PHP判断远程/网络文件是否存在实例总结-PHP源码

$url = “http://www.111cn.net”;
$fileExists = @file_get_contents($url, null, null, -1, 1) ? true : false;
echo $fileExists; //返回1，就说明文件存在。
?>

//php判断远程文件是否存在
function url_exists($url){
$handle=curl_init($url);
if(false===$handle){
return false;
}
curl_setopt($handle,CURLOPT_HEADER,false);
curl_setopt($handle,CURLOPT_FAILONERROR,true);
curl_setopt($handle,CURLOPT_NOBODY,true);
curl_setopt($handle,CURLOPT_RETURNTRANSFER,false);
$cOnnectable=curl_exec($handle);

curl_close($handle);
return $connectable;
}

function file_exists($url) {
$curl = curl_init($url);
// 不取回数据
curl_setopt($curl, CURLOPT_NOBODY, true);
// 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
}

$url = "http://www.111cn.net";

$info = parse_url($url);
$fp = fsockopen($info['host'], 80,$errno, $errstr, 30);
fputs($fp,"GET {$info['path']} HTTP/1.1rn");
fputs($fp, "Host: {$info['host']}rn");
fputs($fp, "Connection: closernrn");
$headers = array();
while(!feof($fp)) {
$line = fgets($fp);
if($line != "rn") {
$headers[] = $line;
}else {
break;
}
}

echo "

"; 

    print_r($headers);

$url = 'http://www.111cn.net';

if( @fopen( $url, 'r' ) )
{
echo 'File Exits';
}
else
{
echo 'File Do Not Exits';
}
?>