Discussion: How to obtain domain name and domain name IP address with PHP

//Global array
echo $_SERVER["HTTP_HOST"];
//The output will be bbs.it-home.org

The local test will output localhost.

Method 2, use parse_url function;

<?php
$url ="http://bbs.it-home.org/index.php?referer=jbxue.com";
$arr=parse_url($url);
echo "<pre class="brush:php;toolbar:false">";
print_r($arr);
echo "

"; ?>

The output is an array, and the result is:

Array ( [scheme] => http [host] => bbs.it-home.org [path] => /index.php [query] => referer=jbxue.com )

Instructions: Scheme corresponds to the protocol, host corresponds to the domain name, path corresponds to the path of the execution file, and query corresponds to the relevant parameters;

Method 3, using a custom function.

<?php
    $url ="http://bbs.it-home.org/index.php?referer=jbxue.com";
    get_host($url);
    function get_host($url){
        //首先替换掉http://
        $url=Str_replace("http://","",$url);
        //获得去掉http://url的/最先出现的位置
        $position=strpos($url,"/");
        //如果没有斜杠则表明url里面没有参数，直接返回url，
        //否则截取字符串
        if($position==false){
            echo $url;
        }else{
            echo substr($url,0,$position);
        }
    }
?>

Method 4, use php regular expressions.

<?php
    header("Content-type:text/html;charset=utf-8");
    $url ="http://bbs.it-home.org/index.php?referer=jbxue.com";
    $pattern="/(http:\/\/)?(.*)\//";
    if(preg_match($pattern,$url,$arr)){
        echo "匹配成功！";
        echo "匹配结果：".$arr[2];
    }
?>

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