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Simple addition function is php

/ Published in: PHP
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Very basic dont judge!

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  1. <?php
  2.  
  3. if(isset($_POST['sum1']) && isset($_POST['sum2']))
  4. {
  5. 	$sum1 = $_POST['sum1'];
  6. 	$sum2 = $_POST['sum2'];
  7.  
  8. 	function add($sum1,$sum2)
  9. 	{
  10. 		$answer = $sum1 + $sum2;
  11.  
  12. 		if(!is_numeric($sum1) || !is_numeric($sum2))
  13. 		{
  14. 			return 'Please enter a number nob!';
  15. 		}
  16.  
  17. 		echo $sum1 . ' + ' . $sum2 . ' = ' . $answer;
  18. 	}	
  19.  
  20. 	echo add($sum1,$sum2);
  21. }
  22.  
  23. ?>
  24.  
  25. <form method="post" action="#">
  26. 	<input type="text" name="sum1" value="" /><br />
  27. 	<input type="text" name="sum2" value="" /><br />
  28.  
  29. 	<input type="submit" name="submit" value="Add" />
  30. </form>

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