Add doc about magic constants __FILE__ and __DIR__

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Hypolite Petovan 2017-05-03 10:30:23 -04:00
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commit 96ae2ff224
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@ -99,6 +99,9 @@ Howevever, this tool isn't bullet-proof, and a staging install of Friendica is r
Most of Friendica processes are run in the background, so make sure to turn on your debug log to check for errors that wouldn't show up while simply browsing Friendica.
Check the class file for any magic constant `__FILE__` or `__DIR__`, as their value changed since you moved the class in the file tree.
Most of the time it's used for debugging purposes but there can be instances where it's used to create cache folders for example.
## Related
* [Class autoloading](help/autoloader)