通过串联调用 PHP function

Question

如何通过连接字符串和变量形成 function 名称来调用 PHP function？

这是我正在尝试做的，但它不会工作。 我知道有call_user_func() ，但我试图避免这种情况。

$val = 'user'; //varies, can be active, subscribed, unsubscribed etc.

'fetch_'.$val($val);

function fetch_user($users) {
    echo 'Function was called';
}

Answer 1

将它存储在一个变量中然后执行它是一种可能：

$val = 'user'; //varies, can be active, subscribed, unsubscribed etc.

$function = 'fetch_'.$val;

function fetch_user($users) {
    echo 'Function was called with ' . $users;
}

$function($val);

结果：

Function was called with user