License

php.js is dual licensed under the MIT and GPL licenses.

This means you may use php.js under the terms of either the MIT License or the Gnu General Public License (GPL) Version 2.

The MIT license allows you to use the library as you see fit (even in commercial projects) as long as you redistribute original the license with it. You don't need to open up your modifications per se, but obviously that would be greatly appreciated and ensure you won't lose your changes after you upgrade.

The GPL license makes it compatible with other GPL projects.

/* 
 * More info at: http://phpjs.org
 * 
 * This is version: 3.26
 * php.js is copyright 2011 Kevin van Zonneveld.
 * 
 * Portions copyright Brett Zamir (http://brett-zamir.me), Kevin van Zonneveld
 * (http://kevin.vanzonneveld.net), Onno Marsman, Theriault, Michael White
 * (http://getsprink.com), Waldo Malqui Silva, Paulo Freitas, Jack, Jonas
 * Raoni Soares Silva (http://www.jsfromhell.com), Philip Peterson, Legaev
 * Andrey, Ates Goral (http://magnetiq.com), Alex, Ratheous, Martijn Wieringa,
 * Rafał Kukawski (http://blog.kukawski.pl), lmeyrick
 * (https://sourceforge.net/projects/bcmath-js/), Nate, Philippe Baumann,
 * Enrique Gonzalez, Webtoolkit.info (http://www.webtoolkit.info/), Carlos R.
 * L. Rodrigues (http://www.jsfromhell.com), Ash Searle
 * (http://hexmen.com/blog/), Jani Hartikainen, travc, Ole Vrijenhoek,
 * Erkekjetter, Michael Grier, Rafał Kukawski (http://kukawski.pl), Johnny
 * Mast (http://www.phpvrouwen.nl), T.Wild, d3x,
 * http://stackoverflow.com/questions/57803/how-to-convert-decimal-to-hex-in-javascript,
 * Rafał Kukawski (http://blog.kukawski.pl/), stag019, pilus, WebDevHobo
 * (http://webdevhobo.blogspot.com/), marrtins, GeekFG
 * (http://geekfg.blogspot.com), Andrea Giammarchi
 * (http://webreflection.blogspot.com), Arpad Ray (mailto:arpad@php.net),
 * gorthaur, Paul Smith, Tim de Koning (http://www.kingsquare.nl), Joris, Oleg
 * Eremeev, Steve Hilder, majak, gettimeofday, KELAN, Josh Fraser
 * (http://onlineaspect.com/2007/06/08/auto-detect-a-time-zone-with-javascript/),
 * Marc Palau, Kevin van Zonneveld (http://kevin.vanzonneveld.net/), Martin
 * (http://www.erlenwiese.de/), Breaking Par Consulting Inc
 * (http://www.breakingpar.com/bkp/home.nsf/0/87256B280015193F87256CFB006C45F7),
 * Chris, Mirek Slugen, saulius, Alfonso Jimenez
 * (http://www.alfonsojimenez.com), Diplom@t (http://difane.com/), felix,
 * Mailfaker (http://www.weedem.fr/), Tyler Akins (http://rumkin.com), Caio
 * Ariede (http://caioariede.com), Robin, Kankrelune
 * (http://www.webfaktory.info/), Karol Kowalski, Imgen Tata
 * (http://www.myipdf.com/), mdsjack (http://www.mdsjack.bo.it), Dreamer,
 * Felix Geisendoerfer (http://www.debuggable.com/felix), Lars Fischer, AJ,
 * David, Aman Gupta, Michael White, Public Domain
 * (http://www.json.org/json2.js), Steven Levithan
 * (http://blog.stevenlevithan.com), Sakimori, Pellentesque Malesuada,
 * Thunder.m, Dj (http://phpjs.org/functions/htmlentities:425#comment_134018),
 * Steve Clay, David James, Francois, class_exists, nobbler, T. Wild, Itsacon
 * (http://www.itsacon.net/), date, Ole Vrijenhoek (http://www.nervous.nl/),
 * Fox, Raphael (Ao RUDLER), Marco, noname, Mateusz "loonquawl" Zalega, Frank
 * Forte, Arno, ger, mktime, john (http://www.jd-tech.net), Nick Kolosov
 * (http://sammy.ru), marc andreu, Scott Cariss, Douglas Crockford
 * (http://javascript.crockford.com), madipta, Slawomir Kaniecki,
 * ReverseSyntax, Nathan, Alex Wilson, kenneth, Bayron Guevara, Adam Wallner
 * (http://web2.bitbaro.hu/), paulo kuong, jmweb, Lincoln Ramsay, djmix,
 * Pyerre, Jon Hohle, Thiago Mata (http://thiagomata.blog.com), lmeyrick
 * (https://sourceforge.net/projects/bcmath-js/this.), Linuxworld, duncan,
 * Gilbert, Sanjoy Roy, Shingo, sankai, Oskar Larsson Högfeldt
 * (http://oskar-lh.name/), Denny Wardhana, 0m3r, Everlasto, Subhasis Deb,
 * josh, jd, Pier Paolo Ramon (http://www.mastersoup.com/), P, merabi, Soren
 * Hansen, Eugene Bulkin (http://doubleaw.com/), Der Simon
 * (http://innerdom.sourceforge.net/), echo is bad, Ozh, XoraX
 * (http://www.xorax.info), EdorFaus, JB, J A R, Marc Jansen, Francesco, LH,
 * Stoyan Kyosev (http://www.svest.org/), nord_ua, omid
 * (http://phpjs.org/functions/380:380#comment_137122), Brad Touesnard, MeEtc
 * (http://yass.meetcweb.com), Peter-Paul Koch
 * (http://www.quirksmode.org/js/beat.html), Olivier Louvignes
 * (http://mg-crea.com/), T0bsn, Tim Wiel, Bryan Elliott, Jalal Berrami,
 * Martin, JT, David Randall, Thomas Beaucourt (http://www.webapp.fr), taith,
 * vlado houba, Pierre-Luc Paour, Kristof Coomans (SCK-CEN Belgian Nucleair
 * Research Centre), Martin Pool, Kirk Strobeck, Rick Waldron, Brant Messenger
 * (http://www.brantmessenger.com/), Devan Penner-Woelk, Saulo Vallory, Wagner
 * B. Soares, Artur Tchernychev, Valentina De Rosa, Jason Wong
 * (http://carrot.org/), Christoph, Daniel Esteban, strftime, Mick@el, rezna,
 * Simon Willison (http://simonwillison.net), Anton Ongson, Gabriel Paderni,
 * Marco van Oort, penutbutterjelly, Philipp Lenssen, Bjorn Roesbeke
 * (http://www.bjornroesbeke.be/), Bug?, Eric Nagel, Tomasz Wesolowski,
 * Evertjan Garretsen, Bobby Drake, Blues (http://tech.bluesmoon.info/), Luke
 * Godfrey, Pul, uestla, Alan C, Ulrich, Rafal Kukawski, Yves Sucaet,
 * sowberry, Norman "zEh" Fuchs, hitwork, Zahlii, johnrembo, Nick Callen,
 * Steven Levithan (stevenlevithan.com), ejsanders, Scott Baker, Brian Tafoya
 * (http://www.premasolutions.com/), Philippe Jausions
 * (http://pear.php.net/user/jausions), Aidan Lister
 * (http://aidanlister.com/), Rob, e-mike, HKM, ChaosNo1, metjay, strcasecmp,
 * strcmp, Taras Bogach, jpfle, Alexander Ermolaev
 * (http://snippets.dzone.com/user/AlexanderErmolaev), DxGx, kilops, Orlando,
 * dptr1988, Le Torbi, James (http://www.james-bell.co.uk/), Pedro Tainha
 * (http://www.pedrotainha.com), James, Arnout Kazemier
 * (http://www.3rd-Eden.com), Chris McMacken, gabriel paderni, Yannoo,
 * FGFEmperor, baris ozdil, Tod Gentille, Greg Frazier, jakes, 3D-GRAF, Allan
 * Jensen (http://www.winternet.no), Howard Yeend, Benjamin Lupton, davook,
 * daniel airton wermann (http://wermann.com.br), Atli Þór, Maximusya, Ryan
 * W Tenney (http://ryan.10e.us), Alexander M Beedie, fearphage
 * (http://http/my.opera.com/fearphage/), Nathan Sepulveda, Victor, Matteo,
 * Billy, stensi, Cord, Manish, T.J. Leahy, Riddler
 * (http://www.frontierwebdev.com/), Rafał Kukawski, FremyCompany, Matt
 * Bradley, Tim de Koning, Luis Salazar (http://www.freaky-media.com/), Diogo
 * Resende, Rival, Andrej Pavlovic, Garagoth, Le Torbi
 * (http://www.letorbi.de/), Dino, Josep Sanz (http://www.ws3.es/), rem,
 * Russell Walker (http://www.nbill.co.uk/), Jamie Beck
 * (http://www.terabit.ca/), setcookie, Michael, YUI Library:
 * http://developer.yahoo.com/yui/docs/YAHOO.util.DateLocale.html, Blues at
 * http://hacks.bluesmoon.info/strftime/strftime.js, Ben
 * (http://benblume.co.uk/), DtTvB
 * (http://dt.in.th/2008-09-16.string-length-in-bytes.html), Andreas, William,
 * meo, incidence, Cagri Ekin, Amirouche, Amir Habibi
 * (http://www.residence-mixte.com/), Luke Smith (http://lucassmith.name),
 * Kheang Hok Chin (http://www.distantia.ca/), Jay Klehr, Lorenzo Pisani,
 * Tony, Yen-Wei Liu, Greenseed, mk.keck, Leslie Hoare, dude, booeyOH, Ben
 * Bryan
 * 
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL KEVIN VAN ZONNEVELD BE LIABLE FOR ANY CLAIM, DAMAGES
 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */