<HTML ><HEAD ><TITLE >old_function</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Functions" HREF="functions.html"><LINK REL="PREVIOUS" TITLE="Returning values" HREF="functions.returning-values.html"><LINK REL="NEXT" TITLE="Variable functions" HREF="functions.variable-functions.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="sect1" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="functions.returning-values.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" >Chapter 13. Functions</TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="functions.variable-functions.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="sect1" ><H1 CLASS="sect1" ><A NAME="functions.old-syntax" ></A ><TT CLASS="literal" >old_function</TT ></H1 ><P > The <TT CLASS="literal" >old_function</TT > statement allows you to declare a function using a syntax identical to PHP/FI2 (except you must replace 'function' with 'old_function'. </P ><P > This is a deprecated feature, and should only be used by the PHP/FI2->PHP 3 convertor. </P ><DIV CLASS="warning" ><P ></P ><TABLE CLASS="warning" BORDER="1" WIDTH="100%" ><TR ><TD ALIGN="CENTER" ><B >Warning</B ></TD ></TR ><TR ><TD ALIGN="LEFT" ><P > Functions declared as <TT CLASS="literal" >old_function</TT > cannot be called from PHP's internal code. Among other things, this means you can't use them in functions such as <A HREF="function.usort.html" ><B CLASS="function" >usort()</B ></A >, <A HREF="function.array-walk.html" ><B CLASS="function" >array_walk()</B ></A >, and <A HREF="function.register-shutdown-function.html" ><B CLASS="function" >register_shutdown_function()</B ></A >. You can get around this limitation by writing a wrapper function (in normal PHP 3 form) to call the <TT CLASS="literal" >old_function</TT >. </P ></TD ></TR ></TABLE ></DIV ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="functions.returning-values.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="functions.variable-functions.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Returning values</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="functions.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >Variable functions</TD ></TR ></TABLE ></DIV ></BODY ></HTML >