PHP Image Upload Problem - php4

Question

Getting Undefined index: filename error in the below image upload php code. Is there any problem in the below code?
<div id="content">
<form class="wufoo" action=<?php echo (BASE_PATH. 'admin/addbusinessdetail'); ?> method="post">
<input type="hidden" name="maxSize" value="9999999999" />
<input type="hidden" name="maxW" value="200" />
<input type="hidden" name="fullPath" value="<?php echo (BASE_PATH. 'public/img/uploads/'); ?>" />
<input type="hidden" name="relPath" value="<?php echo (BASE_PATH. 'public/img/uploads/'); ?>" />
<input type="hidden" name="colorR" value="255" />
<input type="hidden" name="colorG" value="255" />
<input type="hidden" name="colorB" value="255" />
<input type="hidden" name="maxH" value="300" />
<ul>
<li>
<label class="desc">Business Type</label>
<br />
<div>
<select class="field select" name="ddltype" style="width:300px; height: 30px;">
<?php
$types = $this->_data;
foreach ($types as $value) {
foreach($value as $innvalue){
$businessname[] = $innvalue;
}
echo('<option value="'.$businessname[0].'">'.$businessname[1].'</option>');
unset($businessname);
}
?>
</select>
</div>
</li>
<li>
<label class="desc">Business Detail <span class="req">*</span></label>
<br />
<div>
<input type="text" class="field text" name="businessname" style="width: 300px; height: 20px;" />
</div>
</li>
<li>
<label class="desc">Business Website <span class="req">*</span></label>
<br />
<div>
<input type="text" class="field text" name="website" style="width: 300px; height: 20px;" />
</div>
</li>
<li>
<label class="desc">Business Email <span class="req">*</span></label>
<br />
<div>
<input type="text" class="field text" name="email" style="width: 300px; height: 20px;" />
</div>
</li>
<li>
<label class="desc">Business Image <span class="req">*</span></label>
<br />
<div>
<input type="file" name="filename" />
</div>
</li>
<li>
<label class="desc">Address <span class="req">*</span></label>
<br />
<div>
<textarea name="address" cols="50" rows="8" ></textarea>
</div>
</li>
<li class="buttons">
<input class="submit" type="submit" value="Save" /> <input class="submit" type="button" value="Cancel" onClick="history.back()" />
</li>
</ul>
</form>
addbusinessdetail controller
function addbusinessdetail()
{
print_r($_FILES['filename']);
$this->Admin->addbusinessdetail();
$this->businessdetails(0,0);
}

Answer 1

add this to your form tag:
enctype="multipart/form-data"
If you're doing a file upload, you need this form attribute so the web server knows to expect file data.Here's some more info on file uploads: http://www.tizag.com/phpT/fileupload.php