php中全局變量列表:
$GLOBALS $_SERVER $_REQUEST $_POST $_GET $_FILES $_ENV $_COOKIE $_SESSION
1、$GLOBALS可將$GLOBALS['a']中php變量a轉化成全局變量!
例如:
<?php $x = 75; $y = 25; function addition() { $GLOBALS['z'] = $GLOBALS['x'] + $GLOBALS['y']; } addition(); echo $z; ?>
2、$_SERVER 這種超全局變量保存關於報頭、路徑和腳本位置的信息。
例如:
<?php echo $_SERVER['PHP_SELF']; echo "<br>"; echo $_SERVER['SERVER_NAME']; echo "<br>"; echo $_SERVER['HTTP_HOST']; echo "<br>"; echo $_SERVER['HTTP_REFERER']; echo "<br>"; echo $_SERVER['HTTP_USER_AGENT']; echo "<br>"; echo $_SERVER['SCRIPT_NAME']; ?>
3、PHP $_REQUEST 用於收集 HTML 表單提交的數據。用法同$_GET和$_POST一模一樣;