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 1¡¢ÔÚ 33 ¨C 126 ÖÐÉu³ÉÒ»¸oËae»uÕuÊý£¬Èç 35£¬  


2¡¢½« 35 ת»»³É¶ÔÓ¦µÄASCIIÂe×Ö*u£¬Èç 35 ¶ÔÓ¦ #  


3¡¢Öظ´ÒÔÉÏ 1¡¢2 ²½Öe n ´Î£¬Á¬½Ó³É n λµÄÃÜÂe

 ¸ÃËa*¨Ö÷ÒªÓõ½ÁËÁ½¸oº¯Êý£¬mt_rand ( int $min , int $max )º¯ÊýÓÃÓÚÉu³ÉËae»uÕuÊý£¬ÆaÖÐ $min ¨C $max Ϊ ASCII ÂeµÄ*¶Î§£¬ÕaÀiÈ¡ 33 -126 £¬¿ÉÒÔ¸u¾ÝÐeÒªµ÷Õu*¶Î§£¬ÈçASCIIÂe±iÖÐ 97 ¨C 122 λ¶ÔÓ¦ a ¨C z µÄÓ¢ÎÄ×Öĸ£¬¾ßÌa¿É²Î¿¼ ASCIIÂe±i£» chr ( int $ascii )º¯ÊýÓÃÓÚ½«¶ÔÓ¦ÕuÊý $ascii ת»»³É¶ÔÓ¦µÄ×Ö*u¡£

    function create_password($pw_length = 8)
    {
     $randpwd = '';
     for ($i = 0; $i < $pw_length; $i++) 
     {
      $randpwd .= chr(mt_rand(33, 126));
     }
     return $randpwd;
    }

// µ÷Óøú¯Êý£¬´«µÝ³¤¶È²ÎÊý$pw_length = 6

    echo create_password(6);

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 1¡¢Ô¤ÖÃÒ»¸oµÄ×Ö*u´® $chars £¬°uÀ¨ a ¨C z£¬A ¨C Z£¬0 ¨C 9£¬ÒÔ¼°Ò»Ð(C)ÌØÊa×Ö*u  


 2¡¢ÔÚ $chars ×Ö*u´®ÖÐËae»uÈ¡Ò»¸o×Ö*u  


3¡¢Öظ´µÚ¶þ²½ n ´Î£¬¿ÉµÃ³¤¶ÈΪ n µÄÃÜÂe

    function generate_password( $length = 8 ) {
     // ÃÜÂe×Ö*u¼¯£¬¿ÉÈÎÒaÌi¼ÓÄaÐeÒªµÄ×Ö*u
     $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|';

     $password = '';
     for ( $i = 0; $i < $length; $i++ ) 
     {
      // ÕaÀiÌa¹(C)Á½ÖÖ×Ö*u»ñÈ¡*½Ê½
      // µÚÒ»ÖÖÊÇʹÓà substr ½ØÈ¡$charsÖеÄÈÎÒaһλ×Ö*u£»
      // µÚ¶þÖÖÊÇÈ¡×Ö*uÊý×e $chars µÄÈÎÒaÔªËØ
      // $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
      $password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
     }

     return $password;
    }

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 1¡¢Ô¤ÖÃÒ»¸oµÄ×Ö*uÊý×e $chars £¬°uÀ¨ a ¨C z£¬A ¨C Z£¬0 ¨C 9£¬ÒÔ¼°Ò»Ð(C)ÌØÊa×Ö*u  


 2¡¢Í¨¹ýarray_rand()´ÓÊý×e $chars ÖÐËae»uÑ¡³o $length ¸oÔªËØ  


 3¡¢¸u¾ÝÒÑ»ñÈ¡µÄ¼uÃuÊý×e $keys£¬´ÓÊý×e $chars È¡³o×Ö*uÆ´½Ó×Ö*u´®¡£¸Ã*½*¨µÄȱµaÊÇÏaͬµÄ×Ö*u²»»aÖظ´È¡¡£

    function make_password( $length = 8 )
    {
     // ÃÜÂe×Ö*u¼¯£¬¿ÉÈÎÒaÌi¼ÓÄaÐeÒªµÄ×Ö*u
     $chars = array('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 
     'i', 'j', 'k', 'l','m', 'n', 'o', 'p', 'q', 'r', 's', 
     't', 'u', 'v', 'w', 'x', 'y','z', 'A', 'B', 'C', 'D', 
     'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L','M', 'N', 'O', 
     'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y','Z', 
     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '!', 
     '@','#', '$', '%', '^', '&', '*', '(', ')', '-', '_', 
     '[', ']', '{', '}', '<', '>', '~', '`', '+', '=', ',', 
     '.', ';', ':', '/', '?', '|');
     // ÔÚ $chars ÖÐËae»uÈ¡ $length ¸oÊý×eÔªËؼuÃu
     $keys = array_rand($chars, $length); 
     $password = '';
     for($i = 0; $i < $length; $i++)
     {
      // ½« $length ¸oÊý×eÔªËØÁ¬½Ó³É×Ö*u´®
      $password .= $chars[$keys[$i]];
     }
     return $password;
    }

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 1¡¢time() »ñÈ¡µ±Ç°µÄ Unix ʱ¼a´Á  


 2¡¢½«µÚÒ»²½»ñÈ¡µÄʱ¼a´Á½øÐÐ md5() ¼ÓÃÜ  


3¡¢½«µÚ¶þ²½¼ÓÃܵĽa¹u£¬½ØÈ¡ n λ¼´µÃÏeÒªµÄÃÜÂe

    function get_password( $length = 8 ) 
    {
     $str = substr(md5(time()), 0, 6);
     return $str;
    }

ʱ¼aЧÂʶԱÈ

 ÎÒÃÇʹÓÃÒÔÏÂPHP´uÂe£¬¼ÆËaÉÏÃaeµÄ 4 ¸oËae»uÃÜÂeÉu³Éº¯ÊýÉu³É 6 λÃÜÂeµÄÔËÐÐʱ¼a£¬½ø¶ø¶ÔËuÃǵÄʱ¼aЧÂʽøÐÐÒ»¸o¼oµ¥µÄ¶Ô±È¡£

    <?php
    function getmicrotime()
    {
     list($usec, $sec) = explode(" ",microtime());
     return ((float)$usec + (float)$sec);
    }
    // ¼Ç¼¿ªÊ¼Ê±¼a
    $time_start = getmicrotime();
    // ÕaÀi*ÅÒªÖ´ÐеÄPHP´uÂe£¬Èç:
    // echo create_password(6);
    // ¼Ç¼½aÊøʱ¼a
    $time_end = getmicrotime();
    $time = $time_end - $time_start;
     // Êa³oÔËÐÐ×Üʱ¼a 
    echo "Ö´ÐÐʱ¼a $time seconds";
    ?>

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    function rand_string($len = 16, $keyword = '') {
     if (strlen($keyword) > $len) {//¹Ø¼u×Ö²»ÄܱÈ×ܳ¤¶È³¤
      return false;
     }
     $str = '';
     $chars = 'abcdefghijkmnpqrstuvwxyz23456789ABCDEFGHIJKMNPQRSTUVWXYZ'; //È¥µo1¸u×Öĸl*À»iÏý   
     if ($len > strlen($chars)) {//λÊý¹ý³¤Öظ´×Ö*u´®Ò»¶¨´ÎÊý
      $chars = str_repeat($chars, ceil($len / strlen($chars)));
     }
     $chars = str_shuffle($chars); //´oÂÒ×Ö*u´®
     $str = substr($chars, 0, $len);
     if (!empty($keyword)) {
      $start = $len - strlen($keyword);
      $str = substr_replace($str, $keyword, mt_rand(0, $start), strlen($keyword)); //´ÓËae»uλÖòaÈe¹Ø¼u×Ö
     }
     return $str;
    }

    echo rand_string(16,"ab"); //output example:V8bNY6SmkeywordB
    ?>

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