<HTML ><HEAD ><TITLE >function_exists</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.44"><LINK REL="HOME" TITLE="PHP Manual" HREF="manual.html"><LINK REL="UP" TITLE="Miscellaneous functions" HREF="ref.misc.html"><LINK REL="PREVIOUS" TITLE="func_num_args" HREF="function.func-num-args.html"><LINK REL="NEXT" TITLE="get_browser" HREF="function.get-browser.html"></HEAD ><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><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="function.func-num-args.html" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.get-browser.html" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.function-exists" >function_exists</A ></H1 ><DIV CLASS="refnamediv" ><A NAME="AEN17415" ></A >function_exists -- Return true if the given function has been defined. </DIV ><DIV CLASS="refsect1" ><A NAME="AEN17418" ></A ><H2 >Description</H2 ><DIV CLASS="funcsynopsis" ><P ></P ><CODE CLASS="FUNCDEF" >int function_exists</CODE >(string function_name);<P ></P ></DIV ><P > Checks the list of defined functions for <TT CLASS="parameter" ><I >function_name</I ></TT >. Returns true if the given function name was found, false otherwise. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.func-num-args.html" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="manual.html" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.get-browser.html" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >func_num_args</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.misc.html" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >get_browser</TD ></TR ></TABLE ></DIV ></BODY ></HTML >