Randomly selecting from previous randomly selected elements from array PHP - php

Question

First, i created an array of, let`s say, 6 elements. Then i randomly pick 4 elements that are GOOD (on random position i mean).
Now, i want to randomly pick 2 out of those 4 selected that are VERY GOOD.
If the value of array1 is the same with array2, then i want it to say VERY GOOD. Else, say GOOD. If the value is 0, then BAD.
I tried allpossibilities and all failed.
This is my last attempt of doing so...
$array1 = array();
$array2 = array();
while (count($array1) < 4) {
$rand = rand(1,6);
if (!isset($array1[$rand])) {
$array1[$rand] = TRUE;
}
}
while (count($array2) < 2) {
$rand = rand(1,4);
if (!isset($array2[$rand])) {
$array2[$rand] = TRUE;
}
}
$array2 = $array2 + array_fill(1, 4, FALSE);
$array1 = $array1 + array_fill(1, 6, FALSE);
ksort($array1);
ksort($array2);
foreach($array1 as $k => $v){
if ($v != 0)
{echo "GOOD<br>";}
else {echo "BAD<br>";}}
foreach($array2 as $kc => $vc){
if ($v2 !=0)
{echo "VERY GOOD<br>";}
else {echo "BAD<br>";}}
This is what it gives me:
GOOD
GOOD
BAD
GOOD
GOOD
BAD
VERY GOOD
BAD
BAD
VERY GOOD
As you can see, it gave me 4/6 GOODS and then 2/6 VERY GOODS.
What i wanted was 4/6 GOODS and from those 4 selected i want 2/4 VERY GOODS.
How can i do this?
Thanks in advance,
Vlad

Answer 1

You want one array of size 6 so why are you creating multiple? You can either merge them in some fashion or use the first in construction of the second.
But first, I want to point out that the while() loops are very similar, so it should be easy to put that into a function and save some code to write and have a codebase that is better manageable, as you only need to edit one place to have immediate effect instead of many.
Now for the first task, all you need is the $number of elements to be created and the $range. This function will do what one of your while() loops did plus the array_fill(). (demo)
function fillRandom($range, $num = 1) {
$data = array_fill($range[0], $range[1]+1, FALSE);
for ($i=0; $i<$num; $i++) {
do {
$key = mt_rand($range[0], $range[1]);
} while ($data[$key] === TRUE);
$data[$key] = TRUE;
}
return $data;
}
Now comes the more advanced part: In the second run, we can identify 2 out of the 4 TRUE in the array of 6 elements by giving them another $value (as an example).
The $data will be needed in some cases and by using an $anonymous function we can allow the condition for the while() to be passed.
function fillRandom($range, $num = 1, $value = TRUE, $data = array(), $anon = NULL) {
if (empty($data))
$data = array_fill($range[0], $range[1]+1, FALSE);
if ($anon === NULL) {
$anon = function($el) use($value) {
return $el !== $value;
};
}
for ($i=0; $i<$num; $i++) {
do {
$key = mt_rand($range[0], $range[1]);
} while (isSet($data[$key]) && !$anon($data[$key]));
$data[$key] = $value;
}
return $data;
}
You can then do something like this (demo)
$input = fillRandom(array(0, 5), 4);
ksort($input);
print_r($input);
$input = fillRandom(array(0, 5), 2, 2, $input, function($el){
return $el === TRUE;
});
ksort($input);
print_r($input);