ช่วยหน่อยครับคือ งง มากครับ เราจะใช้ function อารายดี พอดีพึงเขียน PHP ใหม่ครับ

$input="abc def fed cba";
$arr1=explode(" ",$input);
sort($arr1);
$output=implode(",",$arr1);
echo $output;

unction str_split_unicode($str, $l = 0) {
    if ($l > 0) {
        $ret = array();
        $len = mb_strlen($str, "UTF-8");
        for ($i = 0; $i < $len; $i += $l) {
            $ret[] = mb_substr($str, $i, $l, "UTF-8");
        }
        return $ret;
    }
    return preg_split(" ", $str, -1, PREG_SPLIT_NO_EMPTY);
}

$s = "abc def fed cba"; // Mild milk
	$ex = explode(" ",$s);
	foreach ($ex as $val => $value) {
			echo $value,"<br/>";

		print_r(str_split_unicode($value, 3));
	 	echo "<br/>";


		}

<?php 


function str_split_unicode($str, $l = 0) {
    if ($l > 0) {
        $ret = array();
        $len = mb_strlen($str, "UTF-8");
        for ($i = 0; $i < $len; $i += $l) {
            $ret[] = mb_substr($str, $i, $l, "UTF-8");
        }
        return $ret;
    }
    return preg_split(" ", $str, -1, PREG_SPLIT_NO_EMPTY);
}

$s = "abc def fed cba"; // Mild milk
$ex = explode(" ",$s);
sort($ex);
foreach ($ex as $val => $value) {
	echo $value,"<br/>";

	print_r(str_split_unicode($value, 3));
	echo "<br/>";
}

function ordutf8($string, &$offset) {
    $code = ord(substr($string, $offset,1)); 
    if ($code >= 128) {        
        if ($code < 224) $bytesnumber = 2;                
        else if ($code < 240) $bytesnumber = 3;        
        else if ($code < 248) $bytesnumber = 4;   
        $codetemp = $code - 192 - ($bytesnumber > 2 ? 32 : 0) - ($bytesnumber > 3 ? 16 : 0);
        for ($i = 2; $i <= $bytesnumber; $i++) {
            $offset ++;
            $code2 = ord(substr($string, $offset, 1)) - 128;       
            $codetemp = $codetemp*64 + $code2;
        }
        $code = $codetemp;
    }
    $offset += 1;
    if ($offset >= strlen($string)) $offset = -1;
    return $code;
}

	$text="abc def cab fed";
	$ex = explode(" ",$text);
	print_r($ex);
	echo "<br/>";
	$x=0;
	foreach ($ex as $val => $value) {
		echo"<br/>";
		for($i=0;$i<strlen($value);$i++)
		{
				$lang=ord(substr($value,$i,3))."|";
				echo $lang;
				for ($l=0; $l <count($lang) ; $l++) 
				{ 
					$hdlc = ordutf8($lang, $l);
					echo $hdlc."<br/>";
					$in = intval($hdlc);
				}
		}
		echo $in."<br/>";
	}