PHP检测链接是否存在的代码实例分享_php实例

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Release: 2016-06-07 17:07:36
Original
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在PHP中,检查某个链接是否存在,有两个方法,一个是使用curl,另外一个是
获得HTTP的header的响应码,如果是200的则是OK,如果是404的话就找不到了,例子如下:

1) 使用get_headers: 
 

 <&#63;php 

$url = "http://www.abc.com/demo.jpg"; 
$headers = @get_headers($url); 
if($headers[0] == 'HTTP/1.1 404 Not Found') 
{ 
 echo "URL not Exists"; 
} 
else 
{ 
 echo "URL Exists"; 
} 
&#63;> 

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get_headers中有第2个参数,是true的话,结果将会是个关联数组

2) 使用CURL

  <&#63;php 
$url = "http://www.domain.com/demo.jpg"; 
$curl = curl_init($url); 
curl_setopt($curl, CURLOPT_NOBODY, true); 
$result = curl_exec($curl); 
if ($result !== false) 
{ 
 $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE); 
 if ($statusCode == 200) 
 { 
 echo "URL Exists" 
 } 

} 
else 
{ 
 echo "URL not Exists"; 
} 
&#63;> 

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  CURLOPT_NOBODY指定了只是建立连接,而不取整个报文的内容

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