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PHP引用的调用方法分析,php引用调用
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PHP引用的调用方法分析,php引用调用

Jun 13, 2016 am 08:40 AM
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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:

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2

function test($arr){}

echo test(&$arr);

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示例2:

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2

function test(&$arr){}

echo test($arr);

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示例1和2是一样的效果.

示例3:

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2

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function &test($arr){return $result;}

echo &test($a);//有效

echo test($a);//返回的是值,不是引用

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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:

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$a=$b;

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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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