php curl判断一个远程文件在不在

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<?php$url2 ="http://www.XXX.com/9g.jpg";$ch = curl_init(); $timeout = 10; curl_setopt ($ch, CURLOPT_URL, $url2); curl_setopt($ch, CURLOPT_HEADER, 1); curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $contents = curl_exec($ch);$contents = substr($contents,0,30);if (preg_match("/404/", $contents)){echo '不存在';}?>

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