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    <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>&lt;input type="text"&gt;</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>&lt;input type="type"&gt;</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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    1. POPHP Logic - Return False of one or two out of three are not set
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    1. USAndrew Moore
    1. USAndrew Moore
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    1. COThis is great, except that I don't accept the data as one string, but three. I'm using parts of your regex with RaYell's !empty() approach right now, will post finalized version and give the answer to the one I feel helped the most.
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    2. CO**@Andrew E.:** Using 3 different inputs not only complicates your code, but also complicates the entry process for the user. I strongly recommend using one input.
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    3. COAnd like I said in my post, **do not use `empty()`**.
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