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I am using require_once like this
require_once('../mycode.php') I am developing a wordpress plugin. My plugin folder is yves-slider where I have a file called yves-slider.php and a folder called admin. Inside admin folder I have a file called admin.php. I want to require file yves-slider.php in my admin.php which is located up one level directory. When I try to use
require_once('../yves-slider.php') it gives me the following error
Warning: require_once(../yves-slider.php): failed to open stream: No such file or directory in C:\xampp\htdocs\wordpress\wp-content\plugins\yves-slider\yves-slider-admin\yves-slider-admin.php on line 4
Fatal error: require_once(): Failed opening required '../yves-slider.php' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\wordpress\wp-content\plugins\yves-slider\yves-slider-admin\yves-slider-admin.php on line 4
Am I doing wrong? I am using XAMPP 3.1, I guess that's the best way to do it.
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The basic difference between require and require_once is require_once will check whether the file is already included or not if it is already included then it won't include the file whereas the require function will include the file irrespective of whether file is already included or not.
include_once will throw a warning, but will not stop PHP from executing the rest of the script. require_once will throw an error and will stop PHP from executing the rest of the script.
If the referenced object is a folder, the function will return the parent folder of that folder. For the current folder of the current file, use $current = dirname(__FILE__); . For a parent folder of the current folder, simply use $parent = dirname(__DIR__); .
The require_once keyword is used to embed PHP code from another file. If the file is not found, a fatal error is thrown and the program stops. If the file was already included previously, this statement will not include it again.
You want to make that relative to the current path the file is in:
require_once __DIR__ . '/../yves-slider.php'; What probably is happening is that the current path PHP looks in is not the path you think it is. If you are curious about what it is (the current path) you could do echo getcwd();.
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