Home arrow PHP arrow Page 8 - Building An Extensible Form Validator Class

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Wondering what OOP can do for you? Well, wonder no more - thisarticle demonstrates how OOP can save you time and effort by building aPHP-based Form Validator object to validate HTML form input. In additionto a detailed walkthrough of the process of constructing a PHP class totest user input, this article also includes usage examples and a brieflook at some powerful open-source alternatives.

TABLE OF CONTENTS:
  1. Building An Extensible Form Validator Class
  2. Back To Class
  3. The Bare Bones
  4. How Things Work
  5. Private Eye
  6. Running On Empty
  7. Floating Like A Butterfly
  8. Mail Dot Com
  9. Under Construction
  10. A Quick Snack
  11. Going To The Source
  12. Closing Time
By: icarus, (c) Melonfire
Rating: starstarstarstarstar / 54
March 27, 2002

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It's also possible to create more complex validation routines using PHP's built-in support for regular expressions. This next method, isAlpha(), uses a regular expression to test whether all the characters in the input string are alphabetic.

<?php class FormValidator { // snip // check whether input is alphabetic function isAlpha($field, $msg) { $value = $this->_getValue($field); $pattern = "/^[a-zA-Z]+$/"; if(preg_match($pattern, $value)) { return true; } else { $this->_errorList[] = array("field" => $field, "value" => $value, "msg" => $msg); return false; } } } ?>
This ability to use regular expressions to perform data validation comes in particularly handy when checking user-supplied email addresses for validity - as the very cool (and very useful) class method isEmailAddress() demonstrates:

<?php class FormValidator { // snip // check whether input is a valid email address function isEmailAddress($field, $msg) { $value = $this->_getValue($field); $pattern = "/^([a-zA-Z0-9])+([\.a-zA-Z0-9_-])*@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-]+)+/ "; if(preg_match($pattern, $value)) { return true; } else { $this->_errorList[] = array("field" => $field, "value" => $value, "msg" => $msg); return false; } } } ?>


 
 
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