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>session_id</H1
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><P
> (PHP 4 )</P
>session_id -- Get and/or set the current session id</DIV
><DIV
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></A
><H2
>Description</H2
>string <B
CLASS="methodname"
>session_id</B
> ( [string id])<BR
></BR
><P
> <B
CLASS="function"
>session_id()</B
> returns the session id for the
current session.
</P
><P
> If <TT
CLASS="parameter"
><I
>id</I
></TT
> is specified, it will replace the current
session id. <B
CLASS="function"
>session_id()</B
> needs to be called before
<A
HREF="function.session-start.html"
><B
CLASS="function"
>session_start()</B
></A
> for that purpose. Depending on the
session handler, not all characters are allowed within the session id.
For example, the file session handler only allows characters in the range
<TT
CLASS="literal"
>a-z, A-Z and 0-9</TT
>!
</P
><P
> The constant <SPAN
CLASS="systemitem"
>SID</SPAN
> can also be used to
retrieve the current name and session id as a string suitable for
adding to URLs. Note that <SPAN
CLASS="systemitem"
>SID</SPAN
> is only defined if
the client didn't send the right cookie. See also <A
HREF="ref.session.html"
>Session handling</A
>.
</P
><P
> See also <A
HREF="function.session-start.html"
><B
CLASS="function"
>session_start()</B
></A
>,
<A
HREF="function.session-set-save-handler.html"
><B
CLASS="function"
>session_set_save_handler()</B
></A
>, and
<A
HREF="ref.session.html#ini.session.save-handler"
>session.save_handler</A
>.
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