php绝对路径与相对路径（PHP absolute path and relative path）.docVIP

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php绝对路径与相对路径（PHP absolute path and relative path）.doc

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php绝对路径与相对路径（PHP absolute path and relative path）

php绝对路径与相对路径（PHP absolute path and relative path） Introduction： Contains the path on PERL and PHP is always a difficult problem, is mainly related with the operating system and the WEB server, it is intelligent to solve the routing problem. Compared with PERL, the path of the PHP is much better, it is much easier to solve, because of the relative path to the PHP anywhere in PHP program can be used, but not like PERL must lead to graft is extremely complex with the absolute path in some of the statements in the. Based on this, in PHP, I designed an absolute safe solution, as follows. Principle： Use a relative path, but the absolute path in the relative path (around a bit, you can guarantee a detailed), portability, two can be easily modified, three is the formulation and the structure is clear, easy to expand. Step by step: 1, first determine the root directory of a program, that is the file system of the virtual directory is not under the WEB server, but the relative path generally the subdirectories and URL virtual directory is the same. 2, the root directory in the program defined under each sub directory (not necessarily each, according to the need) to establish a settings.php, which define a variable or constant (constant is better, because the scope is relatively large), such as APPROOT, but the APPROOT is not an absolute path, but the directory the relative path to the root directory you specify the program. All program entrance file 3, under the directory (i.e. the first contains other files, or is allowed to browse directly in the browser file) in the first sentence written on require_once (settings.php);, but note that all of the included file is best not to add this sentence -- it can also, because you can write if in settings.php (! Defined (APPROOT)) define (APPROOT,../..); this kind of statement to prevent redefinition. 4, if you want to include other files, either directly or indirectly included, can be written in include (APPROOT.$path), where $path i