How to use php array with sql IN operator?

Question

I have and array with two values and I want to use it with sql IN operator in select query.

Here is the structure of my table

id comp_id
1   2
2   3
         


        

Answer 1

There are some risks of SQL injection in a few of the previous answers. It might be fine if you are completely certain about $arr being sanitized (and will stay that way). But if you aren't completely sure, you might want to mitigate such risk using $stmt->bindValue. Here is one way of doing it:

# PHP
$in_list = array();
for ($i = 0; $i < count($arr); $i++) {
    $key = 'in_param_' . i;
    $in_list[':' . $key] = array('id' => $arr[$i], 'param' => $key);
}
$keys = implode(', ', array_keys($in_list));

// Your SQL ...
$sql = "SELECT * FROM table where id IN ($keys)";


foreach ($in_list as $item) {
    $stmt->bindValue($item['param'], $item['id'], PDO::PARAM_INT);
}
$stmt = $this->getConnection()->prepare($sql)->execute();