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    <p>The way they are usually used, PHP and JavaScript run in entirely different worlds, and are not really comparable. (There <em>is</em> a <a href="http://en.wikipedia.org/wiki/Server-side_JavaScript" rel="nofollow noreferrer">server-side version</a> of JavaScript but it's fair to say it's not especially widespread yet, and doesn't run on standard web hosting.)</p> <p>The security issues you are going to encounter in JavaScript (on the browser) side are very different from what you have to look out for in PHP. </p> <blockquote> <p>I want to know too, if it can be sucessfully used to develop things like forum boards, full web-sites and things like this, as PHP does.</p> </blockquote> <p>No, not with client-side Javascript. For dynamic applications, you will always need some server-side language backing it, be it PHP or some other language like ASP, Python, Ruby, Perl....</p>
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    1. POJavaScript on the server-side like PHP
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    1. CORe *"There is a server-side version of JavaScript but it's fair to say it's not especially widespread yet, and doesn't run on standard web hosting."* IIS is an **incredibly** standard, widespread web hosting platform, and has supported Javascript for, oh, a decade or so. Another very widespread platform is any JVM hosting solution, for which you can write Javascript with Java. It's not *quite* as widespread as PHP yet, but running on IIS and any JVM solution makes it very widely-available and supported indeed.
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    2. CO@T.J. Crowder: But the point is, how many hosts do you know of that support server-side JavaScript right off the bat? Also, there is no standard for server-side JavaScript, so each implementation uses its own libraries and APIs, which is annoying.
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    3. CO@musicfreak: My point is that a lot of people have hosting packages *right now* that support Javascript and they don't even know it. Have an IIS-based hosting package? It supports Javascript on the server, right off the bat. Have a hosting package on Tomcat, Resin, or anything else with a JVM? It supports Javascript, right off the bat. Between those two, I'd say we're looking at more than half the hosting providers out there (because although Apache **dominates** the market, if you look, the vast majority of companies providing Apache hosting *also* provide IIS or JVM hosting).
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