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Homephp教程php手册浅析PHP中call user func()函数及如何使用call user func调用自定义函数

使用call_user_func函数,通过传入字符串函数,可以调用自定义函数,并且支持引用。该函数允许用户调用直接写的函数并传入一定的参数,下面总结下这个函数的使用

UCenter源代码里有一个函数call_user_func,开始以为是自己定义的函数,结果到处都找不到。后来才知道call_user_func是PHP的内置函数,该函数允许用户调用直接写的函数并传入一定的参数,下面总结下这个函数的使用方法。

call_user_func函数类似于一种特别的调用函数的方法,使用方法如下:

调用类内部的方法比较奇怪,居然用的是array,不知道开发者是如何考虑的,当然省去了new,也挺有新意的:

call_user_func_array函数和call_user_func很相似,只不过是换了一种方式传递了参数,让参数的结构更清晰:

call_user_func_array函数也可以调用类内部的方法的:

call_user_func函数和call_user_func_array函数都支持引用,这让他们和普通的函数调用更趋于功能一致:

另外,call_user_func函数和call_user_func_array函数都支持引用。 view sourceprint?

下面给大家介绍使用call_user_func调用自定义函数

使用call_user_func函数,通过传入字符串函数,可以调用自定义函数,并且支持引用。

1.mixed call_user_func ( callable $callback [, mixed $parameter [, mixed $... ]] )

调用第一个参数提供的自定义函数,后面的参数为自定义函数的参数,返回自定义函数的结果

function say($word) { echo $word; } call_user_func('say', 'hello world'); //hello world 当然也可以调用类中的方法: class A { function say($word = '') { echo $word; } } $a = new A(); //注意,必须是要实例化的,除非是static call_user_func(array($a, 'say'), 'hello world'); //hello world

2.mixed call_user_func_array ( callable $callback , array $param_arr )

话说call_user_func_array和call_user_func函数功能一样,只是调用参数时有点区别:

function a($word) { echo $word; } class A { function say($word = '') { echo $word; } } call_user_func_array('a', array('hello world')); //hello world $a = new A(); //注意,必须是要实例化的,除非是static call_user_func_array(array($a, 'say'), array('hello world')); //hello world

注明:另外类似的两个函数是call_user_method 和call_user_method_array() 不过在PHP4.1后就停用废弃了

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