php curl_init curl 消息头和消息体
给定一个 远程图片地址(http地址) 然后用curl 请求 通过检查返回的 消息头 判断远程图片是否存在
但是这里有个严重的效率问题就是消息体
消息体把图片也给返回了 有设置可以 只产生消息体 让消息体为空或者或不产生消息体吗
<code>//检查远程文件 function checkRemoteFile($file_name, $path) { $path = $path . "/" . $file_name; $ch = curl_init(); $timeout = 30; //在尝试连接时等待的秒数。设置为0,则无限等待。 curl_setopt($ch, CURLOPT_URL, $path); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $contents = curl_exec($ch); //echo $contents; if (preg_match("/404/", $contents)) { echo '0'; return false; } elseif(preg_match("/200/", $contents)) { echo $contents; return true; } } </code>
回复内容:
给定一个 远程图片地址(http地址) 然后用curl 请求 通过检查返回的 消息头 判断远程图片是否存在
但是这里有个严重的效率问题就是消息体
消息体把图片也给返回了 有设置可以 只产生消息体 让消息体为空或者或不产生消息体吗
<code>//检查远程文件 function checkRemoteFile($file_name, $path) { $path = $path . "/" . $file_name; $ch = curl_init(); $timeout = 30; //在尝试连接时等待的秒数。设置为0,则无限等待。 curl_setopt($ch, CURLOPT_URL, $path); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $contents = curl_exec($ch); //echo $contents; if (preg_match("/404/", $contents)) { echo '0'; return false; } elseif(preg_match("/200/", $contents)) { echo $contents; return true; } } </code>
不用curl不就行了,fopen好像也可以打开远程文件吧。
<code>$hd = fopen($remoteUrl, 'r'); if ($hd === false) die('404') else fclose($hd);</code>
哦,看到你的评论了,用 curl_setopt($ch, CURLOPT_NOBODY, true); 看看
curl不可以吗?你试试这个呢!
<code>public function checkRemoteHttpFileExists($url) { $curl = curl_init($url); // 不取回数据 curl_setopt($curl, CURLOPT_NOBODY, true); curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'GET'); // @curl_setopt($curl, CUROPT_RETURNTRANSFER,1); // 发送请求 $result = @curl_exec($curl); $found = false; // 如果请求没有发送失败 if ($result !== false) { // 再检查http响应码是否为200 $statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE); if ($statusCode == 200) { $found = true; } } curl_close($curl); return $found; }</code>

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