PHP : Insert an array into another array

Question

I'm trying to normalize a string of comma-separated numbers, and a range as well. To demonstrate:

the array :

$array = ["1","2","5-10","15-20"];

should become :

$array = [1,2,5,6,7,8,9,10,15,16,17,18,19,20];

The algorithm i'm working on is :

//get the array values with a range in it :
$rangeArray = preg_grep('[-]',$array);

This will contain ["5-10", "16-20"]; Then :

foreach($rangeArray as $index=>$value){
    $rangeVal = explode('-',$value);
    $convertedArray = range($rangeVal[0],$rangeVal[1]);
}

The converted array will now contain ["5","6","7","8","9","10"];

The problem I now face is that, how do I pop out the value "5-10" in the original array, and insert the values in the $convertedArray, so that I will have the value:

$array = ["1","2","5","6","7","8","9","10","16-20"];

So, how do I insert an array into an array? Or is there a cleaner way to solve this kind of problem? converting array of both numbers and range values to array of properly sequenced numbers?

Answer 1

you did not finish a little

$array = ["1","2","5-10","15-20"];
// need to reverse order else index will be incorrect after inserting
$rangeArray = array_reverse( preg_grep('[-]',$array), true);

$convertedArray = $array;

foreach($rangeArray as $index=>$value) {

    $rangeVal = explode('-',$value);
    array_splice($convertedArray, $index, 1, range($rangeVal[0],$rangeVal[1]));
}

print_r($convertedArray);