php brute force code.. hlp plz .....

hello friends,

from somewhere i got a code that can generate all posible combination via recursive function in php all is working fine, but for my project i need a more more additional help in my script. i dont know how to get solved i tried for two hours but no sorted so please helpz... its urgent

this is the php script

////////////////////////////////////  Started PHP Code //////////////////////


set_time_limit(0);

$charset = "abc";

$charset_length = strlen($charset);

define('MAX_LENGTH', 3);

function recurse($width, $position, $base_string){

global $charset, $charset_length;

for ($i = 0; $i < $charset_length; ++$i){

echo $base_string . $charset[$i] . "\n";


if ($position <  $width - 1){

recurse($width, $position + 1, $base_string . $charset[$i]);

}

}

}

recurse (MAX_LENGTH, 0, '');



////////////////////////////////////  Ended PHP Code //////////////////////

now i the output of this is

a 
aa 
aaa 
aab 
aac 
ab 
aba 
abb 
abc 
ac 
aca 
acb 
acc 
b 
ba 
baa 
bab 
bac 
bb 
bba 
bbb 
bbc 
bc 
bca 
bcb 
bcc 
c 
ca 
caa 
cab 
cac 
cb 
cba 
cbb 
cbc 
cc 
cca 
ccb 
ccc 

now each time when i runs this script the out put is same (starting from a and ending to ccc) but i want some different result may time.

i want that the script must start generating the combination from sevent word

i.e., 

aba
abb 
abc 
ac 
aca 
acb 

and so on ... to last combination

so please edit my script so that i can get my project completed

or i u have any other code of such type then please link to it

i want only in php

thanks!