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[PHP] Wait till file contents changed


I am trying to figure out a way to do the following:

I have a cli script that has to wait untill the contents of a file has changed
from a "0" to a "1".

If it is a "0", the script must wait, if it is changed to a "1" the script must
continue. The "0" and "1" is written by a BASH script. 

When the bash script is run , it echo's a "0" into the file to tell php that the
process has started and php should wait untill the process is finished which
occurs when the BASH script echo's a "1" into the same file.

Any pointers?

Thank you


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