php中在变量前面再加个$是什么意思？
比如$($_request)？？谢谢
推荐回答（3个）
$是php的变量标识符,你兴的这种情况，如果:
$request='abc';
$($_request)这种写法php不支持;
应该是:
$var1 ='abc';
$$var1 ='def';
echo $abc; /**变量abc的值是def**/
这种就是php中的可变变量
$_request和$_Post一样是php自带的全局变量，$($_request）估计是将$_request的值做新的变量，不过我不知道这样做有什么用以。
这就是PHP变量的命名规则的一条,变量都要以$这个开头
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