<?php$x = 75;$y = 25;function addition(){ $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y'];}addition();echo $z;?>

提示：

Notice: Undefined index: x in /www/admin/working.php.cn_80/wwwroot/compile.php(20) : eval()'d code on line 6Notice: Undefined index: y in /www/admin/working.php.cn_80/wwwroot/compile.php(20) : eval()'d code on line 6Notice: Undefined variable: z in /www/admin/working.php.cn_80/wwwroot/compile.php(20) : eval()'d code on line 9