A developer is only expert in one or two web languages

It is possible to distinguish developers by sector, those skilled in the software business, and those specialized in the web, and the sectors of information and communications technology that matters to it two-thirds of developers sectoral activities.
The Web developer is responsible for constituting various sources of Internet programming languages ​​codes, composed between other markup languages ​​such as HTML, CSS ... interpreted languages ​​such consisting of PHP, ASP or JavaScript, or object-oriented languages ​​made up mainly of AJAX, Java, C ++, Python or Ruby.

A developer needs to know several languages ​​but ...

A developer is primarily an expert of computer languages. He must master one or more languages ​​and the adjoining concepts (eg the concept of inheritance for an object oriented language). Often the technical knowledge stem from the application domain. For example in the Web development framework the required skills are specific in languages ​​(HTML, CSS, JavaScript, PHP...) and software (Frontpage or Dreamweaver ...).
For the hardcore development, it is often good to know a statically typed language and low level like C or C ++, in tandem with a "script" language like Python, Ruby or Perl. Where the first is strong and will serve coding the heart of programs, the second allows you to work these pieces of code together, writing tests and all the ancillary code of a project, very quickly. This kind of tandem languages ​​(and sometimes wise choice to use one or the other for that part of the project) can efficiently produce quality code. For the web, you must often use a "business" language, which is the server side work, and a scripting language that will run in the browser.
For the first, PHP is the most common but there are also Python, Perl or Ruby ( "scripting languages" which do fine job). For the second, browser side, there is almost no choice, and that's JavaScript is used.
Knowing bottom 3 languages, that's a lot. Knowing perfectly see 1 see 2 programming languages ​​(more tools), this is what most developers make.

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