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PHP Form Validation

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This is a good way to validate form input from PHP, in essence this could be a blue print for your forms.

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  1. <?php
  2.  
  3.  
  4. //  Quick function to loop through regexs and compare to what is in _POST
  5. //  
  6. //  $regs    ->   associative array of regular expressions
  7. //  $ferrors ->   error messages to display to the users asociative array
  8.  
  9. function validatePost( $regs , $ferrors )
  10. {
  11. 	$errors = array();
  12. 	foreach( $regs as $k => $v )
  13. 	{
  14. 		if( ! preg_match( $v , $_POST[$k] ) )
  15. 		{
  16. 			$errors[$k] = $ferrors[$k];
  17. 		}
  18. 	}
  19. 	return $errors;
  20. }
  21.  
  22.  
  23. // has the post been submitted?
  24. if( count( $_POST ) )
  25. {
  26. 	// yes it has been submitted so lets validate
  27. 	$regs['last_name']  = "/^[[:alpha:]\ -]+$/";  // require a alpha
  28. 	$regs['first_name'] = "/^[[:alpha:]\ -]+$/";  // require a alpha
  29. 	$regs['email']      = "/^..*\@..*$/";         // VERY simple email check
  30. 	                                            // Use google to find better
  31.  
  32.  
  33. 	// Ok here are the error message to display when it is bad
  34. 	$ferrors['last_name']  = "Last name required";
  35. 	$ferrors['first_name'] = "First name required";
  36. 	$ferrors['email']      = "Email name required";
  37.  
  38. 	$errors = validatePost( $regs , $ferrors );
  39.  
  40. 	// Do we have errors?
  41. 	if( count( $errors ) == 0 )
  42. 	{
  43. 		//  WE HAVE NO ERRORS DO SOMETHING
  44. 		//  PUT IT INTO THE DATABASE, EMAIL, BOUNCE THE USER
  45. 		//  TO A THANK YOU PAGE, ETC...
  46. 	}
  47. }
  48. ?>
  49.  
  50.  
  51.  
  52. <!-- OK WE ARE IN HTML -->
  53. <!-- LETS MAKE THE FORM AND NOW YOU SEE HOW SIMPLE THIS IS I HOPE -->
  54.  
  55. <form method="POST">
  56.  
  57. <p>
  58. <label>Last Name</label>
  59. <input type="text" name="last_name" value="<?= $_POST['last_name'] ?>" />
  60. <span style="color: #FF0000;"><?= $errors['last_name'] ?></span>
  61. </p>
  62.  
  63.  
  64. <p>
  65. <label>First Name</label>
  66. <input type="text" name="first_name" value="<?= $_POST['first_name'] ?>" />
  67. <span style="color: #FF0000;"><?= $errors['first_name'] ?></span>
  68. </p>
  69.  
  70.  
  71. <p>
  72. <label>Email</label>
  73. <input type="text" name="email" value="<?= $_POST['email'] ?>" />
  74. <span style="color: #FF0000;"><?= $errors['email'] ?></span>
  75. </p>
  76.  
  77.  
  78. <p>
  79. <input type="submit" name="subby" value="GO" />
  80. </p>
  81.  
  82.  
  83. </form>

URL: http://www.goingson.be/2009/05/my-super-awesome-php-functions-part-v.html

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