PHPÃæÊÔ³£ÓÃËã·¨(ÍƼö)

Ò»¡¢Ã°ÅÝÅÅÐo

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¶ÔÐeÒªÅÅÐoµÄÊý×e´ÓºoÍuÇ°£¨ÄaeÐo£(C)½øÐжa±eµÄɨÃe£¬µ±*¢ÏÖÏaÁÚµÄÁ½¸oÊýÖµµÄ´ÎÐoÓeÅÅÐoÒªÇoµÄ¹aeÔo²»Ò»ÖÂʱ£¬¾Í½«ÕaÁ½¸oÊýÖµ½øÐн»»»¡£ÕaÑu±È½ÏС£¨´o£(C)µÄÊýÖµ¾Í½«Öð½¥´ÓºoÃaeÏoÇ°ÃaeÒƶ¯¡£

//ðÅÝÅÅÐo

    <?php

      function mysort($arr)
      {
        for($i = 0; $i < count($arr); $i++)
        {
          $isSort = false;
          for ($j=0; $j< count($arr) - $i - 1; $j++) 
          {
            if($arr[$j] < $arr[$j+1])
            {
              $isSort = true;
              $temp = $arr[$j];
              $arr[$j] = $arr[$j+1];
              $arr[$j+1] = $temp ;
            }
          }
          if($isSort)
          {
            break;
          }
        }
        return $arr;
      }

      $arr = array(3,1,2);
      var_dump(mysort($arr));
    ?>

¶þ¡¢¿iËÙÅÅÐo

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ÔÚÊý×eÖÐÌo³oÒ»¸oÔªËØ£¨¶aΪµÚÒ»¸o£(C)×÷Ϊ±e³ß£¬É¨ÃeÒ»±eÊý×e½«±È±e³ßСµÄÔªËØÅÅÔÚ±e³ß֮ǰ£¬½«ËuÓбȱe³ß´oµÄÔªËØÅÅÔÚ±e³ßÖ®ºo£¬Í¨¹ýµÝ¹e½«¸÷×ÓÐoÁÐÖ±ð»®ÖΪ¸uСµÄÐoÁÐÖ±µ½ËuÓеÄÐoÁÐ˳ÐoÒ»Ö¡£

//¿iËÙÅÅÐo

    <?php
      //¿iËÙÅÅÐo
        function quick_sort($arr) 
        {
          //ÏÈÅжÏÊÇ*ñÐeÒª¼ÌÐø½øÐÐ
          $length = count($arr);
          if($length <= 1) 
          {
            return $arr;
          }

          $base_num = $arr[0];//Ñ¡ÔñÒ»¸o±e³ß Ñ¡ÔñµÚÒ»¸oÔªËØ

          //³oʼ»¯Á½¸oÊý×e
          $left_array = array();//СÓÚ±e³ßµÄ
          $right_array = array();//´oÓÚ±e³ßµÄ
          for($i=1; $i<$length; $i++) 
          {      //±eÀu ³ýÁ˱e³ßÍaµÄËuÓÐÔªËØ£¬°´ÕÕ´oС¹Øϵ*ÅÈeÁ½¸oÊý×eÄÚ
            if($base_num > $arr[$i]) 
            {
              //*ÅÈe×o±ßÊý×e
              $left_array[] = $arr[$i];
            } 
            else 
            {
              //*ÅÈeÓÒ±ß
              $right_array[] = $arr[$i];
            }
          }
          //ÔÙ*Ö±ð¶Ô ×o±ß ºÍ ÓұߵÄÊý×e½øÐÐÏaͬµÄÅÅÐo´¦Ài*½Ê½
          //µÝ¹eµ÷ÓÃÕa¸oº¯Êý,²¢¼Ç¼½a¹u
          $left_array = quick_sort($left_array);
          $right_array = quick_sort($right_array);
          //ºÏ²¢×o±ß ±e³ß ÓÒ±ß
          return array_merge($left_array, array($base_num), $right_array);
        }

        $arr = array(3,1,2);
        var_dump(quick_sort($arr));

    ?>

*Èý¡¢¶þÖ²eÕÒ**

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¼ÙÉeÊý¾ÝÊÇ°´ÉýÐoÅÅÐoµÄ£¬¶ÔÓÚ¸ø¶¨Öµx£¬´ÓÐoÁеÄÖмaλÖÿªÊ¼±È½Ï£¬Èç¹uµ±Ç°Î»ÖÃÖµµÈÓÚx£¬Ôo²eÕҳɹ¦£»ÈoxСÓÚµ±Ç°Î»ÖÃÖµ£¬ÔoÔÚÊýÁеÄÇ°°e¶ÎÖвeÕÒ£»Èox´oÓÚµ±Ç°Î»ÖÃÖµÔoÔÚÊýÁеĺo°e¶ÎÖмÌÐø²eÕÒ£¬Ö±µ½ÕÒµ½ÎªÖ¹¡££¨Êý¾ÝÁ¿´oµÄʱºoʹÓã(C)

//¶þ*Ö²eÕÒ

    <?php
      //¶þ*Ö²eÕÒ
      function bin_search($arr,$low,$high,$k)
      {
        if($low <= $high)
        {
          $mid = intval(($low + $high)/2);
          if($arr[$mid] == $k)
          {
            return $mid;
          }
          else if($k < $arr[$mid])
          {
            return bin_search($arr,$low,$mid-1,$k);
          }
          else
          {
            return bin_search($arr,$mid+1,$high,$k);
          }
        }
        return -1;
      }

      $arr = array(1,2,3,4,5,6,7,8,9,10);

      print(bin_search($arr,0,9,3));
    ?>

ËÄ¡¢Ë³Ðo²eÕÒ

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´ÓÊý×eµÄµÚÒ»¸oÔªËØ¿ªÊ¼Ò»¸oÒ»¸oÏoϲeÕÒ£¬Èç¹uÓкÍÄ¿±eÒ»ÖµÄÔªËØ£¬²eÕҳɹ¦£»Èç¹uµ½×iºoÒ»¸oÔªËØÈÔûÓÐÄ¿±eÔªËØ£¬Ôo²eÕÒʧ°Ü¡£

//˳Ðo²eÕÒ¡¡

    <?php
      //˳Ðo²eÕÒ
      function seq_search($arr,$n,$k)
      {
        $array[$n] = $k;
        for($i = 0;$i < $n; $i++)
        {
          if($arr[$i] == $k)
          {
            break;
          }
        }

        if($i < $n)
        {
          return $i;
        }
        else
        {
          return -1;
        }
      }
    ?>

Îa¡¢Ð´Ò»¸oº¯Êý£¬Äܹ»±eÀuÒ»¸oÎļþϵÄËuÓÐÎļþºÍ×ÓÎļþ¼Ð

    <?php  
      function my_scandir($dir)
      {
        $files = array();
        if($handle = opendir($dir))
        {
          while (($file = readdir($handle))!== false) 
          {
            if($file != '..' && $file != '.')
            {
              if(is_dir($dir."/".$file))
              {
                $files[$file]=my_scandir($dir."/".$file);
              }
              else
              {
                $files[] = $file;
              }
            }
          }

          closedir($handle);
          return $files;
        }
      }

      var_dump(my_scandir('../'));
    ?>

Áu¡¢Ð´Ò»¸oº¯Êý£¬¾¡¿ÉÄܸßЧµÄ´ÓÒ»¸o±e×¼urlÖÐÈ¡³oÎļþµÄÀ(C)Õ¹Ãu

    <?php
      function getExt($url)
      {
        $arr = parse_url($url);//parse_url½aÎoÒ»¸o URL ²¢*µ»ØÒ»¸o¹ØÁªÊý×e£¬°uº¬ÔÚ URL ÖгoÏֵĸ÷ÖÖ×e³É²¿*Ö
        //'scheme' => string 'http' (length=4)
        //'host' => string 'www.sina.com.cn' (length=15)
        //'path' => string '/abc/de/fg.php' (length=14)
        //'query' => string 'id=1' (length=4)
        $file = basename($arr['path']);// basenameº¯Êý*µ»ØÂ*¾¶ÖеÄÎļþÃu²¿*Ö
        $ext = explode('.', $file);
        return $ext[count($ext)-1];
      }

      print(getExt('http://www.sina.com.cn/abc/de/fg.html.php?id=1'));

    ?>

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