wpshout-defer-scripts.php

<?php
/*
Plugin Name: WPShout Defer Scripts
Description: Defer Blocking JavaScript
Author: WPShout
Author URI: http://www.wpshout.com
*/

/*	
* Getting script tags
* Thanks http://wordpress.stackexchange.com/questions/54064/how-do-i-get-the-handle-for-all-enqueued-scripts
*/

// add_action( 'wp_print_scripts', 'wsds_detect_enqueued_scripts' );
// function wsds_detect_enqueued_scripts() {
// 	global $wp_scripts;
// 	foreach( $wp_scripts->queue as $handle ) :
// 		echo $handle . ' | ';
// 	endforeach;
// }


/*	
* Deferring and asyncing scripts
* Thanks http://scottnelle.com/756/async-defer-enqueued-wordpress-scripts/
*/

// DEFER internal scripts
add_filter( 'script_loader_tag', 'wsds_defer_scripts', 10, 3 );
function wsds_defer_scripts( $tag, $handle, $src ) {

	// The handles of the enqueued scripts we want to defer
	$defer_scripts = array( 
		'prismjs',
		'admin-bar',
		'et_monarch-ouibounce',
		'et_monarch-custom-js',
		'wpshout-js-cookie-demo',
		'cookie',
		'wpshout-no-broken-image',
		'goodbye-captcha-public-script',
		'devicepx',
		'search-box-value',
		'page-min-height',
		'kamn-js-widget-easy-twitter-feed-widget',
		'__ytprefs__',
		'__ytprefsfitvids__',
		'jquery-migrate',
		'icegram',
		'disqus',
	);

    if ( in_array( $handle, $defer_scripts ) ) {
        return '<script type="text/javascript" src="' . $src . '" defer="defer"></script>' . "\n";
    }

    return $tag;
}


// ASYNC external scripts
add_filter( 'script_loader_tag', 'wsds_async_scripts', 10, 3 );
function wsds_async_scripts( $tag, $handle, $src ) {

	// The handles of the enqueued scripts we want to async
	$async_scripts = array( 

	);

    if ( in_array( $handle, $async_scripts ) ) {
        return '<script type="text/javascript" src="' . $src . '" async="async"></script>' . "\n";
    }

    return $tag;
}