Message:
PHP Warning: fopen(cache/____________.cache): failed to open stream: File name too long in test.php on line 12
Error type: warning
Symptoms:
Call to function fopen() fails for some files.
Cause:
The file system has a limit for the file names, for Linux (ext) is 256 characters, trying to create a file longer than that will fail and issue the warning above.
Fix:
Shorten the filename to have less than 256 characters. Use hash functions if you can’t just truncate the file name.