bootstrap.php

<?php
// Copyright (c) 2016-2017 Andrea Zanellato
// This file may be used and distributed under the terms of the public license.

class YellowBootstrap
{
	const Version = "0.0.4";
	var $yellow;

	// Handle initialisation
	function onLoad($yellow)
	{
		$this->yellow = $yellow;
		if(!$this->yellow->config->isExisting("jqueryCdn"))
		{
			$this->yellow->config->setDefault("jqueryCdn",
				"https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.1/");
		}
		$this->yellow->config->setDefault("bootstrapCdnCSS",
			"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/");

		$this->yellow->config->setDefault("bootstrapCdnJS",
			"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/");
	}

	// Handle page extra HTML data
	function onExtra($name)
	{
		$output = NULL;
		if($name == "header")
		{
			$jqCDN = $this->yellow->config->get("jqueryCdn");
			$bsJS  = $this->yellow->config->get("bootstrapCdnJS");
			$bsCSS = $this->yellow->config->get("bootstrapCdnCSS");

			$output .= "<script type=\"text/javascript\" src=\"{$jqCDN}jquery.min.js\"></script>\n";
			$output .= "<script type=\"text/javascript\" src=\"{$bsJS}bootstrap.min.js\"></script>\n";
			$output .= "<link rel=\"stylesheet\" href=\"{$bsCSS}bootstrap.min.css\">\n";
		}
		return $output;
	}
}

$yellow->plugins->register("bootstrap", "YellowBootstrap", YellowBootstrap::Version);
?>