如何使用PHP检查URL是外部URL还是内部URL？ [英] How To Check Whether A URL Is External URL or Internal URL With PHP?

问题描述

  foreach（$ html-> find（' a [href！=＃]'）as $ ahref）{
 $ ahrefs ++; 
} 
  

我想做这样的事情：

  foreach（$ html-> find（'a [href！=＃]'）as $ ahref）{
 if（isexternal $ ahref））{
 $ external ++; 
} 
 $ ahrefs ++; 
} 
  

其中isexternal是一个函数

  function isexternal（$ url）{
 // FOO ... 
 
 //测试如果链接是内部/外部
 if（/ * condition is true * /）{
 return true; 
} 
 else {
 return false; 
} 
} 
  

帮助！

解决方案

使用 parse_url 并将主机与您的本地主机进行比较（通常但并不总是与 $ _ SERVER ['HTTP_HOST'] 相同）

  function isexternal（$ url）{
 $ components = parse_url（$ url）; 
 return！empty（$ components ['host']）&& strcasecmp（$ components ['host']，'example.com'）; //空主机将指示url像'/relative.php'
} 
  

Hovewer this将www.example.com和example.com视为不同的主机。如果您希望将所有子域名视为本地链接，那么该函数将会更大一些：

  function isexternal（$ url） {
 $ components = parse_url（$ url）; 
 if（empty（$ components ['host']））return false; //我们将像/relative.php一样将URL视为相对
 if（strcasecmp（$ components ['host']，'example.com'）=== 0）return false; // url主机看起来完全像本地主机
返回strrpos（strtolower（$ components ['host']），'.example.com'）！== strlen（$ components ['host']） -  strlen （ '.example.com的'）; //检查url主机是否是子域
} 
  

I'm getting all ahrefs of a page with this loop:

foreach($html->find('a[href!="#"]') as $ahref) {
    $ahrefs++;
}

I want to do something like this:

foreach($html->find('a[href!="#"]') as $ahref) {
    if(isexternal($ahref)) {
        $external++;
    }
    $ahrefs++;
}

Where isexternal is a function

function isexternal($url) {
    // FOO...

    // Test if link is internal/external
    if(/*condition is true*/) {
        return true;
    }
    else {
        return false;
    }
}

Help!

解决方案

Use parse_url and compare host to your local host (often but not always it's the same as $_SERVER['HTTP_HOST'])

function isexternal($url) {
  $components = parse_url($url);    
  return !empty($components['host']) && strcasecmp($components['host'], 'example.com'); // empty host will indicate url like '/relative.php'
}

Hovewer this will treat www.example.com and example.com as different hosts. If you want all your subdomains to be treated as local links then the function will be somewhat larger:

function isexternal($url) {
  $components = parse_url($url);
  if ( empty($components['host']) ) return false;  // we will treat url like '/relative.php' as relative
  if ( strcasecmp($components['host'], 'example.com') === 0 ) return false; // url host looks exactly like the local host
  return strrpos(strtolower($components['host']), '.example.com') !== strlen($components['host']) - strlen('.example.com'); // check if the url host is a subdomain
}

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