username, password and date validation with php


/ Published in: PHP

Simple PHP functions to validate username, password and date, functions check the input format and allowed characters and then return TRUE for valid data and FALSE for invalid data.


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  1. <?php
  2.  
  3. function is_valid_username($username){
  4. // accepted username length between 5 and 20
  5. if (preg_match('/^\w{5,20}$/', $username))
  6. return true;
  7. else
  8. return false;
  9. }
  10.  
  11.  
  12. function is_valid_password($pwd){
  13. // accepted password length between 5 and 20, start with character.
  14. if (preg_match("/^[a-zA-Z][[email protected]#^&]{5,20}$/", $pwd))
  15. return true;
  16. else
  17. return false;
  18. }
  19.  
  20.  
  21. function is_valid_date($date){
  22. //============ date format dd-mm-yyyy
  23. if(preg_match("/^(\d{2})-(\d{2})-(\d{4})$/", $date, $sdate))
  24. if(checkdate($sdate[2], $sdate[1], $sdate[3]))
  25. return true;
  26. }
  27.  
  28. ?>

URL: http://function-code.blogspot.com/2013/10/username-password-and-date-validation.html

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