สวัสดีคะ สอบถามเรื่องการเข้ารหัสข้อความแบบ Hex คะ ต้องการเอาข้อความชุดนึงมาเข้ารหัสและถอดรหัสออกมา ต้องทำยังไงคะ ใครรู้บ้าง สอนหน่อยคะ

<?php
   function uniord($uchr) {
       $k = mb_convert_encoding($uchr, 'UCS-2LE', 'UTF-8');
       $k1 = ord(substr($k, 0, 1));
       $k2 = ord(substr($k, 1, 1));
	
       return $k2 * 256 + $k1;
   }

   function unichr($intval) {
       return mb_convert_encoding(pack('n', $intval), 'UTF-8', 'UTF-16BE');
   }
?>

<?php
   $uni_chr = 'ผ';	
   echo "Unicode Charector: $uni_chr<br /><br />";	
				
   $en_dec = uniord($unicode_chr);		
   echo "Encode to Decimal: $en_dec<br />";		
				
   $en_hex = str_pad(strtoupper(dechex($en_dec)), 4, "0", STR_PAD_LEFT); // padding zero				
   echo "Encode to Hexadecimal: $en_hex<br /><br />";
				
   $de_dec = hexdec($en_hex);
   echo "Decode to Decimal: $en_dec<br />";
				
   $de_uni = unichr($de_dec);
   echo "Decode to Unicode Charector: $de_uni<br />";
?>	

	header('Content-Type: text/html; charset=utf-8');
	
	function uniord($uchr) {
		$k = mb_convert_encoding($uchr, 'UCS-2LE', 'UTF-8');
		$k1 = ord(substr($k, 0, 1));
		$k2 = ord(substr($k, 1, 1));
		
		return $k2 * 256 + $k1;
	}

	function unichr($intval) {
		return mb_convert_encoding(pack('n', $intval), 'UTF-8', 'UTF-16BE');
	}

	$uni_chr = 'ผ';	
	echo "Unicode Charector: $uni_chr<br /><br />";	

	$en_dec = uniord($uni_chr);		
	echo "Encode to Decimal: $en_dec<br />";		

	$en_hex = str_pad(strtoupper(dechex($en_dec)), 4, '0', STR_PAD_LEFT);				
	echo "Encode to Hexadecimal: $en_hex<br /><br />";

	$de_dec = hexdec($en_hex);
	echo "Decode to Decimal: $en_dec<br />";

	$de_uni = unichr($de_dec);
	echo "Decode to Unicode Charector: $de_uni<br />";	

<?
//header('Content-Type: text/html; charset=utf-8');

function uniord($uchr) {
	$k = mb_convert_encoding($uchr, 'UCS-2LE', 'UTF-8');
	$k1 = ord(substr($k, 0, 1));
	$k2 = ord(substr($k, 1, 1));
	
	return $k2 * 256 + $k1;
}

function unichr($intval) {
	return mb_convert_encoding(pack('n', $intval), 'UTF-8', 'UTF-16BE');
}

$uni_chr = 'ด';	
echo "Unicode Charector: $uni_chr<br /><br />";	

$en_dec = uniord($uni_chr);		
echo "Encode to Decimal: $en_dec<br />";		

$en_hex = str_pad(strtoupper(dechex($en_dec)), 4, '0', STR_PAD_LEFT);				
echo "Encode to Hexadecimal: $en_hex<br /><br />";

$de_dec = hexdec($en_hex);
echo "Decode to Decimal: $en_dec<br />";

$de_uni = unichr($de_dec);
echo "Decode to Unicode Charector: $de_uni<br />";	
?>

<?php
	header('Content-Type: text/html; charset=utf-8');
	
	function uniord($uchr) {
		$k = mb_convert_encoding($uchr, 'UCS-2LE', 'UTF-8');
		$k1 = ord(substr($k, 0, 1));
		$k2 = ord(substr($k, 1, 1));
		
		return $k2 * 256 + $k1;
	}

	function unichr($intval) {
		return mb_convert_encoding(pack('n', $intval), 'UTF-8', 'UTF-16BE');
	}
	
	function encode($str) {
		$input = preg_split('//u', $str, -1, PREG_SPLIT_NO_EMPTY);
		$encode = '';
		
		foreach ($input as &$chr) {
			$en_dec = uniord($chr);	
			$en_hex = str_pad(strtoupper(dechex($en_dec)), 4, '0', STR_PAD_LEFT);	
			
			$encode .= $en_hex;
		}
		
		return $encode;
	}
	
	function decode($str) {
		$decode = '';
		
		for ($i = 0; $i < strlen($str) / 4; $i++) {
			$en_hex = substr($str, $i * 4, 4);
			$de_dec = hexdec($en_hex);
			$de_uni = unichr($de_dec);
			
			$decode .= $de_uni;
		}
		
		return $decode;
	}
	
	//----------------------------------------------------------------
	$str = 'ผู้จัดการสวนสนุก พร้อมชดใช้ค่าเสียหาย กรณีเครื่องเล่น จีแม็ก รีเวิร์ส';
	echo "Input: $str<br />";
	echo '<br />';
	
	$encode = encode($str);
	echo "<span style=\"word-wrap:break-word;\">Encode: $encode</span><br />";
	echo '<br />';
	
	$decode = decode($encode);
	echo "Decode: $decode<br />";
	echo '<br />';
?>