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    <p>I found a solution at <a href="http://forums.phpfreaks.com/topic/283274-simple-math-problem/?p=1455892" rel="nofollow">this site</a>. Here is the code from that post:</p> <pre><code> &lt;?php $expression = ''; $input = array( 'a' =&gt; 5, 'b' =&gt; 10, 'c' =&gt; 15, 'd' =&gt; 20); $total = 0; $sum = ''; // Override default expression and input values if(isset($_POST['Calculate'])) { $input = $_POST['input']; $expression = $_POST['expression']; } // make sure the users expression is safe to use if(preg_match('#^[a-z+-\s]+$#i', $expression)) { $sum = $expression; $input_letters = array(); $input_operators = array(); for ($i = 0; $i &lt; strlen($expression) ; $i++) { if (($i % 2) == 0) { $input_letters[] = $expression[$i]; } else { $input_operators[] = $expression[$i]; } } // for ($i = 0 ; $i &lt; sizeof($input_letters); $i++) { $value = $input[$input_letters[$i]]; if ($i == 0) { $sum += $value; } else { if ($input_operators[$i-1] == '+') { $sum += $value; } else if ($input_operators[$i-1] == '-') { $sum -= $value; } } } } else { echo "Error: expression not correct form"; } ?&gt; &lt;form action="" method="post"&gt; Number A: &lt;input type="text" name="input[a]" value="&lt;?php echo $input['a']; ?&gt;" size=3&gt; &lt;br/&gt; Number B: &lt;input type="text" name="input[b]" value="&lt;?php echo $input['b']; ?&gt;" size=3&gt; &lt;br&gt; Number C: &lt;input type="text" name="input[c]" value="&lt;?php echo $input['c']; ?&gt;" size=3&gt; &lt;br&gt; Number D: &lt;input type="text" name="input[d]" value="&lt;?php echo $input['d']; ?&gt;" size=3&gt; &lt;br&gt; &lt;br&gt; Expression: &lt;input type = "text" name = "expression" value="&lt;?php echo $expression ?&gt;"&gt; = &lt;?php echo $sum; ?&gt;&lt;br&gt; Sum: &lt;?php echo $sum; ?&gt;&lt;br&gt; &lt;input type="submit" name="Calculate" /&gt; &lt;/form&gt; </code></pre>
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    1. USAndrew Barber
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    1. COCorrection - someone else solved it for you --> http://forums.phpfreaks.com/topic/283274-simple-math-problem/?p=1455892
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    2. CODo not steal content from elsewhere without attributing it, and including some of your own explanation.
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