(PHP 4, PHP 5, PHP 7)
getmypid — Gets PHP's process ID
getmypid ( ) : int
Gets the current PHP process ID.
Returns the current PHP process ID, or false
on error.
Process IDs are not unique, thus they are a weak entropy source. We recommend against relying on pids in security-dependent contexts.
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https://www.php.net/manual/en/function.getmypid.php