Creating all possible combinations from array.

[Chris92]

Hi. I need some help working something out.

 

I have an array that has all the numbers from, 0 to 9. What I want to do is loop through the array to make all the combinations possible up to a string thats 255 chars long.

 

$array = array( '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' );

 

Should be looped through to create strings like this:

0
1
2
3
4
5
6
7
8
9
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23 etc..

 

Just as if it's counting.

[freelance84]

Do you want every possible combination of the one string which is 255 characters long?

[Pikachu2000]

This would do it, but I really don't think you have any idea how big the resultant set of numbers actually is.

<?php
for( $i = 0; $i < 1E256; $i++) {
echo "$i<br>";
}
?>

[/code]

[Chris92]

This would do it, but I really don't think you have any idea how big the resultant set of numbers actually is.

<?php
for( $i = 0; $i < 1E256; $i++) {
echo "$i<br>";
}
?>

[/code]

No.. you're adding numbers.. maybe i should have made an example with letters.

 

Say I were to do:

$array = array( 'a', 'b', 'c', 'd', 'e', 'f' );

 

I want to make it loop through the array and get a result like this:

a
b
c
d
e
f
aa
ab
ac
ad
ae
af
ba
bb
bc
bd
be
bf
ca
cb
cc
cd
ce
cf
da
db
dc
dd
de
df
ea
eb
ec
ed
ee
ef
fa
fb
fc
fd
fe
ff
aaa
aab
aac
aad
aae
aaf
aba
abb
abc... etc

 

And yes I realise how big this would be.. I'm not planning to do it all in one go.

[Pikachu2000]

So rather than integers, you want it to be strings of digits then, right?

[Chris92]

Yep, and it has to keep making combinations until the string is 256 chars long. Which will be a good few billion combinations, if not more.

[Pikachu2000]

A few billion? It should be 1.0x10²⁵⁶, or this many

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

 

But anyhow, Let's see what we can come up with. This is strictly proof-of-concept code here. It doesn't put them in the order you wanted, but it does spit out some numbers. It would need to be modified to use anything other than numbers, or take an array as input. I haven't done anything other than see if it would run from 0-9, so I don't know what other issues may surface.

 

<?php
$max = 10; // to get full range of values, change to $max = 10E256;
for( $n = 0; $n < $max; $n++ ) {
   $str = $n;
   for( $i = 1; $i < 256; $i ++ ) {
      echo str_pad($str, $i, '0', STR_PAD_LEFT) . '<br>';
   }
}
?>

[Chris92]

A few billion? It should be 1.0x10²⁵⁶, or this many

1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000

 

But anyhow, Let's see what we can come up with. This is strictly proof-of-concept code here. It doesn't put them in the order you wanted, but it does spit out some numbers. It would need to be modified to use anything other than numbers, or take an array as input. I haven't done anything other than see if it would run from 0-9, so I don't know what other issues may surface.

 

<?php
$max = 10; // to get full range of values, change to $max = 10E256;
for( $n = 0; $n < $max; $n++ ) {
   $str = $n;
   for( $i = 1; $i < 256; $i ++ ) {
      echo str_pad($str, $i, '0', STR_PAD_LEFT) . '<br>';
   }
}
?>

 

Okay even beter.. the more possibilities the better.

 

Again you're just adding a few numbers together in your loop. That's not the point. It's supposed to loop through the array. Once it's reached the length of the array, loop through it again + with another loop. Then once it's reached the length of the array^2. Loop through it again + another loop + another loop, until it reaches the length of the array^3. etc etc etc. Right up to the length of the array^255.

[Pikachu2000]

I didn't say it was a finished, plug-and-play solution, did I?

[Chris92]

I didn't say it was a finished, plug-and-play solution, did I?

 

Oh sorry.

 

I've come up with this:

<?php

header('content-type: text/plain');

$array = array('0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');
$level = 0;
foreach( $array as $key => $value )
{

if( $key+1 == count($array) )
{
	$level++;
}

if( $level == 0 )
{
	echo $value ."\n";
}
else
{
	while( $level != count($array) )
	{
		foreach( $array as $key => $value )
		{
			echo $array[$level] . $value ."\n";
		}
		$level++;
	}
}
}

?>

 

I can't figure out how to get it to make it's own loops depending on the level.

 

Any ideas?

 

Thanks for the help BTW.