I am trying to require my "library" files from php files in different folders, but it gives errors when trying to access them from a subfolder. For example I have such a directory:
+ home
- file1.php
++ subfolder
- file2.php
++ libraries
- code_generator.php
- database_library.php
code_generator.php also depends on the other library:
(LINE 25) require_once(realpath("./libraries/database_library.php"));
//this works fine when called from file1.php, but not from file2.php
I try to call code_generator from ./subfolder/file2.php like:
chmod("../libraries/codegenerator.php", 0777); // for the error at the end of this question
require_once("../libraries/code_generator.php");
When I run file2.php, it yields 2 errors:
**Warning**: require_once(C:\xampp\htdocs\home\subfolder): failed to open stream: Permission denied in C:\xampp\htdocs\home\libraries\code_generator.php on line 25
**Fatal error**: require_once(): Failed opening required '' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\home\libraries\code_generator.php on line 25
*line 25 is require_once(realpath("./libraries/database_library.php"));
The error message reads:
Warning: require_once(C:\xampp\htdocs\home\subfolder): failed to open stream:
And:
Failed opening required ''
Error messages never lie (well, almost never), therefore you are calling:
require_once('');
Realpath will return false if you pass it a path to a file that doesn't exist:
$return = realpath('this/doesnt/exist.foo'); // $return is false
Therefore, the argument passed to realpath doesn't refer to a file, which is the reason the path doesn't work.
If you remove the use of realpath, you'll find that the error message is probably obvious. At a guess you're trying to include C:\xampp\htdocs\home\subfolder\libraries\database_library.php
- because there is a missing .
in this:
line 25 is
require_once(realpath("./libraries/database_library.php"));
If instead you just define a root path:
define('ROOT', 'C:\xampp\htdocs\home\\');
Then you can use this constant with absolute confidence that these sort of problems wont occur:
require_once(ROOT . "libraries/database_library.php");
And if you do get the path wrong, the error message will make it obvious what the problem is.