Several methods of getting random string in PHP

Method One: Shuffle function (scrambled array) and Mt_rand function (generate random number, four times times faster than Rand)

1 /**2 * Get random string3 * @param the length $len need4 * @param $special need special symbols5 * @return String returns a random string6  */7 functionGETRANDOMSTR ($len,$special=true){8     $chars=Array(9"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K",Ten"L", "M", "N", "O", "P", "Q", "R", "s", "T", "U", "V", One"W", "X", "Y", "Z", "A", "B", "C", "D", "E", "F", "G", A"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", -"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", -"3", "4", "5", "6", "7", "8", "9" the     ); -  -     if($special){ -         $chars=Array_merge($chars,Array( +"!", "@", "#", "$", "?", "|", "{", "/", ":", ";", -"%", "^", "&", "*", "(", ")", "-", "_", "[", "]", +"}", "<", ">", "~", "+", "=", ",", "." A         )); at     } -  -     $charsLen=Count($chars)-1; -     Shuffle($chars);//Scrambled Array Order -     $str= ' '; -      for($i= 0;$i<$len;$i++){ in         $str.=$chars[Mt_rand(0,$charsLen)];//randomly take out a bit -     } to     return $str; +}

Method Two, Str_shuffle function (scrambled string order) and Mt_rand function

1 // take a random 10-bit string 2 $strs= "qwertyuiopasdfghjklzxcvbnm1234567890qwertyuiopasdfghjklzxcvbnm"; 3 $name=substr(str_shuffle($strs),Mt_rand(0,strlen ($strs) -11); 4 Echo $name;

Method three, MD5 (), uniqid (), microtime () generate a unique 32-bit string

$uniqid MD5 (uniqid(microtime(true),true)); // Microtime (True)  returns the number of milliseconds of the system's current timestamp

Other methods:

1 /**2 * Method One: Get random string3 * @param number $length length4 * @param string $type type5 * @param number $convert convert case6 * @return string random strings7      */8     functionRandom$length= 6,$type= ' String ',$convert= 0)9     {Ten         $config=Array( One' Number ' = ' 1234567890 ', A' Letter ' = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz ', -' String ' = ' abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789 ', -' All ' = ' abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 ' the         ); -   -         if(!isset($config[$type])) -             $type= ' String '; +         $string=$config[$type]; -   +         $code= ' '; A         $strlen=strlen($string)-1; at          for($i= 0;$i<$length;$i++) { -             $code.=$string{Mt_rand(0,$strlen)}; -         } -         if(!Empty($convert)) { -             $code= ($convert> 0)?Strtoupper($code) :Strtolower($code); -         } in         return $code; -     } to   +     /** - * Method Two: Get random string the * @param int $randLength length * * @param int $addtime Whether to join the current timestamp $ * @param int $includenumber Whether it contains a numberPanax Notoginseng * @return String -      */ the     functionRAND_STR ($randLength= 6,$addtime= 1,$includenumber= 0) +     { A         if($includenumber) { the             $chars= ' abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQEST123456789 '; +}Else { -             $chars= ' ABCDEFGHIJKLMNOPQRSTUVWXYZ '; $         } $         $len=strlen($chars); -         $randStr= ' '; -          for($i= 0;$i<$randLength;$i++) { the             $randStr.=$chars[Mt_Rand(0,$len-1)]; -         }Wuyi         $tokenvalue=$randStr; the         if($addtime) { -             $tokenvalue=$randStr. Time(); Wu         } -         return $tokenvalue; About}

Several methods of getting random string in PHP