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CHAPTER 10 • WORKING WITH THE FILE AND OPERATING SYSTEMwww.it-ebooks.infoThis returns the following:Partition: /usr (Allocated: 36716.00 MB. Used: 32327.61 MB.)Retrieving a Directory SizePHP doesn’t currently offer a standard function for retrieving the total size of a directory, a task moreoften required than retrieving total disk space (see disk_total_space() in the previous section). Andalthough you could make a system-level call to du using exec() or system() (both of which areintroduced in the later section “PHP’s Program Execution Functions”), such functions are often disabledfor security reasons. An alternative solution is to write a custom PHP function that is capable of carryingout this task. A recursive function seems particularly well-suited for this task. One possible variation isoffered in Listing 10-1.■ Note The Unix du command will summarize disk usage of a file or a directory. See the appropriate manual pagefor usage information.Listing 10-1. Determining the Size of a Directory’s Contents