在网站后台设计时，有时候因为项目要求，需要获取当前网页的url地址。php中获取url地址，以url中各个参数的方法有很多，那么接下来就来说一说，php中如何获取url地址，以及url中包含的其它参数的方法。
php 获取当前页面的url地址的方法
测试网址
php获取当前网页的网址，需要用到超 全局变量 $_SERVER，所以我们，先来打印一下。
php代码
<?php var_dump($_SERVER); ?>
打印结果：
array(34) {
["QUERY_STRING"]=>
string(4) "id=3"
["PHP_SELF"]=>
string(6) "/c.php"
["HTTP_HOST"]=>
string(13) "feiniaomy.com"
["SERVER_PORT"]=>
string(2) "80"
["REQUEST_METHOD"]=>
string(3) "GET"
["REQUEST_URI"]=>
string(11) "/c.php?id=3"
["REQUEST_SCHEME"]=>
string(4) "http"
.....
}
通过上面的打印结果，可以发现 $_SERVER 超全局变量是一个包含有url地址，url参数，网页的路径等肉容的数组。我们可以像平时操作数组一样，从 $_SERVER 变量中提取所需要的信息
php获取主域名
<?php echo $_SERVER['HTTP_HOST']; ?>
输出结果：
feiniaomy.com
php获取当前页面的网页地址
<?php echo $_SERVER['PHP_SELF']; ?>
输出结果：
/c.php
php获取当前页面url的参数
<?php echo $_SERVER["QUERY_STRING"]; ?>
输出结果：
id=3
php获取端口号
<?php echo $_SERVER["SERVER_PORT"]; ?>
输出结果：80
php获取当页网址的完整的url
上面的示例中，介绍了php获取url中的各个参数的方法，下面的示例是获取当前页面的完整的url地址的自定义函数。
函数代码：
<?php
function GetPageUrl(){
// 判断是否 https
$protocol = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') || $_SERVER['SERVER_PORT'] == 443) ? "https://": "http://";
//组合url
$url = $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
return $url;
}
?>
函数调用方法：
<?php echo GetPageUrl(); ?>
输出结果：
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