Allows you to tail a file using HTTP.
No system commands are executed. Uses native PHP functions only.
This PHP implementation is based on: /usr/bin/tail -F -n 0 '/path/to/file.log'
From man tail:
The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the input.
The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The file is closed and reopened when tail detects that the filename being read from has a new inode number.
If the file being followed does not (yet) exist or if it is removed, tail will keep looking and will display the file from the beginning if and when it is created.
-n 0 starts at the end of the file. tail defaults to a starting location of "-n 10" (cfr. the last 10 lines of the input).
Hence this script will print the output of all new lines. No previous lines are emitted.