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<?php
/**
 * 功   能：fsockopen操作类，实现了简单的post和get方法
 * usage:
 * //fsocketOper::$header = true;  //开启只返回header头
 * $data = fsocketOper::Http_get( $posturl ); //get方法
 * $data = fsocketOper::Http_post( $posturl , array ( 'one' => 1 ) ); //post方法
 * var_dump( $data );
 */
class fsocketOper
{
    public static $header = FALSE; //true则返回header头，不返回实体数据
    /**
     * 功  能：模拟get请求
     *
     * @param $url 抓取页面的url
     *
     * @return string   页面内容
     */
    public static function Http_get( $url )
    {
        //解析url
        $url       = parse_url( $url );
        $port      = isset( $url[ 'port' ] ) ? $url[ 'port' ] : 80;
        $path      = isset( $url[ 'path' ] ) ? $url[ 'path' ] : 'index.php';
        $queryData = isset( $url[ 'query' ] ) ? $url[ 'query' ] : '';
        //请求数据整合
        $query = $path . "?" . $queryData;

        $fp = fsockopen( $url[ 'host' ] , $port , $errno , $errstr );
        if ( !$fp )
        {
            return $errstr . '(' . $errno . ')';
        }
        else
        {
            $request = "GET $query HTTP/1.1\r\n";
            $request .= "Host: $url[host]\r\n";
            $request .= "Connection: Close\r\n";
            $request .= "\r\n";
            fwrite( $fp , $request );
            $result = '';
            while ( !feof( $fp ) )
            {
                $result .= @fgets( $fp , 1024 );
            }
            fclose( $fp );

            return self::getContents( $result );
        }
    }

    /**
     * 功  能：模拟post请求
     *
     * @param        $URL
     * @param array  $Postdata
     * @param string $referer
     *
     * @return string
     */
    public static function HTTP_post( $URL , array $Postdata , $referer = "" )
    {
        //解析url
        $URL_Info = parse_url( $URL );
        if ( !isset( $URL_Info[ "port" ] ) )
        {
            $URL_Info[ "port" ] = 80;
        }

        //设置post来源
        if ( $referer == "" )
        {
            $referer = 'index.php';
        }
        //拼接post数据
        foreach ( $Postdata as $key => $value )
        {
            $values[ ] = "$key=" . urlencode( $value );
        }
        $data_string = implode( "&" , $values );
        //请求数据整合
        $request = '';
        $request .= "POST " . $URL_Info[ "path" ] . " HTTP/1.1\r\n";
        $request .= "Host: " . $URL_Info[ "host" ] . "\r\n";
        $request .= "Referer: $referer\r\n";
        $request .= "Content-type: application/x-www-form-urlencoded\r\n"; //post
        $request .= "Content-length: " . strlen( $data_string ) . "\r\n"; //发送post数据的长度
        $request .= "Connection: close\r\n";
        $request .= "\r\n";
        $request .= $data_string . "\r\n";

        $fp = fsockopen( $URL_Info[ "host" ] , $URL_Info[ "port" ] , $errno , $errstr );
        if ( !$fp )
        {
            return $errstr . '(' . $errno . ')';
        }
        fputs( $fp , $request );
        $result = '';
        while ( !feof( $fp ) )
        {
            $result .= fgets( $fp , 1024 );
        }
        fclose( $fp );

        return self::getContents( $result );
    }

    /**
     * 功   能：处理得到的数据
     * @param $contents 有header的string
     *
     * @return string
     */
    private static function getContents( $contents )
    {
        if ( self::$header )
        { //获得header信息
            $pos    = stripos( $contents , "\r\n\r\n" );
            $header = substr( $contents , 0 , $pos );

            return $header;
        }
        else
        { //获得body信息
            $body = stristr( $contents , "\r\n\r\n" );
            $body = substr( $body , 4 , strlen( $body ) );

            return $body;
        }

    }

}