Copying php script from book and get error

Hello,

I m recently started to study php

I m copying the example script from the ebook but I get the following error

Parse error: syntax error, unexpected 'have' (T_STRING), expecting ',' or ';' in C:\wamp\www\1.php on line 6

script is

?php

$widgets = 23;
if ( $widgets == 23 ) {
echo "We have exactly 23 widgets in stock!";

}
?>


also with other similar scripts I get parse errors too. Where is the problem?

Thanks