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PHP 摘引的调用

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Release: 2016-06-13 13:09:54
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PHP 引用的调用
1.function test($arr){}
   echo test(&$arr);
2.function test(&$arr){}
   echo test($arr);
  1和2是一样的效果.

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.

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

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