php-doc-en/reference/pgsql/functions/pg-pconnect.xml

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<refentry xml:id="function.pg-pconnect" xmlns="http://docbook.org/ns/docbook">
 <refnamediv>
  <refname>pg_pconnect</refname>
  <refpurpose>Open a persistent PostgreSQL connection</refpurpose>
 </refnamediv>

 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>pg_pconnect</methodname>
   <methodparam><type>string</type><parameter>connection_string</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>connect_type</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>pg_pconnect</function> opens a connection to a
   PostgreSQL database. It returns a connection resource that is
   needed by other PostgreSQL functions.
  </para>
  <para>
   If a second call is made to <function>pg_pconnect</function> with
   the same <parameter>connection_string</parameter> as an existing connection, the
   existing connection will be returned unless you pass
   <constant>PGSQL_CONNECT_FORCE_NEW</constant> as
   <parameter>connect_type</parameter>.
  </para>
  <para>
   To enable persistent connection, the <link
    linkend="ini.pgsql.allow-persistent">pgsql.allow_persistent</link>
   &php.ini; directive must be set to &quot;On&quot; (which is the default).
   The maximum number of persistent connection can be defined with the <link
    linkend="ini.pgsql.max-persistent">pgsql.max_persistent</link>
   &php.ini; directive (defaults to -1 for no limit). The total number
   of connections can be set with the <link
    linkend="ini.pgsql.max-links">pgsql.max_links</link> 
   &php.ini; directive.
  </para>
  <para>
   <function>pg_close</function> will not close persistent links
   generated by <function>pg_pconnect</function>.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>connection_string</parameter></term>
     <listitem>
      <para>
       The <parameter>connection_string</parameter> can be empty to use all default parameters, or it 
       can contain one or more parameter settings separated by whitespace. 
       Each parameter setting is in the form <literal>keyword = value</literal>. Spaces around 
       the equal sign are optional. To write an empty value or a value 
       containing spaces, surround it with single quotes, e.g., <literal>keyword = 
       'a value'</literal>. Single quotes and backslashes within the value must be 
       escaped with a backslash, i.e., \' and \\.  
      </para>
      <para>
       The currently recognized parameter keywords are:
       <parameter>host</parameter>, <parameter>hostaddr</parameter>, <parameter>port</parameter>,
       <parameter>dbname</parameter>, <parameter>user</parameter>,
       <parameter>password</parameter>, <parameter>connect_timeout</parameter>,
       <parameter>options</parameter>, <parameter>tty</parameter> (ignored), <parameter>sslmode</parameter>,
       <parameter>requiressl</parameter> (deprecated in favor of <parameter>sslmode</parameter>), and
       <parameter>service</parameter>.  Which of these arguments exist depends
       on your PostgreSQL version.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>connect_type</parameter></term>
     <listitem>
      <para>
       If <constant>PGSQL_CONNECT_FORCE_NEW</constant> is passed, then a new connection
       is created, even if the <parameter>connection_string</parameter> is identical to
       an existing connection.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   PostgreSQL connection resource on success, &false; on failure.
  </para>
 </refsect1>
 
 <refsect1 role="examples">
  &reftitle.examples;
  <para>
   <example>
    <title>Using <function>pg_pconnect</function></title>
    <programlisting role="php">
<![CDATA[
<?php
$dbconn = pg_pconnect("dbname=mary");
//connect to a database named "mary"

$dbconn2 = pg_pconnect("host=localhost port=5432 dbname=mary");
// connect to a database named "mary" on "localhost" at port "5432"

$dbconn3 = pg_pconnect("host=sheep port=5432 dbname=mary user=lamb password=foo");
//connect to a database named "mary" on the host "sheep" with a username and password

$conn_string = "host=sheep port=5432 dbname=test user=lamb password=bar";
$dbconn4 = pg_pconnect($conn_string);
//connect to a database named "test" on the host "sheep" with a username and password
?>
]]>
    </programlisting>
   </example>
  </para>
 </refsect1>
 
 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>pg_connect</function></member>
    <member>
     <link linkend="features.persistent-connections">
     Persistent Database Connections</link>
    </member>
   </simplelist>
  </para>
 </refsect1>
</refentry>

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