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<?php
$b = array(1,1,2,3,5,8);
$arr = get_defined_vars();
// 打印 $b
print_r($arr["b"]);
// 打印 PHP 解释程序的路径（如果 PHP 作为 CGI 使用的话）
// 例如：/usr/local/bin/php
echo $arr["_"];
// 打印命令行参数（如果有的话）
print_r($arr["argv"]);
// 打印所有服务器变量
print_r($arr["_SERVER"]);
// 打印变量数组的所有可用键值
print_r(array_keys(get_defined_vars()));
?>
 
 
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