very simple php form - one field not submitting

[neco198]

I am making a simple registration form and cannot get one of the select fields to submit. My HTML and PHP all validates fine can anyone please help? My PHP looks like this:\[code\]<?php$where_form_is="http://".$_SERVER['SERVER_NAME'].strrev(strstr(strrev($_SERVER['PHP_SELF']),"/"));// Checkbox handling$field_9_opts = $_POST['field_9'][0];mail("[email protected]","A message from the Website","A message from the Website:Their name: " . $_POST['field_1'] . " Their email address: " . $_POST['field_2'] . " Their contact number: " . $_POST['field_3'] . " The customer would prefer to be contacted: " . $_POST['field_4'] . " The type of property the customer is interested in: " . $_POST['field_5'] . " Their price range: " . $_POST['field_6'] . " Their reason for purchase: " . $_POST['field_7'] . "They heard about Parkway Newbury from: " . $_POST['field_8'] . " Keep me updated on news on Parkway Living, Newbury: $field_9_opts ");include("confirm.html");?>\[/code\]and my HTML looks like this:\[code\]<form method="post" enctype="multipart/form-data" action="processor.php"><ul id="mainForm_1"><li id="fieldBox_1"><label>Your name&nbsp;*</label><input type="text" name="field_1" id="field_1" size="20" value="" /></li><li id="fieldBox_2"><label>Your email address&nbsp;*</label><input type="text" name="field_2" id="field_2" size="20" value="" /></li><li id="fieldBox_3"><label>Your contact number&nbsp;*</label><input type="text" name="field_3" id="field_3" size="20" value="" /></li><li id="fieldBox_4"><label>I would prefer to be contacted&nbsp;*</label><select name="field_4" id="field_4"> <option value="">Please select from the list</option> <option value="http://stackoverflow.com/questions/3922198/In the morning">In the morning</option> <option value="http://stackoverflow.com/questions/3922198/In the afternoon">In the afternoon</option> <option value="http://stackoverflow.com/questions/3922198/In the evening">In the evening</option> <option value="http://stackoverflow.com/questions/3922198/Anytime">Anytime</option></select></li><li id="fieldBox_5"><label>Property type&nbsp;*</label><select name="field_5" id="field_5"> <option value="">Please select from the list</option> <option value="http://stackoverflow.com/questions/3922198/Duplex">Duplex</option> <option value="http://stackoverflow.com/questions/3922198/Apartment">Apartment</option> <option value="http://stackoverflow.com/questions/3922198/Both">Both</option></select></li><li id="fieldBox_6"><label>Prices from&nbsp;*</label><select name="field_6" id="field_6"> <option value="">Please select from the list</option> <option value="http://stackoverflow.com/questions/3922198/upto £200,000">upto &pound;200,000</option> <option value="http://stackoverflow.com/questions/3922198/£200,000 - £300,000">&pound;200,000 - &pound;300,000</option> <option value="http://stackoverflow.com/questions/3922198/£300,000 - £400,000">&pound;300,000 - &pound;400,000</option> <option value="http://stackoverflow.com/questions/3922198/Above £400,000">Above &pound;400,000</option></select></li><li id="fieldBox_7"><label>Reason for purchase&nbsp;*</label><select name="field_7" id="field_7"> <option value="">Please select from the list</option> <option value="http://stackoverflow.com/questions/3922198/Moving into the area">Moving into the area</option> <option value="http://stackoverflow.com/questions/3922198/First time buyer">First time buyer</option> <option value="http://stackoverflow.com/questions/3922198/Downsizing">Downsizing</option> <option value="http://stackoverflow.com/questions/3922198/Need more space">Need more space</option></select></li><li id="fieldBox_8"><label>Where did you hear about Parkway Living?&nbsp;*</label><select name="field_8" id="field_8"> <option value="">Please select from the list</option> <option value="http://stackoverflow.com/questions/3922198/Website">Website</option> <option value="http://stackoverflow.com/questions/3922198/National advertising">National Advertising</option> <option value="http://stackoverflow.com/questions/3922198/Local advertising">Local Advertising</option> <option value="http://stackoverflow.com/questions/3922198/Recommendation">Recommendation</option> <option value="http://stackoverflow.com/questions/3922198/Selling agent">Selling agent</option> <option value="http://stackoverflow.com/questions/3922198/Site visit">Site visit</option> <option value="http://stackoverflow.com/questions/3922198/Other">Other</option></select></li><li id="fieldBox_9"><label>Keep me updated on news on Parkway Living, Newbury&nbsp;*</label><span> <input type="checkbox" name="field_9[]" id="field_9_option_1" value="http://stackoverflow.com/questions/3922198/yes" /></span></li><li><input id="saveForm" type="submit" value="http://stackoverflow.com/questions/3922198/Submit" /></li></ul></form>\[/code\]The field that will not submit is field 8. I would appreciate any advice. Thanks in advance.