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php随机数代码：php生成随机数与随机字符串的例子

  2. /**
  3. * @param string $type
  4. * @param $length
  5. * @return string
  6. */
  7. function randomString($type="number,upper,lower",$length){
  8. $valid_type = array('number','upper','lower');
  9. $case = explode(",",$type);
  10. $count = count($case);
  11. //根据交集判断参数是否合法
  12. if($count !== count(array_intersect($case,$valid_type))){
  13. return false;
  14. }
  15. $lower = "abcdefghijklmnopqrstuvwxyz";
  16. $upper = strtoupper($lower);
  17. $number = "0123456789";
  18. $str_list = "";
  19. for($i=0;$i<$count;++$i){
  20. $str_list .= $$case[$i];
  21. }
  22. return substr(str_shuffle($str_list),0,$length);
  23. }
  24. echo randomString("number,upper,lower",12);