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php中如何调用用户自定义的函数(实例详解)

Jun 13, 2016 am 09:28 AM
php Custom function transfer

以下是对php中调用用户自定义函数的方法进行了详细的分析介绍,需要的朋友可以过来参考下

先放上来别人的例子吧:

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:   

代码如下:

function a($b,$c)    
{    
echo $b;    
echo $c;    
}    
call_user_func('a', "111","222");    
call_user_func('a', "333","444");    
//显示 111 222 333 444    
?>
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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,也是满有新意的:

代码如下:

class a {    
function b($c)    
{    
echo $c;    
}    
}    
call_user_func(array("a", "b"),"111");    
//显示 111    
?>
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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:

代码如下:

function a($b, $c)    
{    
echo $b;    
echo $c;    
}    
call_user_func_array('a', array("111", "222"));    
//显示 111 222    
?>
Copy after login

call_user_func_array函数也可以调用类内部的方法的

代码如下:

Class ClassA    
{    
function bc($b, $c) {    
     $bc = $b + $c;    
echo $bc;    
}    
}    
call_user_func_array(array('ClassA','bc'), array("111", "222"));    
//显示 333    
?>
Copy after login

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:

代码如下:

function a($b)    
{    
$b++;    
}    
$c = 0;    
call_user_func('a', $c);    
echo $c;//显示 1    
call_user_func_array('a', array($c));    
echo $c;//显示 2
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另:call_user_func函数和call_user_func_array函数都支持引用。

代码如下:

<?php
function increment(&$var)
{
    $var++;
}
$a = 0;
call_user_func(&#39;increment&#39;, $a);
echo $a; // 0
call_user_func_array(&#39;increment&#39;, array(&$a)); // You can use this instead
echo $a; // 1
?>
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