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Plugin: Defer Contact Form 7 Scripts

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defer-cf7-scripts.php
PHP
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<?php # -*- coding: utf-8 -*-
declare( encoding = 'UTF-8' );
/**
* Plugin Name: Defer Contact Form 7 Scripts
* Description: Adds <code>defer='defer'</code> to enqueued javascripts.
* Version: 1.0
* Required: 3.3
* Author: Thomas Scholz
* Author URI: http://toscho.de
* License: GPL
* License URI: http://www.gnu.org/copyleft/gpl.html
*
*
* Defer Scripts, Copyright (C) 2011 Thomas Scholz
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
 
! defined( 'ABSPATH' ) and exit;
 
if ( ! function_exists( 'add_defer_to_cf7' ) )
{
function add_defer_to_cf7( $url )
{
if ( // comment the following line out add 'defer' to all scripts
FALSE === strpos( $url, 'contact-form-7' ) or
FALSE === strpos( $url, '.js' )
)
{ // not our file
return $url;
}
// Must be a ', not "!
return "$url' defer='defer";
}
add_filter( 'clean_url', 'add_defer_to_cf7', 11, 1 );
}

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