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> While handling of global variables had the focus on to be easy in
PHP 3 and early versions of PHP 4, the focus has changed to be more
secure. While in PHP 3 the following example worked fine, in PHP 4 it
has to be unset(<TT
CLASS="literal"
>unset($GLOBALS["id"])</TT
>);. This is
only one issue of global
variable handling. You should always have used <CODE
CLASS="varname"
>$GLOBALS</CODE
>, with
newer versions of PHP 4 you are forced to do so in most cases.
Read more on this subject in the <A
HREF="language.references.spot.html#references.global"
> <TT
CLASS="literal"
>global</TT
> references section</A
>.
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>Exemplo D-1. Migration of global variables</B
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><code><font color="#000000">
<font color="#0000BB"><?php<br />$id </font><font color="#007700">= </font><font color="#0000BB">1</font><font color="#007700">;<br />function </font><font color="#0000BB">test</font><font color="#007700">()<br />{<br /> global </font><font color="#0000BB">$id</font><font color="#007700">;<br /> unset(</font><font color="#0000BB">$id</font><font color="#007700">);<br />}<br /></font><font color="#0000BB">test</font><font color="#007700">();<br />echo(</font><font color="#0000BB">$id</font><font color="#007700">); </font><font color="#FF8000">// This will print out 1 in PHP 4<br /></font><font color="#0000BB">?></font>
</font>
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