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php可变变量语法

可变变量意思是变量名是变量构成的,一般有两种方法:

方法一:直接在变量值前加美元符号$构成可变变量名:

$ex='test';            //一般变量
$$ex='var';            //获得可变变量$test,赋值为'var'
$$$ex='three layer';   //获得可变变量$var,赋值为'three layer'

方法二:使用大括号获取复杂可变变量名:

$ex=array('a','B','C');
${'ex_'.strtolower($arr[0])}='a';        //获得可变变量$ex_a
${'ex_'.strtolower($arr[1])}[0]='b';     //获得可变数组变量$ex_b,并赋值$ex_b[0]='b';
//获得可变变量$exex_b,并赋值为'c'
${'exex_'.${'ex_'.strtolower($arr[1])}[0]}='c';
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