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Use of PHP isset for a submit form

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Simple PHP tutorial on how to use isset.

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  1. <!DOCTYPE html 
  2.      PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  3.      "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
  4. <html xmlns="http://www.w3.org/1999/xhtml" lang="en">
  5. 	<head>
  6. 		<title>PHP Test</title>
  7. 	</head>
  8. 	<body>
  9. 		<?php
  10. 		 	if(!isset($_POST['submit'])){
  11. 		?>
  12.  
  13. 		<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
  14. 		Enter your age: <input name="age" size="2">
  15. 		<input type="submit" name="submit" value="Go">
  16.  
  17. 		<?php 
  18. 			} else {
  19. 				//Grab the text we input
  20. 				$input = $_POST['age'];
  21.  
  22. 				if($input < 27){
  23. 					echo "You are young";
  24. 				} elseif($input == 27){
  25. 					echo "The perfect age";
  26. 				} elseif($input > 27){
  27. 					echo "You are old!";
  28. 				}
  29. 			}
  30. 		?>
  31. 	</body>
  32. </html>

URL: http://devzone.zend.com/node/view/id/628

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