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POIs it possible to have a HTML SELECT/OPTION value as NULL using PHP?
 

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  1. POIs it possible to have a HTML SELECT/OPTION value as NULL using PHP?
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    <p>The following is a snippet from my HTML form which pulls the options from the table rows accordingly.</p> <p>What I want to do is have the first option value to be NULL so when no choice is made, NULL is entered when the form is submitted to the database.</p> <pre><code> &lt;td&gt;Type&lt;/td&gt; &lt;td&gt;:&lt;/td&gt; &lt;td&gt;&lt;select name="type_id" id="type_id" class="form"&gt; &lt;option value=""&gt;&lt;/option&gt; &lt;?php $sql = mysql_query("SELECT type_id, type FROM $tbl_add_type") or die(mysql_error()); while ($row = mysql_fetch_array($sql)) { echo "&lt;option value=".$row['type_id']."&gt;" . $row['type'] . "&lt;/option&gt;"; } ?&gt; &lt;/select&gt;*&lt;/td&gt; </code></pre> <p>Is this possible? Or could someone suggest an easier/better way of doing this?</p> <p>Thanks</p> <p>Update: Thanks for the answer, I'm using the method detailed below to convert it to NULL.</p> <pre><code>if ($_POST['location_id'] === '') { $_POST['location_id'] = 'NULL'; } </code></pre> <p>However when trying to use this NULL value with the following query it does not work.</p> <pre><code>UPDATE addresses SET location_id='NULL' WHERE ipid = '4791' </code></pre> <p>I know it needs to be <code>location_id=NULL</code> instead but don't know how to do this...</p> <p>Update 2: this is how my queries work:</p> <pre><code>if ($_POST['location_id'] === '') { $_POST['location_id'] = 'NULL'; // or 'NULL' for SQL } $notes=isset($_POST['notes']) ? mysql_real_escape_string($_POST['notes']) : ''; //$location_id=isset($_POST['location_id']) ? mysql_real_escape_string($_POST['location_id']) : ''; $ipid=isset($_POST['ipid']) ? mysql_real_escape_string($_POST['ipid']) : ''; $sql="UPDATE addresses SET notes='$notes', location_id='$location_id' WHERE ipid = '$ipid'"; mysql_query($sql) or die(mysql_error()); </code></pre>
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