SunshinePHP Developer Conference 2015

socket_close

(PHP 4 >= 4.1.0, PHP 5)

socket_closeCierra un recurso socket

Descripción

void socket_close ( resource $socket )

socket_close() cierra el recurso socket dado por socket. Esta función es específica para sockets y no se puede usar en otros tipos de recursos.

Parámetros

socket

Un recurso socket válido creado con socket_create() o socket_accept().

Valores devueltos

No devuelve ningún valor.

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User Contributed Notes 2 notes

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aeolianmeson at NOSPAM dot blitzeclipse dot com
8 years ago
PHP: 5.1.4
Summary: close() does not relinquish socket immediately.

With the BSD socket implementation (which is the socket interface used by PHP), a socket_close() may close the socket, but there may yet be data to send. Until the data is sent, the port will not be available. Therefore, all further bindings attempted on that port will not be acceptable due to the 'port can not be reused' (the approximate message, anyway) error. Ordinarily, if the REUSABLE socket option is set, the only thing that will raise such an error is a binding to a specific IP/PORT combination that is already bound.

To avoid this problem, you must tell it to delay returning until the port either sends the rest of its data, or times-out in doing it. This is done via the SO_LINGER option. To set this option, it requires an array of two elements: the first indicates whether a linger is required on any data before the shutdown completes, and the second indicates whether we actually linger. If we set a nonzero to the first while setting a zero to the second, we would simply drop whatever data is waiting in the buffer, and close the socket. To tell it simply to wait on the data to be sent, you send a non-zero for both: array(1, 1).

Note that if you have indicated not to block (socket_set_nonblock()), it will simply exit no matter what, much like it usually would. In this case it bursts an EWOULDWAIT flag, but since I don't think we have access to these socket flags in PHP, one should re-enable blocking right before they set the linger and quit.

    // These commands get fed straight through to the Unix socket libraries.. That's why they're a little more C-like.
    $arrOpt = array('l_onoff' => 1, 'l_linger' => 1);
    socket_set_block($this->Socket);
    socket_set_option($this->Socket, SOL_SOCKET, SO_LINGER, $arrOpt);
    socket_close($this->Socket);
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0
chaos
12 years ago
Sometimes it seems that you have to shutdown() a socket before you can close() it. I experienced that while making a chatserver in PHP with this cool socket extension.
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