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    <?php
    header("content-type:text/html;charset=utf-8");
    /**
      strrev() º¯Êý*´×ª×Ö*u´®¡£
      Ói*¨
      strrev(string)
      ²ÎÊý ÃeÊo
      string ±ØÐe¡£¹ae¶¨Òª*´×ªµÄ×Ö*u´®¡£
     */

    /**
    ´Ëº¯ÊýµÄ×÷ÓÃÊÇ*´×ªÖÐÎÄ×Ö*u´®
    mb_strlen() »ñÈ¡×Ö*uµÄ³¤¶È
    mb_substr() »ñÈ¡×Ö*uµÄµ¥¸oÔªËØ
    krsort() °´ÕÕ¼uÖµÄaeÐoÅÅÐoÊý×e,¶Ô¹ØÁªÊý×e°´ÕÕ¼uÃu½øÐнµÐoÅÅÐo
    Array ( [8] => ¹u [7] => ÖÐ [6] => h [5] => s [4] => i [3] => l [2] => g [1] => n [0] => E ) EnglishÖйu->¹uÖÐhsilgnE
    (ksort()¶Ô¹ØÁªÊý×e°´ÕÕ¼uÃu½øÐÐÉýÐoÅÅÐo)
    implode() ½«Êý×eÆ´½ÓΪ×Ö*u´®
    explode() ʹÓÃ×Ö*u´®*Ö¸o×Ö*u´®
     */
    function str_rev_gb($str){
      //ÅжÏÊaÈeµÄÊDz»ÊÇutf8ÀaÐ͵Ä×Ö*u£¬*ñÔoÍ˳o
      if(!is_string($str)||!mb_check_encoding($str,'UTF-8')){
        exit("ÊaÈeÀaÐͲ»ÊÇUTF8ÀaÐ͵Ä×Ö*u´®");
      }
      $array=array();
      //½«×Ö*u´®´aeÈeÊý×e
      $l=mb_strlen($str,'UTF-8');//ÔÚmb_strlen¼ÆËaʱ£¬Ñ¡¶¨ÄÚÂeΪUTF8£¬Ôo»a½«Ò»¸oÖÐÎÄ×Ö*uµ±×÷³¤¶È1À´¼ÆËa
      for($i=0;$i<$l;$i++){
        $array[]=mb_substr($str,$i,1,'UTF-8');
      }
      //*´×ª×Ö*u´®
      krsort($array);
      //Æ´½Ó×Ö*u´®
      $string=implode($array);
      return $string;
    }
    $str1 = "Englist";
    $str2 = "EnglishÖйu";
    $str3 = "EngÖÐlish¹u";
    $str4 = "ÖлªÈËÃñ¹²ºÍ¹u";
    echo 'Ö±½ÓÓÃPHP×Ô´østrrevº¯Êý*´×ª£º'.'<br />';
    echo $str1."->".strrev($str1)."<br>";
    echo $str2."->".strrev($str2)."<br>";
    echo $str3."->".strrev($str3)."<br>";
    echo $str4."->".strrev($str4)."<br>";
    echo '<br />';
    echo $str1."->".str_rev_gb($str1)."<br>";
    echo $str2."->".str_rev_gb($str2)."<br>";
    echo $str3."->".str_rev_gb($str3)."<br>";
    echo $str4."->".str_rev_gb($str4)."<br>";

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Ö±½ÓÓÃPHP×Ô´østrrevº¯Êý*´×ª£º
Englist->tsilgnE
EnglishÖйu->��ŒW�hsilgnE
EngÖÐlish¹u->���hsil���gnE
ÖлªÈËÃñ¹²ºÍ¹u->��…A¾Ó…eÄç䎍ŒW�

Englist->tsilgnE
EnglishÖйu->¹uÖÐhsilgnE
EngÖÐlish¹u->¹uhsilÖÐgnE
ÖлªÈËÃñ¹²ºÍ¹u->¹uºÍ¹²ÃñÈË»ªÖÐ

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