$fields = $values ​​= [];This code cannot be defined and keeps reporting errors. The teacher’s source code also reports errors and cannot be executed. How can I solve this problem?

Question

Answer 1

if ($type == 'insert') {
    $fields = $values = [];
    foreach ($data as $key => $value) {
        // 键值存入$fields
        $fields[] = $key;
        // 值存入$values;
        $values[] = $value;
    }
}

Answer 2

The foreach you wrote is $key=>$value, and $val is used for assignment below. This is definitely wrong.