如何在PHP中使用$ this关闭 [英] How to use $this in closure in php

问题描述

我有这样的功能:

class Service {
    function delete_user($username) {   
        ...
        $sessions = $this->config->sessions;
        $this->config->sessions = array_filter($sessions, function($session) use ($this){
            return $this->get_username($session->token) != $username;
        });
    }
}

但是这不起作用，因为您不能在use内使用$this，是否可以在回调内执行Service类的成员函数?还是我需要使用for或foreach循环?

but this don't work because you can't use $this inside use, is it possible to execute function which is member of class Service inside a callback? Or do I need to use for or foreach loop?

推荐答案

$this始终在(非静态)闭包中可用，而无需use.

$this is always available in (non-static) closures since PHP 5.4, no need to use it.

class Service {
    function delete_user($username) {   
        ...
        $sessions = $this->config->sessions;
        $this->config->sessions = array_filter($sessions, function($session) {
            return $this->get_username($session->token) != $username;
        });
    }
}

请参见 PHP手册-匿名函数-自动绑定$ this

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