WP - bulk update post meta

bulk_post_meta_update.php

<?php
function _run_once(){
    $posts = get_posts(array(
    		'numberposts' => -1,
    		'post_type' => 'place'
    	) 
   	);

    foreach($posts as $p) :  
        // $meta = get_post_meta($p->ID, 'advertiser_type',true);
        //remove the meta key
        update_post_meta( $p->ID, 'advertiser_type', 0, '' );
    endforeach; 
}
// _run_once();