获取随机数作为验证码

Jsky
2020-09-10 19:58:07
PHP
PHP Thinkphp

/**
 * 获取随机数作为验证码
 * @param int $digit 验证码位数
 * @param int $type 验证码类型 1：默认数字 2：字符 3:数字+字符
 * @return string $authnum  返回验证码
 */
function randomStr($digit = 6, $type = 1)
{
   if ($type == 1) {
      $char = "0,1,2,3,4,5,6,7,8,9";
      $x = 9;
   } elseif ($type == 2) {
      $char = "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";
      $x = 25;
   } else {
      $char = "0,1,2,3,4,5,6,7,8,9,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";
      $x = 35;
   }

   $authnum = "";
   $list = explode(",", $char);
   for ($i = 0; $i < $digit; $i++) {
      $randnum = rand(0, $x); // 10+26;
      $authnum .= $list[$randnum];
   }
   return $authnum;
}