TAILIEUCHUNG - PHP and MySQL Web Development - P96

PHP and MySQL Web Development - P96: PHP and MySQL Web Development teaches the reader to develop dynamic, secure, commercial Web sites. Using the same accessible, popular teaching style of the first edition, this best-selling book has been updated to reflect the rapidly changing landscape of MySQL and PHP. | Implementing Version Control 447 supply a controlled interface for accessing and sharing your code and possibly documentation . Imagine a situation in which you try to improve some code but instead accidentally break it and can t roll it back to the way it was no matter how hard you try. Or you or a client decides that an earlier version of the site was better. Or you need to go back to a previous version for legal reasons. Imagine another situation in which two members of your programming team want to work on the same file. They might both open and edit the file at the same time overwriting each other s changes. They might both have a copy that they work on locally and change in different ways. If you have thought about these things happening one programmer might be sitting around doing nothing while she waits for another to finish editing a file. You can solve all these problems with a version control system. These systems can track changes to each file in the repository so that you can see not only the current state of a file but also how it looked at any given time in the past. This feature allows you to roll back broken code to a known working can tag a particular set of file instances as a release version meaning that you can continue development on the code but get access to a copy of the currently released version at any time. Version control systems also assist multiple programmers in working on code together. Each programmer can get a copy of the code in the repository called checking it out and when they make changes these changes can be merged back into the repository checked in or committed .Version control systems can therefore track who made each change to a system. These systems usually have a facility for managing concurrent updates. What this means is that two programmers can actually modify the same file at the same time. For example imagine that John and Mary have both checked out a copy of the most recent release of their project. .

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