Randomly update posts content in database WP

update_posts_content.php

<?php
/**
 * Front to the WordPress application. This file doesn't do anything, but loads
 * wp-blog-header.php which does and tells WordPress to load the theme.
 *
 * @package WordPress
 */

/**
 * Tells WordPress to load the WordPress theme and output it.
 *
 * @var bool
 */
define('WP_USE_THEMES', false);

/** Loads the WordPress Environment and Template */
require_once( dirname(__FILE__) . '/wp-load.php' );

function update_descriptions( $descriptions, $except = array() ) {
	global $wpdb;

	if( empty( $descriptions ) ) return;

	$q = "
		SELECT ID
		FROM $wpdb->posts
		WHERE post_type = 'product' 
		";

	if( ! empty( $except ) ) {
		$q .= "AND ID NOT IN( " .implode(',', $except) . " )";
	}

	echo $q . '<br>';

	$products = $wpdb->get_results( $q );

	if( empty( $products ) ) return;

	$_i = 0;
	$_num = count( $descriptions );

	foreach ( $products as $product ) {
		echo $product->ID . '<br>';

		$wpdb->update( 
			$wpdb->posts, 
			array( 
				'post_content' => $descriptions[ $_i ]
			), 
			array( 'ID' => $product->ID ), 
			array( 
				'%s'
			), 
			array( '%d' ) 
		);

		$_i++;
		if( $_i >= $_num ) $_i = 0;
	}
	

}

$descriptions = array(
	'second',
	'fourth',
	'first',
	'fifth'
);

$exceptions = array( 15, 37, 53 );

update_descriptions( $descriptions, $exceptions );