PHP Curl And Cookies

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You can specify the cookie file with a curl opt. You could use a unique file for each user.

curl_setopt( $curl_handle, CURLOPT_COOKIESESSION, true );
curl_setopt( $curl_handle, CURLOPT_COOKIEJAR, uniquefilename );
curl_setopt( $curl_handle, CURLOPT_COOKIEFILE, uniquefilename );

The best way to handle it would be to stick your request logic into a curl function and just pass the unique file name in as a parameter.

    function fetch( $url, $z=null ) {
            $ch =  curl_init();

            $useragent = isset($z['useragent']) ? $z['useragent'] : 'Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0.2) Gecko/20100101 Firefox/10.0.2';

            curl_setopt( $ch, CURLOPT_URL, $url );
            curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
            curl_setopt( $ch, CURLOPT_AUTOREFERER, true );
            curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, true );
            curl_setopt( $ch, CURLOPT_POST, isset($z['post']) );

            if( isset($z['post']) )         curl_setopt( $ch, CURLOPT_POSTFIELDS, $z['post'] );
            if( isset($z['refer']) )        curl_setopt( $ch, CURLOPT_REFERER, $z['refer'] );

            curl_setopt( $ch, CURLOPT_USERAGENT, $useragent );
            curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, ( isset($z['timeout']) ? $z['timeout'] : 5 ) );
            curl_setopt( $ch, CURLOPT_COOKIEJAR,  $z['cookiefile'] );
            curl_setopt( $ch, CURLOPT_COOKIEFILE, $z['cookiefile'] );

            $result = curl_exec( $ch );
            curl_close( $ch );
            return $result;
    }

I use this for quick grabs. It takes the url and an array of options.

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