PHP foreach dynamic an array - php

Question

Thank you at first.
CODE:
$flag=1;
foreach( $questionidset as $oneqid)
{
if($oneqid%23==0)
{
if($flag<3)
{
array_push($questionidset, 23*$flag);
$flag++;
}
}
}
print_r($questionidset);
QUESTION:
how to make the foreach get dynamic $questionidset after being pushed a new element.
Such as, the original $questionidset is {1,2,23}
The output should be : {1,2,23,23,46}
My purpose is that after pushing a new element to the original array named $questionidset, the foreach loop times can get an increment

Answer 1

Try this,
$flag = 1;
$length = 2;
$questionidset = [1, 2, 23];
for ($i = 0; $i < count($questionidset); $i++) {
if ($questionidset[$i] % 23 == 0) {
$questionidset[] = 23 * $flag;
$flag++;
if( $flag > $length )
break;
}
}
print_r($questionidset);
//This outputs : [1,2,23,23,46]
//if you increase length to 5
//The output will be : [1,2,23,23,46,69,92,115]
Not sure why it does not iterate for n times where n is the number of elements in output,
But you can always solve the problem with recursion like below, it iterates exactly n times where n is the number of elements in output.
$flag = 1;
$length = 2;
$questionidset = [1, 2, 23];
$count = count($questionidset);
$start = 0;
function for_loop(&$arr, $count, $i, &$flag, $length) {
if ($i+1 > $count)
return;
if ($arr[$i] % 23 == 0) {
$arr[] = 23 * $flag;
$flag++;
$count++;
$i++;
if($flag > $length)
return;
else
for_loop($arr, $count, $i, $flag, $length);
}
$i++;
for_loop($arr, $count, $i, $flag, $length);
}
for_loop($questionidset, $count, $start, $flag, $length);
print_r($questionidset);
Note:- Some parameters are passed by reference.