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Validate (input) password

/ Published in: PHP
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This is a useful function if you need to validate a password (input). If you have a form and you need to check if the username, which is registering, entered a valid password (without illegal characters) then this would help you to do it. Only letters, numbers and underscores are accepted.

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  1. # <?php  
  2. # /* 
  3. # Credits: http://www.bitrepository.com/ 
  4. # */  
  5. #   
  6. # // default chars values are defined  
  7. # function validate_password($password, $min_char = 4, $max_char = 20)  
  8. # {  
  9. # // Remove whitespaces from the beginning and end of a string  
  10. # $password = trim($password);   
  11. #   
  12. # // Accept only letters, numbers and underscore  
  13. # $eregi = eregi_replace('([a-zA-Z0-9_]{'.$min_char.','.$max_char.'})',  
  14. # '', $password);  
  15. #   
  16. # if(empty($eregi))  
  17. #     {  
  18. #     return true;  
  19. #     }  
  20. #     else  
  21. #     {  
  22. #     return false;  
  23. #     }  
  24. # }  
  25. #   
  26. # $password = 'my_password_123';  
  27. #   
  28. # /* 
  29. # First parameter: Password 
  30. # Second parameter: Minimum chars 
  31. # Third parameter: Maximum chars 
  32. # */  
  33. #   
  34. # $validator = validate_password($password, 4, 20);  
  35. #   
  36. # if($validator)  
  37. # {  
  38. # // Our current example will return true  
  39. # echo 'The password is valid.';  
  40. # }  
  41. # else  
  42. # {  
  43. # /* if our password value is for instance: my_@#%_password 
  44. # our function will return false */  
  45. # echo 'The password appears to be invalid.  
  46. # It should contain only letters, numbers and underscore.';  
  47. # }  
  48. # ?>

URL: http://www.bitrepository.com/web-programming/php/validate-input-password.html

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