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copied!<p>For comparing strings I'd recommend using the triple equals operator over double equals.</p> <pre><code>// This evaluates to true (this can be a surprise if you really want 0) if ("0" == false) { // do stuff } // While this evaluates to false if ("0" === false) { // do stuff } </code></pre> <p>For checking the $_GET variable I rather use array_key_exists, isset can return false if the key exists but the content is null</p> <p>something like:</p> <pre><code>$_GET['param'] = null; // This evaluates to false if (isset($_GET['param'])) { // do stuff } // While this evaluates to true if (array_key_exits('param', $_GET)) { // do stuff } </code></pre> <p>When possible avoid doing assignments such as:</p> <pre><code>$myVar = $_GET['param']; </code></pre> <p>$_GET, is user dependant. So the expected key could be available or not. If the key is not available when you access it, a run-time notice will be triggered. This could fill your error log if notices are enabled, or spam your users in the worst case. Just do a simple array_key_exists to check $_GET before referencing the key on it.</p> <pre><code>if (array_key_exists('subject', $_GET) === true) { $subject = $_GET['subject']; } else { // now you can report that the variable was not found echo 'Please select a subject!'; // or simply set a default for it $subject = 'unknown'; } </code></pre> <p>Sources:</p> <p><a href="http://ca.php.net/isset" rel="nofollow">http://ca.php.net/isset</a></p> <p><a href="http://ca.php.net/array_key_exists" rel="nofollow">http://ca.php.net/array_key_exists</a></p> <p><a href="http://php.net/manual/en/language.types.array.php" rel="nofollow">http://php.net/manual/en/language.types.array.php</a></p>

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