Image upload in PHP

php_image_upload.php

<?php
function save($category) {   
	$packageguide = JRequest::get( 'POST' );
	$files = JRequest::get( 'FILES' );
	if (isset($files['image_upload']) && !$files['image_upload']['error']) {
		$dir = JPATH_ROOT.DS.'media'.DS.'packageguide'.DS.$category;
		if(!file_exists($dir)) {
			mkdir($dir, 0777, true);
		}
		move_uploaded_file($files['image_upload']['tmp_name'], $dir.DS.$files['image_upload']['name']);
		
		$packageguide['image'] = DS.'media'.DS.'packageguide'.DS.$category.DS.$files['image_upload']['name'];
		
	}
		
}
?>

<tr>
   <td class="key">Image</td>
   <td>
		<?php if ($this->object->image): ?>
			<img src="<?php print $this->object->image;?>" style="max-width:300px; margin:0 0 10px 0;" /><br style="clear:both" />
		<?php endif; ?>
		<input type="file" name="image_upload"/>
   </td>
</tr>