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>pg_get_pid</H1
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>    (PHP 4 &#62;= 4.3.0, PHP 5)</P
>pg_get_pid&nbsp;--&nbsp;Ping 数据库连接</DIV
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>说明</H2
>int <B
CLASS="methodname"
>pg_get_pid</B
> ( resource connection )<BR
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>&#13;     <B
CLASS="function"
>pg_get_pid()</B
> 取得后端（数据库服务器进程）的
     PID。PID 用来检查其它进程是否发送了
     <TT
CLASS="literal"
>NOTIFY</TT
> 消息。
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>例 1. PostgreSQL 后端 PID</B
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><code><font color="#000000">
<font color="#0000BB">&lt;?php <br />$conn </font><font color="#007700">= </font><font color="#0000BB">pg_pconnect</font><font color="#007700">(</font><font color="#DD0000">"dbname=publisher"</font><font color="#007700">);<br />if (!</font><font color="#0000BB">$conn</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"An error occured.\n"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;exit;<br />}<br /><br /></font><font color="#FF8000">// Backend process PID. Use PID with pg_get_notify()<br /></font><font color="#0000BB">$pid </font><font color="#007700">= </font><font color="#0000BB">pg_get_pid</font><font color="#007700">(</font><font color="#0000BB">$conn</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
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>&#13;     参见 <A
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>pg_get_notify()</B
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