dansajin/Queue.js

## index.php
<!doctype html>
<html>
    <head>
        <!-- some html -->

        <script>
            // define a queue function with cached callbacks
            window.queue = window.queue || function(callback){
                (queue.callbacks = queue.callbacks || []).push(callback)
            };
        </script>
    </head>
    <body>
        <!-- some html -->

        <script>
            // queue until script loads or execute immediately if script is loaded
            queue(function(){
                // some js with server side parsing
                var name = '<?= htmlspecialchars($user->name) ?>';
            });
        </script>
        <!-- more html -->

        <!-- allow modern browsers to preload the script but do not block old browsers -->
        <script defer src="Queue.js"></script>
    </body>
</html>

## Queue.js
'use strict';

function Queue(){
    this.push = function(){
        for (var i = 0, len = arguments.length; i < len; i++){
            if (typeof arguments[i] !== 'function'){
                throw new TypeError('Argument must be a function.')
            }
            arguments[i]()
        }
    }
};

// get existing queue callbacks
var oldQueue = window.queue.callbacks;

// create a new queue object which replaces original [].push with new Queue().push
window.queue.callbacks = new Queue();

// execute all of the queued up callbacks
window.queue.callbacks.push.apply(window.queue.callbacks, oldQueue);
	<!doctype html>
	<html>
	<head>
	<!-- some html -->

	<script>
	// define a queue function with cached callbacks
	window.queue = window.queue \|\| function(callback){
	(queue.callbacks = queue.callbacks \|\| []).push(callback)
	};
	</script>
	</head>
	<body>
	<!-- some html -->

	<script>
	// queue until script loads or execute immediately if script is loaded
	queue(function(){
	// some js with server side parsing
	var name = '<?= htmlspecialchars($user->name) ?>';
	});
	</script>
	<!-- more html -->

	<!-- allow modern browsers to preload the script but do not block old browsers -->
	<script defer src="Queue.js"></script>
	</body>
	</html>
	'use strict';

	function Queue(){
	this.push = function(){
	for (var i = 0, len = arguments.length; i < len; i++){
	if (typeof arguments[i] !== 'function'){
	throw new TypeError('Argument must be a function.')
	}
	arguments[i]()
	}
	}
	};

	// get existing queue callbacks
	var oldQueue = window.queue.callbacks;

	// create a new queue object which replaces original [].push with new Queue().push
	window.queue.callbacks = new Queue();

	// execute all of the queued up callbacks
	window.queue.callbacks.push.apply(window.queue.callbacks, oldQueue);