function.msg-receive.html

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><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
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><TR
><TH
COLSPAN="3"
ALIGN="center"
>Руководство по PHP</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="bottom"
><A
HREF="function.msg-get-queue.html"
ACCESSKEY="P"
>Пред.</A
></TD
><TD
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><TD
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>След.</A
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="function.msg-receive"
></A
>msg_receive</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN163695"
></A
><P
>    (PHP 4 &#62;= 4.3.0, PHP 5)</P
>msg_receive&nbsp;--&nbsp;
     Receive a message from a message queue
    </DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN163698"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>msg_receive</B
> ( resource queue, int desiredmsgtype, int &#38;msgtype, int maxsize, mixed &#38;message [, bool unserialize [, int flags [, int &#38;errorcode]]] )<BR
></BR
><P
>&#13;     <B
CLASS="function"
>msg_receive()</B
> will receive the first message from the
     specified <VAR
CLASS="parameter"
>queue</VAR
> of the type specified by
     <VAR
CLASS="parameter"
>desiredmsgtype</VAR
>.
     The type of the message that was received will be stored in
     <VAR
CLASS="parameter"
>msgtype</VAR
>.
     The maximum size of message to be accepted is specified by the
     <VAR
CLASS="parameter"
>maxsize</VAR
>; if the message in the queue is larger
     than this size the function will fail (unless you set
     <VAR
CLASS="parameter"
>flags</VAR
> as described below).
     The received message will be stored in <VAR
CLASS="parameter"
>message</VAR
>,
     unless there were errors receiving the message, in which case the
     optional <VAR
CLASS="parameter"
>errorcode</VAR
> will be set to the value of the
     system errno variable to help you identify the cause.
    </P
><P
>&#13;     If <VAR
CLASS="parameter"
>desiredmsgtype</VAR
> is 0, the message from the front
     of the queue is returned. If <VAR
CLASS="parameter"
>desiredmsgtype</VAR
> is
     greater than 0, then the first message of that type is returned.
     If <VAR
CLASS="parameter"
>desiredmsgtype</VAR
> is less than 0, the first
     message on the queue with the lowest type less than or equal to the
     absolute value of <VAR
CLASS="parameter"
>desiredmsgtype</VAR
> will be read.
     If no messages match the criteria, your script will wait until a suitable
     message arrives on the queue.  You can prevent the script from blocking
     by specifying <TT
CLASS="constant"
><B
>MSG_IPC_NOWAIT</B
></TT
> in the 
     <VAR
CLASS="parameter"
>flags</VAR
> parameter.
    </P
><P
>&#13;     <VAR
CLASS="parameter"
>unserialize</VAR
> defaults to <TT
CLASS="constant"
><B
>TRUE</B
></TT
>; if it is set to
     <TT
CLASS="constant"
><B
>TRUE</B
></TT
>, the message is treated as though it was serialized using the same
     mechanism as the session module.  The message will be unserialized and
     then returned to your script.  This allows you to easily receive arrays
     or complex object structures from other PHP scripts, or if you are using
     the WDDX serializer, from any WDDX compatible source.
     If <VAR
CLASS="parameter"
>unserialize</VAR
> is <TT
CLASS="constant"
><B
>FALSE</B
></TT
>, the message will be
     returned as a binary-safe string.
    </P
><P
>&#13;     The optional <VAR
CLASS="parameter"
>flags</VAR
> allows you to pass flags to the
     low-level msgrcv system call.  It defaults to 0, but you may specify one
     or more of the following values (by adding or ORing them together).
     <DIV
CLASS="table"
><A
NAME="AEN163751"
></A
><P
><B
>Таблица 1. Flag values for msg_receive</B
></P
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><TBODY
><TR
><TD
><TT
CLASS="constant"
><B
>MSG_IPC_NOWAIT</B
></TT
></TD
><TD
>If there are no messages of the
          <VAR
CLASS="parameter"
>desiredmsgtype</VAR
>, return immediately and do not
          wait.  The function will fail and return an integer value
          corresponding to ENOMSG.
         </TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>MSG_EXCEPT</B
></TT
></TD
><TD
>Using this flag in combination with a
          <VAR
CLASS="parameter"
>desiredmsgtype</VAR
> greater than 0 will cause the
          function to receive the first message that is not equal to
          <VAR
CLASS="parameter"
>desiredmsgtype</VAR
>.</TD
></TR
><TR
><TD
><TT
CLASS="constant"
><B
>MSG_NOERROR</B
></TT
></TD
><TD
>&#13;          If the message is longer than <VAR
CLASS="parameter"
>maxsize</VAR
>,
          setting this flag will truncate the message to
          <VAR
CLASS="parameter"
>maxsize</VAR
> and will not signal an error.
         </TD
></TR
></TBODY
></TABLE
></DIV
>
    </P
><P
>&#13;     Upon successful completion the message queue data structure is updated as
     follows: <VAR
CLASS="literal"
>msg_lrpid</VAR
> is set to the process-ID of the
     calling process, <VAR
CLASS="literal"
>msg_qnum</VAR
> is decremented by 1 and
     <VAR
CLASS="literal"
>msg_rtime</VAR
> is set to the current time.
    </P
><P
>&#13;     <B
CLASS="function"
>msg_receive()</B
> returns <TT
CLASS="constant"
><B
>TRUE</B
></TT
> on success or <TT
CLASS="constant"
><B
>FALSE</B
></TT
> on
     failure.  If the function fails, the optional
     <VAR
CLASS="parameter"
>errorcode</VAR
> will be set to the value of the system
     errno variable.
    </P
><P
>&#13;     See also <A
HREF="function.msg-remove-queue.html"
><B
CLASS="function"
>msg_remove_queue()</B
></A
>,
     <A
HREF="function.msg-send.html"
><B
CLASS="function"
>msg_send()</B
></A
>,
     <A
HREF="function.msg-stat-queue.html"
><B
CLASS="function"
>msg_stat_queue()</B
></A
> and
     <A
HREF="function.msg-set-queue.html"
><B
CLASS="function"
>msg_set_queue()</B
></A
>.
    </P
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WIDTH="33%"
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><A
HREF="function.msg-get-queue.html"
ACCESSKEY="P"
>Пред.</A
></TD
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></TD
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></TD
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><TR
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>msg_get_queue</TD
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