PHP生成随机字符串程序代码

/* Generate Password
* Length : 8
*/
$str = “0123456789abcdefghijklmnopqrstuvwxyz”;   //   输出字符集
$n = 8;   //   输出串长度
$len = strlen($str)-1;
for($i=0 ; $i<$n; $i++){
$s .=  $str[rand(0,$len)];
}
echo $s . “
”;
?>

function getRandStr($length) { 
$str = 'abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randString = '';
$len = strlen($str)-1;
for($i = 0;$i < $length;$i ++){
$num = mt_rand(0, $len);
$randString .= $str[$num];
}
return $randString ; 
}

//使用方法如下
$test=getRandStr($length=5);
echo $test;
?>

 /**
  */
 function createRandomStr($length){
  $str = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';//62个字符
  $strlen = 62;
  while($length > $strlen){
   $str .= $str;
   $strlen += 62;
  }
  $str = str_shuffle($str);
  return substr($str,0,$length);
 }
echo createRandomStr(10);

?>

 /**
  *@blog <www.111com.net>
  */
 function createRandomStr($length){
  $str = array_merge(range(0,9),range('a','z'),range('A','Z'));
  shuffle($str);
  $str = implode('',array_slice($str,0,$length));
  return $str;
 }
 echo createRandomStr(10);
?>