(PHP 4, PHP 5, PHP 7)
pfsockopen — Open persistent Internet or Unix domain socket connection
pfsockopen ( string $hostname [, int $port = -1 [, int &$errno [, string &$errstr [, float $timeout = ini_get("default_socket_timeout") ]]]] ) : resource This function behaves exactly as fsockopen() with the difference that the connection is not closed after the script finishes. It is the persistent version of fsockopen().
For parameter information, see the fsockopen() documentation.
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https://www.php.net/manual/en/function.pfsockopen.php