How to match data in multidimensional array of post_meta_data?

This is a simple PHP related question (and those are better asked at StackOverflow.com) and you can find if an index exists within a multi-dimensional array by iterating through it and matching.
Something as:

function wpse231889_has_user_voted( $user_id, $post_id ) {
    if ( !empty( ( $voters = get_post_meta( $post_id, 'voter' ) ) ) ) {
        foreach ( $voters as $voter ) {
            if ( !empty( $voter['voter']['post_id'] ) && (int) $user_id == (int) $voter['voter']['post_id'] ) {
                return true;
            }
        }
    } return false;
}

Glad it helped.

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