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<HTML
><HEAD
><TITLE
>Short-circuited boolean evaluation</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.57"><LINK
REL="HOME"
TITLE="PHP Manual"
HREF="manual.html"><LINK
REL="UP"
TITLE="Migrating from PHP/FI 2.0 to PHP 3.0"
HREF="migration.html"><LINK
REL="PREVIOUS"
TITLE="Error messages have changed"
HREF="migration-errors.html"><LINK
REL="NEXT"
TITLE="Function true/false return values"
HREF="migration-truefalse.html"><META
NAME="HTTP_EQUIV"
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
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="migration-errors.html"
>Prev</A
></TD
><TD
WIDTH="80%"
ALIGN="center"
VALIGN="bottom"
>Appendix A. Migrating from PHP/FI 2.0 to PHP 3.0</TD
><TD
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ALIGN="right"
VALIGN="bottom"
><A
HREF="migration-truefalse.html"
>Next</A
></TD
></TR
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><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="sect1"
><H1
CLASS="sect1"
><A
NAME="migration-booleval"
>Short-circuited boolean evaluation</A
></H1
><P
>&#13;   In PHP 3.0 boolean evaluation is short-circuited.  This means that
   in an expression like <TT
CLASS="literal"
>(1 || test_me())</TT
>, the
   function <B
CLASS="function"
>test_me()</B
> would not be executed since
   nothing can change the result of the expression after the
   <TT
CLASS="literal"
>1</TT
>.</P
><P
>&#13;   This is a minor compatibility issue, but may cause unexpected
   side-effects.</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="migration-errors.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="migration-truefalse.html"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
>Error messages have changed</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="migration.html"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Function true/false return values</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>