如何删除prev foreach数据

Question

foreach ($products as $product) {
    echo "SIZE (X х Y х Z),mm: ";
    $myf = [8,4,5]; // my custom fields is X,Y,Z and print it           
    foreach($product->customfields as $field){ // get fields
        if (in_array($field->virtuemart_custom_id, $myf)) {
            $output[] = $field->customfield_value;
        }
    }
    echo implode('x', $output); // is getting re-assigned each time. So whatever the problem is, it is a result of whatever $output is getting assigned with.
}

in second product I have this data from first product

SIZE (X х Y х Z),mm: 280x260x350x290x325x435 (need 290x325x435 only!). on each products I have all previous XYZ data from all previous products.

Very mistiq. pls help print data 1 XYZ to 1 product only :)

I thinks implode not correct method

Answer 1

Just after this line

echo implode('x', $output);

Add this line

unset($output);

What this does is this will reset your $output to an empty array. No longer your $output has the previous data.