Parse error: syntax error, unexpected '$this' (T_VARIABLE)

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<modification>
<name><![CDATA[<font color="#0000"><b>Ecomteck - Sold Items - Number Bought The Product</font>]]></name>
<version>2.3.0</version>
<link>http://ecomteck.com</link>
<author>ecomteck@gmail.com</author>
<code>ec_sold_items</code>

<file path="catalog/view/theme/*/template/product/product.tpl">
	<operation>
		<search position="replace"><![CDATA[<?php if ($price) { ?>]]></search>
		<add><![CDATA[
			<?php if(isset($sold_items)) { ?>
			<div class="ec_block_sold_items">
				<div><?php echo sprintf($language->get("text_sold_items"), $sold_items); ?></div>
			</div>
			<?php } ?>
			<?php if ($price) { ?>
		]]></add>
	</operation>
</file>
</modification>

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Stock: Pre-Order
This item has been sold: 1 times
This item has been sold: 1 times
$13.90

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Parse error: syntax error, unexpected '$this' (T_VARIABLE), expecting function (T_FUNCTION) in /home/atit/public_html/system/storage/modification/catalog/controller/product/product.php on line 22

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<modification>
	<id>VQMod Ecomteck - Sold Items - Number Bought the product</id>
	<version>1.0.0</version>
	<vqmver>2.3.0</vqmver>
	<author>ecomteck@gmail.com (http://ecomteck.com)</author>
	<file path="catalog/language/*/product/product.php">
	   <operation error="log">
		  <search position="replace"><![CDATA[$_['text_search']              = 'Search';]]></search>
		  <add><![CDATA[
			 $_['text_sold_items'] = '<span class="sold_total_sold">Sold: </span><span class="sold_total_number"><b>%s</b> <span></span></span>';
			 $_['text_search']              = 'Search';
		  ]]></add>
	   </operation>
	</file>
	<file name="catalog/view/theme/*/template/product/product.tpl">
		<operation  error="abort">
			<search position="before"><![CDATA[<?php if ($price) { ?>]]></search>
			<add><![CDATA[
				<?php if(isset($sold_items)) { ?>
				<div class="ec_block_sold_items">
					<div><?php echo sprintf($language->get("text_sold_items"), $sold_items); ?></div>
				</div>
				<?php } ?>
			]]></add>
		</operation>
	</file>
	<file name="catalog/controller/product/product.php">
		<operation  error="abort">
			<search position="before"><![CDATA[public function review() {]]></search>
			<add><![CDATA[
					protected function getTotalBought($product_id, $order_status_id = 0)
					{
						$bought = 0;
						$filter_status = " AND o.order_status_id > 0";
						if($order_status_id ) {
							$filter_status = " AND o.order_status_id IN (".implode(",",$order_status_id).")";
						}
						$query = $this->db->query("SELECT sum(quantity) as `total` FROM `" . DB_PREFIX . "order_product` op
							LEFT JOIN `".DB_PREFIX."order` AS o ON op.order_id = o.order_id WHERE op.product_id = ".$product_id.$filter_status);

						if($query->num_rows){
							return $query->row['total'];
						}
						return 0;
					}
			]]></add>
		</operation>
		<operation  error="abort">
			<search position="after"><![CDATA[if ($product_info) {]]></search>
			<add><![CDATA[
				$data['language'] = $this->language;
				$data['sold_items'] = $this->getTotalBought($product_info['product_id']);
			]]></add>
		</operation>
	</file>
</modification>