PHP中$_SERVER全局变量的使用

<!DOCTYPE html>
<html>
<body>

<?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'];
?>

</body>
</html>
输出
/example/php/demo_php_global_server.php
www.w3school.com.cn
www.w3school.com.cn
https://www.w3school.com.cn/tiy/s.asp?f=demo_php_global_server
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0
/example/php/demo_php_global_server.php

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