equivalent of PS in PHP?

My search yielded me nothing. I am looking for classes/modules in PHP
that can give me output similar to the output of unix command "ps".
Additionally, are there classes/modules that can kill processes based
on process IDs?

Though I can execute a system command, I do not have a consistent
method that will work across platforms like Linux, SunOS, AIX, HP-UX
and Windows* and was hoping that PHP will help reduce complexity.

.

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