help me

hallo allemaal

ik heb een script op mijn computer staan maar daar moet wat aan verandert worden maar ik weet niet hoe.

dit is het script:

[COLOR= #0000BB]<?php
$a[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]2[/COLOR][COLOR= #007700];[/COLOR]
[COLOR= #0000BB]$b[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]4[/COLOR][COLOR= #007700];[/COLOR]
[URL="http://www.php.net/if"]if[/URL] [COLOR= #007700]([/COLOR][COLOR= #0000BB]$a[/COLOR] [COLOR= #007700]==[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700])
{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is gelijk aan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000]![/COLOR][COLOR= #007700];
}[/COLOR]
[URL="http://www.php.net/elseif"]elseif[/URL] [COLOR= #007700]([/COLOR][COLOR= #0000BB]$a[/COLOR] [COLOR= #007700]>[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700])
{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is groter dan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700];
}[/COLOR]
[URL="http://www.php.net/else"]else[/URL]
[COLOR= #007700]{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is kleiner dan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700];
}[/COLOR]
?>

maar ik wil dan op de pagina van de site dan zelf $a = 2; en $b = 4; kunnen invullen.

weet iemand hoe dat moet???

gr, rohimma

[COLOR= #0000BB]<?php[/COLOR]
[URL="http://www.php.net/if"]if[/URL][COLOR= #007700]([/COLOR][URL="http://www.php.net/isset"]isset[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$_POST[/COLOR][COLOR= #007700][[/COLOR][COLOR= #DD0000]ok[/COLOR][COLOR= #007700]]))
{[/COLOR]
[COLOR= #0000BB]$a[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]$_POST[/COLOR][COLOR= #007700][[/COLOR][COLOR= #DD0000]a[/COLOR][COLOR= #007700]];[/COLOR]
[COLOR= #0000BB]$b[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]$_POST[/COLOR][COLOR= #007700][[/COLOR][COLOR= #DD0000]b[/COLOR][COLOR= #007700]];[/COLOR]
[URL="http://www.php.net/if"]if[/URL] [COLOR= #007700]([/COLOR][COLOR= #0000BB]$a[/COLOR] [COLOR= #007700]==[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700])
{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is gelijk aan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000]![/COLOR][COLOR= #007700];
}[/COLOR]
[URL="http://www.php.net/elseif"]elseif[/URL] [COLOR= #007700]([/COLOR][COLOR= #0000BB]$a[/COLOR] [COLOR= #007700]>[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700])
{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is groter dan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700];
}[/COLOR]
[URL="http://www.php.net/else"]else[/URL]
[COLOR= #007700]{[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] [COLOR= #0000BB]$a[/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #DD0000] is kleiner dan [/COLOR] [COLOR= #007700].[/COLOR] [COLOR= #0000BB]$b[/COLOR][COLOR= #007700];
}
}[/COLOR]
[URL="http://www.php.net/else"]else[/URL]
[COLOR= #007700]{[/COLOR]
[URL="http://www.php.net/echo"]echo[/URL] [COLOR= #DD0000]<form method="post"><input type="text" name="a" value="getal 2"><input type="text" name="b" value="getal 2"><input type="submit" value="vergelijk" name="ok"></form>[/COLOR][COLOR= #007700];
}[/COLOR]
?>

Volgens mij werkt dat wel, zitten alleen geen controles in mbt de ingevulde data, dus dat kan je er eventueel zelf aan toevoegen