在 wordpress 中使用 add_action 传递参数！

问题描述

我在 wordpress 开发中有一个很奇怪的问题，

I have a very strange problem in my wordpress development,

在 fucntions.php 我有以下代码

in fucntions.php I have the following code

//mytheme/functions.php
$arg = "HELP ME";
add_action('admin_menu', 'my_function', 10, 1);
do_action('admin_menu',$arg );

function my_function($arg)
{
    echo "the var is:".$arg."<br>";
}

输出是

the var is:HELP ME
the var is:

为什么这个函数重复了 2 次?为什么帮我"这个参数被正确地传递了，而它第二次没有被传递?

Why the function repeated 2 times? Why has the argument "help me" been passed correctly and the 2nd time it havent been passed?

我已经尽力了 2 天，并在很多地方搜索以找到解决方案，但我没有运气.

I have been trying all my best for 2 days and searched in many places to find a solution but I had no luck.

我想做的很简单！我只想使用 add_action 将参数传递给函数?

What I am trying to do is simple! I just want to pass argument to a function using add_action?

推荐答案

像这样使用匿名函数:

function my_function($arg) {
  echo "the var is: $arg<br>";
}
$arg = "HELP ME";
add_action('admin_menu', function() { global $arg; my_function($arg); }, 10);

有关详细信息，请参阅此答案.

See this answer for details.

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