Passing an array to a query using a WHERE clause

Question

Given an array of ids $galleries = array(1,2,5) I want to have a SQL query that uses the values of the array in its WHERE clause like:

Answer 1

We can use this "WHERE id IN" clause if we filter the input array properly. Something like this:

$galleries = array();

foreach ($_REQUEST['gallery_id'] as $key => $val) {
    $galleries[$key] = filter_var($val, FILTER_SANITIZE_NUMBER_INT);
}

Like the example below:

$galleryIds = implode(',', $galleries);

I.e. now you should safely use $query = "SELECT * FROM galleries WHERE id IN ({$galleryIds})";