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copied!<p>The reason why your code isn't working is not because of your boolean logic, but because of your use of <code>isset()</code>. In the case of a <code><input type="text"></code>, the <code>$_POST['fieldName']</code> will always be set, regardless of if the value is empty or not.</p> <p>Use <code>$_POST['fieldName'] != ''</code> instead to determine if the user has entered a value. <strong>DO NOT USE <code>empty()</code></strong>, as this will return any falsy value as empty (<code>0</code>, <code>000</code>, <code>false</code>, etc...).</p> <hr> <p>Personally, I rather use one <code><input type="type"></code> for the phone number. This is less annoying than making the user switch boxes, and also makes validation simpler. </p> <p>This example actually validates if the number follows <a href="http://en.wikipedia.org/wiki/NANP" rel="nofollow noreferrer">NANP</a> rules. I find it absolutely ridiculous that so many applications/websites oversees this validation step.</p> <pre><code>// Did the user post a number? if($_POST['phone'] != '') { // Get only the numbers, we don't care how the user formatted their number $_POST['phone'] = preg_replace('/[^0-9]/', '', $_POST['phone']); // Is it a valid NANP phone number? if(preg_match('/^1?[2-9][0-8][0-9][2-9][0-9]{6}$/i', $_POST['phone']) === 1) { echo "Valid NANP phone number"; // Trim the leading one $_POST['phone'] = ltrim($_POST['phone'], '1'); // Format as wanted $_POST['PhoneNumber'] = '+01'.substr($_POST['phone'],0,3).'-'.substr($_POST['phone'],3,3).'-'.substr($_POST['phone'],6,4); } else { echo "Invalid phone number"; } } else { echo "User didn't provide phone number"; } </code></pre>

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