php-doc-en/reference/session/functions/session-start.xml

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  <refentry id="function.session-start">
   <refnamediv>
    <refname>session_start</refname>
    <refpurpose>Initialize session data</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>session_start</methodname>
      <void/>
     </methodsynopsis>
    <simpara>
     <function>session_start</function> creates a session or resumes
     the current one based on the current session id that's being 
     passed via a request, such as GET, POST, or a cookie.
    </simpara>
    <simpara>
     If you want to use a named session, you must call
     <function>session_name</function> before calling
     <function>session_start</function>.
    </simpara>
    <simpara>
     This function always returns &true;.
    </simpara>
    <note>
     <para>
      If you are using cookie-based sessions, you must call
      <function>session_start</function> before anything is output to the
      browser.
     </para>
    </note>
    <simpara>
     <function>session_start</function> will register internal output
     handler for URL rewriting when <literal>trans-sid</literal> is
     enabled. If a user uses <literal>ob_gzhandler</literal> or like
     with <function>ob_start</function>, the order of output handler
     is important for proper output. For example, user must register
     <literal>ob_gzhandler</literal> before session start.
    </simpara>
    <note>
     <simpara>
      Use of <link linkend="ini.zlib.output-compression">zlib.output_compression</link>
      is recommended rather than <function>ob_gzhandler</function>
     </simpara>
    </note>
   </refsect1>
  </refentry>

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