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POphp form validation using prerequisite
 

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    <p>i am trying to validate some fields in my form. I am working with two fields, "address" and "state", initially the "address" and "state" field are not compulsory but if any value is entered into the "address" field the "state" field (which is a selection list) automatically becomes compulsory. I am just unsure on how to code the right IF condition.</p> <p>Here is what i have started on:</p> <pre><code>&lt;?php if (isset($_POST["submit"])) { $address = $_POST["address"]; $address = trim($address); $lengtha = strlen($address); $post = $_POST["post"]; $state = $_POST["state"]; if ($lengtha &gt; 1) { ?&gt; &lt;form method="POST" action="&lt;?php echo $_SERVER["PHP_SELF"];?&gt;" id="custinfo" &gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;&lt;label for="custid"&gt;Customer ID (integer value): &lt;/label&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="custid" name="custid" value="&lt;?php echo $temp ?&gt;" size=11 /&gt;&lt;?php echo $msg; ?&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;label for="customerfname"&gt;Customer First Name: &lt;/label&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="fname" name="fname" size=50/&gt;&lt;?php echo $strmsg; ?&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;label for="customerlname"&gt;Customer Last Name: &lt;/label&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="lname" name="lname" size=50/&gt;&lt;?php echo $strmsgl; ?&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;label for="customeraddress"&gt;Customer Address: &lt;/label&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="address" name="address" size=65/&gt;&lt;/td&gt; &lt;td&gt;&lt;label for="suburb"&gt; Suburb: &lt;/label&gt;&lt;/td&gt; &lt;td&gt;&lt;input type="text" id="suburb" name="suburb"/&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt; State:&lt;select name="state" id="state"&gt; &lt;option value="select"&gt;--&lt;/option&gt; &lt;option value="ACT"&gt;ACT&lt;/option&gt; &lt;option value="NSW"&gt;NSW&lt;/option&gt; &lt;option value="NT"&gt;NT&lt;/option&gt; &lt;option value="QLD"&gt;QLD&lt;/option&gt; &lt;option value="SA"&gt;SA&lt;/option&gt; &lt;option value="TAS"&gt;TAS&lt;/option&gt; &lt;option value="VIC"&gt;VIC&lt;/option&gt; &lt;option value="WA"&gt;WA&lt;/option&gt; &lt;/select&gt; &lt;/td&gt; </code></pre> <p>Any help with figuring this out would be great!</p>
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