seancojr

<?php  
/*  
Plugin Name: Add Support for HTTPS  
Plugin URI: http://www.sitepoint.com/crimes-against-wordpress/
Description: Fixes SSL incompatibility in a WordPress site 
Version: 1.0  
Author: Andrew Tetlaw
Author URI: http://awesomebutuseless.com/
License: GPL2  
*/  

seancojr

There are three options (that I know of) for automatically enabling a plugin in new sites.

1. Move the plugin from wp-content/plugins/ to wp-content/mu-plugins/ (MU = Must Use). But then it cannot be deactivated for any site.

2. Click Network Activate instead of Activate to enable it for all sites. I didn't want to use this though because I didn't want to affect existing sites. Also I couldn't work out how to deactivate it for some sites (although I've read this should be possible).

3. Write a plugin (in wp-content/mu-plugins/) with a hook that activates the plugin at creation time. This way it only affects new blogs, can be deactivated easily, and I can also set the default configuration at the same time.

seancojr

    <dict>
        <key>name</key>
        <string>Git Modified Line</string>
        <key>scope</key>
        <string>git.changes.x</string>
        <key>settings</key>
        <dict>
            <key>background</key>
            <string>#272852</string>
        </dict>

seancojr

<?php

/**
 * keeps a user always logged in
 * don't use this on a production site, ever!
 */

add_action('init', 'auto_login');
add_action('admin_init', 'auto_login');
function auto_login() {

seancojr

<?php
/**
 * Plugin Name: Use AddQuicktag on my CPT
 * Plugin URI: http://bueltge.de/
 * Description: Add custom post type 'my_custom_post_type' to AddQuicktag plugin
 * Author: Frank Bültge
 * Version: 0.0.1
 * Licence: GPLv3
 * Author URI: http://bueltge.de
 */

seancojr

<?php
/*
Plugin Name: Disable plugins when doing local dev
Description: If the WP_LOCAL_DEV constant is true, disables plugins that you specify
Version: 0.1
License: GPL version 2 or any later version
Author: Mark Jaquith
Author URI: http://coveredwebservices.com/
*/

seancojr

<?php

/**
* @package JCK_Quick_Jump Modified
* @version 1.3
*/

/*

Plugin Name: Admin Quick Jump Modified

seancojr

<?php

add_action( 'pre_get_posts', 'localtv_posts_and_pages_for_search' );

function localtv_posts_and_pages_for_search( $query ) {
	if ( $query->is_main_query() && $query->is_search() )
		$query->set( 'post_type', array( 'post', 'page' ) );
}

seancojr

<?php

add_action( 'pre_get_posts', 'oomskaap_price_range_limiter' );

function oomskaap_price_range_limiter( $query ) {
	// Only do something if both the start and end values are set in the URL
	if ( empty( $_GET['pricestart'] ) || empty( $_GET['priceend'] ) )
		return;

	// Only modify the main query

seancojr

<?php

# See bigdawggi's comment below for a good combined example

// Pre-3.3
function cf_google_search_kill_wp_search( $where, $query ) {
	global $wp_the_query;

	if(  ! is_admin() && $query->is_search() && $query === $wp_the_query ) {
		$where = ' AND 1=0';