php-doc-en/reference/sockets/functions/socket-getpeername.xml

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<refentry id="function.socket-getpeername">
 <refnamediv>
  <refname>socket_getpeername</refname>
  <refpurpose>Queries the remote side of the given socket which may either result in host/port or in a Unix filesystem path, dependent on its type</refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
  <methodsynopsis>
   <type>bool</type><methodname>socket_getpeername</methodname>
   <methodparam><type>resource</type><parameter>socket</parameter></methodparam>
   <methodparam><type>string</type><parameter role="reference">addr</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter role="reference">port</parameter></methodparam>
  </methodsynopsis>
  <para>
   If the given socket is of type <constant>AF_INET</constant>
   or <constant>AF_INET6</constant>, <function>socket_getpeername</function>
   will return the peers (remote) <emphasis>IP address</emphasis> in appropriate notation (e.g.
   <literal>127.0.0.1</literal> or <literal>fe80::1</literal>) in the
   <parameter>address</parameter> parameter and, if the optional
   <parameter>port</parameter> parameter is present, also the associated port.
  </para>
  <para>
   If the given socket is of type <constant>AF_UNIX</constant>,
   <function>socket_getpeername</function> will return the Unix filesystem
   path (e.g. <literal>/var/run/daemon.sock</literal>) in the
   <parameter>address</parameter> parameter.
  </para>
  <note>
   <simpara>
    <function>socket_getpeername</function> should not be used with
    <constant>AF_UNIX</constant> sockets created with <function>socket_accept</function>.
    Only sockets created with <function>socket_connect</function> or a primary
    server socket following a call to <function>socket_bind</function> will return
    meaningful values.
   </simpara>
  </note>
  <para>
   &return.success; <function>socket_getpeername</function> may also return
   &false; if the socket type is not any of <constant>AF_INET</constant>,
   <constant>AF_INET6</constant>, or <constant>AF_UNIX</constant>, in which
   case the last socket error code is <emphasis>not</emphasis> updated.
  </para>
  <para>
   See also
   <function>socket_getsockname</function>,
   <function>socket_last_error</function> and
   <function>socket_strerror</function>.
  </para>
 </refsect1>
</refentry>

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