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POUndefined index: DLL
 

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  1. POUndefined index: DLL
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    <pre><code>&lt;?php if (isset($_POST['first']) &amp;&amp; isset($_POST['second']) &amp;&amp; isset($_POST['submit']) &amp;&amp; $_POST['DDL'] == "+") { $equals = $_POST['first'] + $_POST['second']; } if (isset($_POST['first']) &amp;&amp; isset($_POST['second']) &amp;&amp; isset($_POST['submit']) &amp;&amp; $_POST['DDL'] == "-") { $equals = $_POST['first'] - $_POST['second']; } if (isset($_POST['first']) &amp;&amp; isset($_POST['second']) &amp;&amp; isset($_POST['submit']) &amp;&amp; $_POST['DDL'] == "*") { $equals = $_POST['first'] * $_POST['second']; } if (isset($_POST['first']) &amp;&amp; isset($_POST['second']) &amp;&amp; isset($_POST['submit']) &amp;&amp; $_POST['DDL'] == "/") { $equals = $_POST['first'] / $_POST['second']; } print $_POST['DDL']; // THIS IS THE LINE THAT RESULTS IN THE ERROR! WHY? ?&gt; &lt;html&gt; &lt;body&gt; &lt;form method="post"&gt; &lt;input type="text" name="first"&gt; &lt;select name="DDL"&gt; &lt;option value="+" selected="selected"&gt;+&lt;/option&gt; &lt;option value="-"&gt;-&lt;/option&gt;b &lt;option value="*"&gt;*&lt;/option&gt; &lt;option value="/"&gt;/&lt;/option&gt; &lt;/select&gt; &lt;input type="text" name="second"&gt; &lt;input type="submit" name="submit" value="Equals"&gt; &lt;input type="text" name="equals" value="&lt;?php if (!empty($equals)) print($equals) ?&gt;"&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The previous code results in the following error when accessing the index.php file BEFORE SUBMITTING THE FORM:</p> <p><a href="http://i42.tinypic.com/11jaf5x.png" rel="nofollow noreferrer">a busy cat http://i42.tinypic.com/11jaf5x.png</a></p> <p>The php code "print $_POST['DDL'];" is causing the error.</p> <p>Why is this happening? I've already chosen a default value by using "+"...</p>
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    1. USBirdman
    1. USBirdman
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    1. COSo it results in the undefined index after you post the form?
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      1. USPekka 웃
    2. COThe error disappears after I post the form and prints out the desired result.
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      1. POUndefined index: DLL
      1. USBirdman
    3. CO`$_POST["DDL"]` will not be present before the form is posted. That's how forms work. You could use `isset()` like you do in the code above to prevent the error from showing
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      1. POUndefined index: DLL
      1. USPekka 웃
 

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