What does php $$ mean_PHP Tutorial

foreach(array('_COOKIE', '_POST', '_GET') as $_request) {
foreach($$_request as $_key => $_value) {
                  $_key{0} != '_' && $$_key = daddslashes($_value);
}
}
$_request is a built-in variable in PHP, right? What does $$_request mean

The ones in uppercase letters are PHP’s super global variables
$_REQUEST
In the above code, $_request is a normal variable

$$_request means to use the value of $_request as the variable name!
For example:

<font face="新宋体">$name = 'blueidea';<code id="code0"><font face="新宋体">$name = 'blueidea';<br> $$name 就相当于  $blueidea</font> $$name is equivalent to $blueidea

http://www.bkjia.com/PHPjc/632476.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632476.htmlTechArticleforeach(array('_COOKIE', '_POST', '_GET') as $_request) { foreach($ $_request as $_key = $_value) { $_key{0} != '_' $$_key = daddslashes($_value); } } $_request is a built-in variable of PHP...