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These functions are provided to manipulate any directory.
There is no installation needed to use these functions; they are part of the PHP core.
PHP needs to be configured with --enable-chroot-func option to enable chroot() function.
This extension has no configuration directives defined in php.ini.
PHP: indicates the earliest version of PHP that supports the constant.
PHP: indicates the earliest version of PHP that supports that function.
NOTE: For more functions related to file system, check File System Functions