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The php is the language of choice for most of the web developers as it is free, secure and easy to learn. It is like a c language but intended for dynamic web development. When you develop a php code, you should keep following point in mind:
Seperate your code, content and presentation of your document.
This is most important. Do do not mix all the languages in just one page otherwise you will not be able to maintain your site as i t increases.For example, use css for presentation, xhtml for content and php for dynamic control and your php code should be in a seperate file. Although you can embed it in xhtml page but it will be more appropriate, if you just call functions and your code is in seperate file. It will help to maintain code and change it whenever necessary.
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