I don't see what could cause this problem with a file as small as 1.4 kB.
As written above, errors can occur with very large log files using the PHP file() command if you exceed php.ini's memory_limit.
I am currently working on this potential problem using shell_exec() and the find /c /v "" file.log and powershell commands.
Quit Wampserver and delete all files in wamp64/logs/ and wamp64/tmp/.
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