(PHP 4, PHP 5, PHP 7)
posix_getpid — Return the current process identifier
posix_getpid ( ) : int
Return the process identifier of the current process.
Returns the identifier, as an int.
Example #1 Example use of posix_getpid()
<?php echo posix_getpid(); //8805 ?>
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https://www.php.net/manual/en/function.posix-getpid.php