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    <p>It is important to mention that your $volume, $gain, $treble, $middle and $bass will never actually be null as you have assigned a string to them in addition to the $_POST value. In addition you should always check if the $_POST values exist before trying to use them (or you will get an undefined notice message).</p> <p>Here is an example for a PHP version based on the code you had (untested, but should work fine).</p> <pre><code>&lt;?php function isValidRange( $value, $low = 0, $high = 65535) { // validate / cast value as int (add additional validation here $value = (int)$value; if ( $value &gt; $high || $value &lt; $low ) { // return null (not a valid value) return null; } // otherwise the value is valid so return it return $value; } // make sure the $name var is safe to use $name = ( isset($_POST['ampMod']) ) ? htmlentities($_POST['ampMod'],ENT_QUOTES,'UTF-8') : null; $volume = ( isset($_POST['volume']) ) ? isValidRange($_POST['volume']) : null; $gain = ( isset($_POST['gain']) ) ? isValidRange($_POST['gain']) : null; $treble = ( isset($_POST['treble']) ) ? isValidRange($_POST['treble']) : null; $middle = ( isset($_POST['middle']) ) ? isValidRange($_POST['middle']) : null; $bass = ( isset($_POST['bass']) ) ? isValidRange($_POST['bass']) : null; if( isset($volume) &amp;&amp; isset($gain) &amp;&amp; isset($treble) &amp;&amp; isset($middle) &amp;&amp; isset($bass) ) { echo "&lt;h3&gt; $name &lt;/h3&gt;"; echo "&lt;table&gt;&lt;tr&gt;"; echo "&lt;td&gt;Volume = $volume&lt;/td&gt;"; echo "&lt;td&gt;Gain = $gain&lt;/td&gt;"; echo "&lt;td&gt;Treble = $treble&lt;/td&gt;"; echo "&lt;td&gt;Middle = $middle&lt;/td&gt;"; echo "&lt;td&gt;Bass = $bass&lt;/td&gt;"; echo "&lt;/tr&gt;&lt;/table&gt;"; } else { echo ("Please try again. Values must be between 0-65535. 0=Off 65535=Full On 10&lt;br&gt;&lt;a href = \"ampchoice.php\"&gt;Click here to try again!&lt;/a&gt;");} ?&gt; </code></pre> <p>Lastly I would not recommend just relying on JavaScript to actually check if your values are safe to use (i.e. echo them out), but using js as a pre-warning to users and then properly validating with PHP is the best way to go.</p>
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