Hoe moet je radom letters genereren?

Hallo,

Ik wil graag weten hoe je random letters in php moet genereren.

mvg,
Tom Heek

[COLOR= #0000BB]<?php[/COLOR]
[COLOR= #007700]function[/COLOR] Random[COLOR= #007700]([/COLOR][COLOR= #0000BB]$length[/COLOR][COLOR= #007700]=[/COLOR][COLOR= #0000BB]5[/COLOR][COLOR= #007700]){[/COLOR]
    [COLOR= #0000BB]$a1[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #DD0000][/COLOR][COLOR= #007700];[/COLOR]
    [COLOR= #0000BB]$a2[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #DD0000]"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz"[/COLOR][COLOR= #007700];[/COLOR]
    [URL="http://www.php.net/for"]for[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$i[/COLOR][COLOR= #007700]=[/COLOR][COLOR= #0000BB]0[/COLOR][COLOR= #007700];[/COLOR][COLOR= #0000BB]$i[/COLOR][COLOR= #007700]<[/COLOR][COLOR= #0000BB]$length[/COLOR][COLOR= #007700];[/COLOR][COLOR= #0000BB]$i[/COLOR][COLOR= #007700]++){[/COLOR]
        [COLOR= #0000BB]$a1[/COLOR] [COLOR= #007700].=[/COLOR] [COLOR= #0000BB]$a2[/COLOR][COLOR= #007700]{[/COLOR][URL="http://www.php.net/rand"]rand[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]0[/COLOR][COLOR= #007700],[/COLOR][COLOR= #0000BB]35[/COLOR][COLOR= #007700])};
          }[/COLOR]
    [URL="http://www.php.net/return"]return[/URL] [COLOR= #0000BB]$a1[/COLOR][COLOR= #007700];
}[/COLOR]

[URL="http://www.php.net/echo"]echo[/URL] Random[COLOR= #007700]([/COLOR][COLOR= #0000BB]8[/COLOR][COLOR= #007700]);[/COLOR]

?>

[COLOR= #0000BB]<?php[/COLOR]
    [COLOR= #007700]function[/COLOR] random[COLOR= #007700]([/COLOR][COLOR= #0000BB]$length[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]5[/COLOR][COLOR= #007700],[/COLOR] [COLOR= #0000BB]$caps[/COLOR] [COLOR= #007700]=[/COLOR] false[COLOR= #007700])
    {[/COLOR]
        
        [COLOR= #0000BB]$ret[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #DD0000][/COLOR][COLOR= #007700];[/COLOR]
        [COLOR= #0000BB]$range[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/range"]range[/URL][COLOR= #007700]([/COLOR][COLOR= #DD0000]a[/COLOR][COLOR= #007700],[/COLOR] [COLOR= #DD0000]z[/COLOR][COLOR= #007700]);[/COLOR]

        [URL="http://www.php.net/if"]if[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$caps[/COLOR][COLOR= #007700])[/COLOR]
            [COLOR= #0000BB]$range[/COLOR] [COLOR= #007700]=[/COLOR] [URL="http://www.php.net/array_merge"]array_merge[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$range[/COLOR][COLOR= #007700],[/COLOR] [URL="http://www.php.net/range"]range[/URL][COLOR= #007700]([/COLOR][COLOR= #DD0000]A[/COLOR][COLOR= #007700],[/COLOR] [COLOR= #DD0000]Z[/COLOR][COLOR= #007700]));[/COLOR]

        [URL="http://www.php.net/for"]for[/URL][COLOR= #007700]([/COLOR][COLOR= #0000BB]$i[/COLOR] [COLOR= #007700]=[/COLOR] [COLOR= #0000BB]0[/COLOR][COLOR= #007700];[/COLOR] [COLOR= #0000BB]$i[/COLOR] [COLOR= #007700]<[/COLOR] [COLOR= #0000BB]$length[/COLOR][COLOR= #007700];[/COLOR] [COLOR= #0000BB]$i[/COLOR][COLOR= #007700]++)[/COLOR]
            [COLOR= #0000BB]$ret[/COLOR] [COLOR= #007700].=[/COLOR] [COLOR= #0000BB]$range[/COLOR][COLOR= #007700][[/COLOR]array_rang[COLOR= #007700]([/COLOR][COLOR= #0000BB]$range[/COLOR][COLOR= #007700])];[/COLOR]

        [URL="http://www.php.net/return"]return[/URL] [COLOR= #0000BB]$ret[/COLOR][COLOR= #007700];

    }[/COLOR]
    
    [COLOR= #FF8000]// 5 letters, GEEN hoofdletters[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] random[COLOR= #007700]();[/COLOR]

    [COLOR= #FF8000]// 23 letters, GEEN hoofdletters[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] random[COLOR= #007700]([/COLOR][COLOR= #0000BB]23[/COLOR][COLOR= #007700]);[/COLOR]

    [COLOR= #FF8000]// 5 letters, WEL hoofdletters[/COLOR]
    [URL="http://www.php.net/echo"]echo[/URL] random[COLOR= #007700]([/COLOR][COLOR= #0000BB]5[/COLOR][COLOR= #007700],[/COLOR] true[COLOR= #007700]);[/COLOR]

Oke, bedankt.