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>Other incompatibilities</TITLE
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><H1
CLASS="sect1"
><A
NAME="migration-other"
>Other incompatibilities</A
></H1
><P
></P
><UL
><LI
><P
> The PHP 3.0 Apache module no longer supports Apache versions
prior to 1.2. Apache 1.2 or later is required.</P
></LI
><LI
><P
> <A
HREF="function.echo.html"
><B
CLASS="function"
>echo()</B
></A
> no longer
supports a format string. Use the
<A
HREF="function.printf.html"
><B
CLASS="function"
>printf()</B
></A
> function instead.</P
></LI
><LI
><P
> In PHP/FI 2.0, an implementation side-effect caused
<TT
CLASS="literal"
>$foo[0]</TT
> to have the same effect as
<TT
CLASS="literal"
>$foo</TT
>. This is not true for PHP 3.0.</P
></LI
><LI
><P
> Reading arrays with <TT
CLASS="literal"
>$array[]</TT
> is no longer
supported</P
><P
> That is, you cannot traverse an array by having a loop that does
<TT
CLASS="literal"
>$data = $array[]</TT
>. Use
<A
HREF="function.current.html"
><B
CLASS="function"
>current()</B
></A
> and <A
HREF="function.next.html"
><B
CLASS="function"
>next()</B
></A
>
instead.</P
><P
> Also, <TT
CLASS="literal"
>$array1[] = $array2</TT
> does not append the
values of <TT
CLASS="literal"
>$array2</TT
> to <TT
CLASS="literal"
>$array1</TT
>,
but appends <TT
CLASS="literal"
>$array2</TT
> as the last entry of
<TT
CLASS="literal"
>$array1</TT
>. See also multidimensional array
support.</P
></LI
><LI
><P
> <TT
CLASS="literal"
>"+"</TT
> is no longer overloaded as a
concatenation operator for strings, instead it converts it's
arguments to numbers and performs numeric addition. Use
<TT
CLASS="literal"
>"."</TT
> instead.</P
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><P
><B
>Example A-11. Migration from 2.0: concatenation for strings</B
></P
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><TR
><TD
><PRE
CLASS="programlisting"
> 1
2 echo "1" + "1";
3 </PRE
></TD
></TR
></TABLE
><P
>
In PHP 2.0 this would echo 11, in PHP 3.0 it would echo 2. Instead
use:
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
> 1
2 echo "1"."1";
3 </PRE
></TD
></TR
></TABLE
>
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
> 1
2 $a = 1;
3 $b = 1;
4 echo $a + $b;
5 </PRE
></TD
></TR
></TABLE
></P
><P
>
This would echo 2 in both PHP 2.0 and 3.0.
<TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
WIDTH="100%"
><TR
><TD
><PRE
CLASS="programlisting"
> 1
2 $a = 1;
3 $b = 1;
4 echo $a.$b;
5 </PRE
></TD
></TR
></TABLE
>
This will echo 11 in PHP 3.0.</P
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