PHP Manual
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pfsockopen

(PHP 3 >= 3.0.7, PHP 4, PHP 5)

pfsockopen --  Open persistent Internet or Unix domain socket connection

Description

resource pfsockopen ( string hostname, int port [, int &errno [, string &errstr [, int timeout]]] )

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().

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