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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