使用PHP读取远程文件

使用php读取远程文件有4种方式：

fopen()
file_get_contents()
curl函数
socket函数
fopen()与file_get_contents()需要在php.ini配置文件中激活allow_url_fopen选项。

fopen()方式

$handle = fopen ("http://www.example.com/", "rb");
$contents = "";
while (!feof($handle)) {
$contents .= fread($handle, 8192);
}
fclose($handle);
file_get_contents()方式

$contents = file_get_contents('http://www.example.com/');
curl函数

if (function_exists('curl_init')){
$ch=curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.example.com');
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows; U; Windows NT 5.1; )');
$content=curl_ex ec($ch);
curl_close($ch);
}
socket方式

function getRemoteFile($url)
{
$parsedUrl = parse_url($url);
$host = $parsedUrl['host'];
if (isset($parsedUrl['path'])) {
$path = $parsedUrl['path'];
} else {
$path = '/';
}

if (isset($parsedUrl['query'])) {
$path .= '?' . $parsedUrl['query'];
}

if (isset($parsedUrl['port'])) {
$port = $parsedUrl['port'];
} else {
$port = '80';
}

$timeout = 10;
$response = '';
$fp = @fsockopen($host, '80', $errno, $errstr, $timeout );
if( !$fp ) {
echo "连接$url失败";
} else {
fputs($fp, "GET $path HTTP/1.0\r\n" .
"Host: $host\r\n" .
"User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1;) \r\n" .
"Accept: */*\r\n" .
"Accept-Language: zh-CN,zh;q=0.5\r\n" .
"Accept-Charset: GB-2312,utf-8;q=0.7,*;q=0.7\r\n" .
"Keep-Alive: 300\r\n" .
"Connection: keep-alive\r\n" .
"Referer: http://$host\r\n\r\n");

while ( $line = fread( $fp, 4096 ) ) {
$response .= $line;
}

fclose( $fp );
$pos = strpos($response, "\r\n\r\n");
$response = substr($response, $pos + 4);
}

return $response;
}