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PHP引用的调用方法分析,php引用调用

本文实例讲述了PHP引用的调用方法。分享给大家供大家参考,具体如下:

示例1:

function test($arr){} 
echo test(&$arr); 

示例2:

function test(&$arr){} 
echo test($arr); 

示例1和2是一样的效果.

示例3:

function &test($arr){return $result;} 
echo &test($a);//有效 
echo test($a);//返回的是值,不是引用 

总结:只有定义方法时在方法名前加&和调用方法时在方法名前同时加上&时才返回引用.

示例4:

$a=$b; 

当$a与$b都不重新赋值时,即不发生写操作时,与$a=&$b是一样的,即相当于赋引用.

只有当$a或$b都发生变化时才会以拷贝的方式复制一份值赋于$a

希望本文所述对大家PHP程序设计有所帮助。

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