WordPress auto-activate plugins script

install.php

<?php
/*
 * wp-content/install.php
 *
 * This file runs automatically when the WordPress installer is run.
 * Most WordPress functionality will be available to provide the ability
 * to perform any additional actions on installation you would like.
 */


/**
 * Automatically activates plugins in the list after the WordPress installation
 * has called the shutdown hook. 
 *
 * Plugins can be added to the list to auto-activate by using the relative path
 * from the wp-content/plugins folder. E.G: jetpack/jetpack.php
 **/
function activate_plugins_after_wordpress_install() {
    global $pagenow;

    /*  
     * List of plugins to auto-activate
     *
     * Format is relative path from wp-content/plugins.
     * E.G: jetpack/jetpack.php
     */
    $plugins = array(
        'jetpack/jetpack.php',
        'akismet/akismet.php'
    );  

    // Make sure we are on the WordPress install page
    if ( !( 'install.php' == $pagenow && isset( $_REQUEST['step'] ) && 2 == $_REQUEST['step'] ) ) { 
        return;
    }   

    // Get the list of currently active plugins (Most likely an empty array)
    $active_plugins = (array) get_option( 'active_plugins', array() );

    // Add plugins to auto-activate
    foreach ( $plugins as $p ) { 
        // Make sure the plugin is not already listed
        if ( false !== array_search( $p, $active_plugins ) ) { 
            continue; // Whoops, found the plugin already!
        }   

        $active_plugins[] = $p; 
    }   
        
    // Set the new plugin list in WordPress
    update_option( 'active_plugins', $active_plugins );
}

add_action( 'shutdown', 'activate_plugins_after_wordpress_install' );