowiki/pre 检查到模板循环：模板:Parameter

The usage of this template is below: prenowiki检查到模板循环：模板:Parameter/nowiki/pre Let's take a closer look at the parameters..

name
The name of the parameter.
datatype
The datatype that should be given for this parameter when called.
  • string
  • integer
  • boolean
  • mixed
description
A short description of the parameter.
importance
Set this parameter to optional if the parameter is optional. Otherwise, do not declare this parameter—it defaults to required.
  • required
  • optional
default
If this parameter is optional, ttdefault/tt is the value that will be used if the parameter is not declared.

wordpress.org.cn /div /noinclude

示例

Simple Hook

新文章发布时，通过邮件通知好友。 

function email_friends($post_ID)  {
   $friends = 'bob@example.org, susie@example.org';
   mail($friends, "sally's blog updated" , 'I just put something on my blog: http://blog.example.com');
   return $post_ID;
}

add_action('publish_post', 'email_friends');

获取 参数

The hooked function takes one argument from the action. Specifically, the 'echo_comment_id' function, takes the argument $comment_ID. It then echos the value of the received argument. 

function echo_comment_id($comment_ID) {
   echo "I just received $comment_ID";
}
add_action('comment_id_not_found','echo_comment_id', 10, 1);

Notes

To find out the number and name of arguments for an action, simply search the code base for the matching do_action() call. For example, if you are hooking into 'save_post', you would find it in post.php: 

do_action('save_post', $post_ID, $post);

Your add_action call would look like: 

add_action('save_post', 'my_save_post', 10, 2);

And your function would be: 

function my_save_post($post_ID, $post){
  //code here
}

Change Log

Since: 1.2.0

Source File

add_action() is located in onlyincludecodewp-includes/plugin.php/code/onlyinclude

div class=template-description style=padding: 0 1.5em; border: 1px solid #eeeeee; background-color: #f9f9f9

Template Description

Link to the source code on http://core.trac.wordpress.org/browser/.

Parameters

  1. filename
  2. (option) path to codetag/code (version) or codetrunk/code. This option is only used for a new function.br /Default: codetrunk/code -- trunk is the latest bleeding edge development version of WordPress.

Usage

Link to the stable version: pre检查到模板循环：模板:Trac/pre

Link to trunk: pre检查到模板循环：模板:Trac/pre

/div

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相关

Actions: has_action, add_action, do_action, do_action_ref_array, did_action, remove_action, remove_all_actions

includeonlydiv style=clear:both; background-color:#F7F7F7; border:1px solid #CCCCCC; color:#000000; padding:7px; margin:0.5em auto 0.5em auto; vertical-align:middle;See also index of Function Reference and index of Template Tags./div/includeonlynoinclude

Description

This Template is used by Codex:Template Messages.

Usage

pre 检查到模板循环：模板:Message /pre

Result

检查到模板循环：模板:Message

/noinclude

includeonlydiv style=clear:both; background-color:#EEEEFF; border:1px solid #CCCCCC; color:#000000; padding:7px; margin:0.5em auto 0.5em auto; vertical-align:middle;This article is marked as in need of editing. You can help Codex by editing it./div/includeonlynoinclude

Description

This Template is used by Codex:Template Messages.

Usage

pre 检查到模板循环：模板:Message /pre

Result

检查到模板循环：模板:Message

/noinclude

取自“http://codex.wordpress.org.cn/index.php?title=函数参考/add_action&oldid=165585”