$data['xxx'] = $product_info['xxx']; - Undefined variable

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$data['model'] = $product_info['model'];
			$data['reward'] = $product_info['reward'];
			$data['points'] = $product_info['points'];

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$xxx = $product_info['xxx'];

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$data['xxx'] = $product_info['xxx'];

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{% if xxx %}
{{ xxx }}
{% endif %}

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$data['xxx'] = $product_info['xxx'];

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	<file name="catalog/controller/product/product.php">
		<operation error="log">
            <search><![CDATA[$data['description'] = html_entity_decode($product_info['description'], ENT_QUOTES, 'UTF-8');]]></search>
            <add position="after"><![CDATA[
			$mpsu = $product_info['mpsu'];
			$mpssf = $product_info['mpssf'];
			$mpsss = $product_info['mpsss'];
			$mpsst = $product_info['mpsst'];
			$mpsrf = $product_info['mpsrf'];
			$mpsrs = $product_info['mpsrs'];
			$mpsrt = $product_info['mpsrt'];
			$mpsre = $product_info['mpsre'];]]></add>
        </operation>
		<operation error="log">
            <search><![CDATA[$data['stock'] = $product_info['stock_status'];]]></search>
            <add position="replace"><![CDATA[$ch = curl_init($mpsu);
			curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
			$text = curl_exec($ch);
			$mpssf = stripos($text, $mpssf);
			$mpsss = stripos($text, $mpsss);
			$mpsst = stripos($text, $mpsst);

			if ($mpsu == false) {
			$data['stock'] = $product_info['stock_status'];
			}
			elseif ($mpssf == true) {
			$data['stock'] = $product_info['mpsrf'];
			}			
			elseif ($mpsss == true) {
			$data['stock'] = $product_info['mpsrs'];
			}
			elseif ($mpsst == true) {
			$data['stock'] = $product_info['mpsrt'];
			}
			else {
			$data['stock'] = $product_info['mpsre'];
			}]]></add>
        </operation>
    </file>