help with cycle of FORs

[Wes]

hello, i have an array like this

where all array sizes are not fixed

Array
(
[0] => Array
(
[0] => b
[1] => a
)

[1] => Array
    (
        [0] => d
        [1] => c
    )

[2] => Array
    (
        [0] => g
        [1] => f
        [2] => e
    )

)

i have to echo combinations of all values:

bdg
bdf
bde
bcg
bcf
bce
adg
adf
ade
acg
acf
ace

so what is the way to get this with php code?
thank you

[laserlight]

This sounds like a homework question. What have you tried?

[Wes]

laserlight;10901628 wrote:

This sounds like a homework question. What have you tried?

LOL
thanks

self esteem under my feet

anyway, i've tried

it's not like

for($a=0;$a<2;$a++)
for($b=0;$b<2;$b++)
for($c=0;$c<2;$c++)

because i cannot pre-determine the number of array items

for() * 3 item in array example (for()for()for(){})

but the array can be also of 2, 4, 5 items

please better read my question, it's not easy as you think 😃

bye

[laserlight]

Wes wrote:

self esteem under my feet

Be more confident 🙂

Wes wrote:

it's not like

for($a=0;$a<2;$a++)
for($b=0;$b<2;$b++)
for($c=0;$c<2;$c++)

because i cannot pre-determine the number of array items

The first thing to check: is the number of inner arrays fixed? That is, will you only have three arrays? If so, then your hard coding of the nested loops is correct. The only problem is that instead of arbitarily looping for two iterations, you should be iterating each nested loop for as many elements as each array contains, e.g., by using [man]count/man, or by using foreach loops instead of for loops.

[Wes]

i've tried, sorry

the problem is not the type of cycle, but the way to use it

can you help me?

thank you

[laserlight]

Wes wrote:

the problem is not the type of cycle, but the way to use it

What do you mean?

[Wes]

i'm sorry, english isn't my language

i mean... if i use foreachs instead of fors, i do not resolve the problem

please try, it's not easy

[laserlight]

Wes wrote:

i mean... if i use foreachs instead of fors, i do not resolve the problem

You can use either, and if your algorithm is correct, it will work, otherwise it won't 😉
I am still not clear on whether the number of inner arrays is fixed. If it is not, then you need to accomodate that fact.

[Wes]

it is not fixed!

array[] 1,
array[][] 1,

[Wes]

laserlight;10901637 wrote:

You can use either, and if your algorithm is correct, it will work, otherwise it won't 😉
I am still not clear on whether the number of inner arrays is fixed. If it is not, then you need to accomodate that fact.

i try to better explain the problem

if i know that the parent array is size = 3

i can do:

for($a = 0; $a<sizeof($parentarray[0]);$a++)
for($b = 0; $b<sizeof($parentarray[1]);$b++)
for($c = 0; $c<sizeof($parentarray[2]);$c++)
echo
$parentarray[0][$a] .
$parentarray[1][$b] .
$parentarray[2][$c];

but i don't know the size of the parent array
so i cant do:

for size==3:
for()for()for(){}

because the size can be 4 too:
for()for()for()for(){}

or 5:
for()for()for()for()for(){}

etc.

bye

[laserlight]

That's good, your analysis of the problem is correct. Now, as a hint to the solution: since you cannot hard code the nested loops, you need to loop over the arrays.

[Wes]

laserlight;10901642 wrote:

That's good, your analysis of the problem is correct.

yeah i already know this :glare:😃😃😃

still convinced that is an homework?

[laserlight]

Wes wrote:

still convinced that is an homework?

Yes. At the very least, it is a self-assigned piece of homework. I had to do something similiar when I wrote a program to generate arbitrary truth tables, but no one else ever assigned me that piece of homework.

[Wes]

yeah self assigned
****ing teacher of me!
i hate me!

😃

can you help me?

[cretaceous]

hey Wes - you have a very great expert in Laserlight trying to help you
dont expect Laserlight to write the solution for you

think it through and you should be able to figure it out especially as you have the inner part figured out

[djjjozsi]

try with foreach

to tell you the truth, you can find a solution on google in the first page. search on what you want to do with an array 🙂