php-doc-en/reference/sem/functions/shm-attach.xml

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.shm-attach">
 <refnamediv>
  <refname>shm_attach</refname>
  <refpurpose>Creates or open a shared memory segment</refpurpose>
 </refnamediv>
 
 <refsect1 role="description">
  &reftitle.description;
  <methodsynopsis>
   <type>resource</type><methodname>shm_attach</methodname>
   <methodparam><type>int</type><parameter>key</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>memsize</parameter></methodparam>
   <methodparam choice="opt"><type>int</type><parameter>perm</parameter></methodparam>
  </methodsynopsis>
  <para>
   <function>shm_attach</function> returns an id that can be used to access
   the System V shared memory with the given <parameter>key</parameter>, the
   first call creates the shared memory segment with 
   <parameter>memsize</parameter> and the optional perm-bits 
   <parameter>perm</parameter>.
  </para>
  <para>
   A second call to <function>shm_attach</function> for the same
   <parameter>key</parameter> will return a different shared memory
   identifier, but both identifiers access the same underlying
   shared memory. <parameter>memsize</parameter> and
   <parameter>perm</parameter> will be ignored.
  </para>
 </refsect1>

 <refsect1 role="parameters">
  &reftitle.parameters;
  <para>
   <variablelist>
    <varlistentry>
     <term><parameter>key</parameter></term>
     <listitem>
      <para>
       A numeric shared memory segment ID
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>memsize</parameter></term>
     <listitem>
      <para>
       The memory size. If not provided, default to the
       <literal>sysvshm.init_mem</literal> in the &php.ini;, otherwise 10000
       bytes.
      </para>
     </listitem>
    </varlistentry>
    <varlistentry>
     <term><parameter>perm</parameter></term>
     <listitem>
      <para>
       The optional permission bits. Default to 0666.
      </para>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns a shared memory segment identifier.
  </para>
 </refsect1>

 <refsect1 role="seealso">
  &reftitle.seealso;
  <para>
   <simplelist>
    <member><function>shm_detach</function></member>
    <member><function>ftok</function></member>
   </simplelist>
  </para>
 </refsect1>  

</refentry>

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