Remove all array elements except what I want?

Question

I have controller that takes post parameters from HTML form, it will then send them to model that will insert the array into Cassandra database.

It is SQLInjection proof

Answer 1

You are looking for array_intersect:

$good = ['parent_id', 'type', 'title', 'body', 'tags'];
$post = ['parent_id', 'type', 'title', 'body', 'tags', 'one', 'two', 'three'];

print_r(array_intersect($good, $post));

See it in action.

Of course this specific example does not make much sense because it works on array values, but there is also array_intersect_key that does the same based on keys.

Answer 2

This will output the same as $post_allowed. What it does is only allow the values in $post_input that are also present in $post_allow.

$post_allowed = ['parent_id', 'type', 'title', 'body', 'tags'];
$post_input   = ['parent_id', 'type', 'title', 'body', 'tags', 'one', 'two', 'three'];
$post = array_intersect($post_input, $post_allowed);