<HTML ><HEAD ><TITLE >class_exists</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="Manual de PHP" HREF="index.html"><LINK REL="UP" TITLE="Funciones de Clases/Objectos" HREF="ref.classobj.html"><LINK REL="PREVIOUS" TITLE="call_user_method" HREF="function.call-user-method.html"><LINK REL="NEXT" TITLE="get_class_methods" HREF="function.get-class-methods.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" 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" >Manual de PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.call-user-method.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.get-class-methods.html" ACCESSKEY="N" >Siguiente</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.class-exists" ></A >class_exists</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN8406" ></A ><P > (PHP 4 )</P >class_exists -- Checks if the class has been defined</DIV ><DIV CLASS="refsect1" ><A NAME="AEN8409" ></A ><H2 >Description</H2 >bool <B CLASS="methodname" >class_exists</B > ( string class_name)<BR ></BR ><P > This function returns <TT CLASS="constant" ><B >TRUE</B ></TT > if the class given by <TT CLASS="parameter" ><I >class_name</I ></TT > has been defined, <TT CLASS="constant" ><B >FALSE</B ></TT > otherwise. </P ><P > See also <A HREF="function.get-declared-classes.html" ><B CLASS="function" >get_declared_classes()</B ></A >. </P ></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="function.call-user-method.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Inicio</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.get-class-methods.html" ACCESSKEY="N" >Siguiente</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >call_user_method</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.classobj.html" ACCESSKEY="U" >Subir</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >get_class_methods</TD ></TR ></TABLE ></DIV ></BODY ></HTML >