Unable to convert indexed array to associative array in php

The array $digit now has data in this form :

'numbers' => 
  array (
    0 => '1,2,3',
  )

But I need that array in the below shown form:

'numbers' => 
  array (
    0 => 1,
    1 => 2,
    2 => 3,
  ),

How to achieve this?

I tried the below things. But all those are returning data in same form as I currently have .Any help is appreciated.

Method 1:

$newDigitsArray=[];
$i=0;
foreach( $digit[$i] as $key =>$value) { 
    $newDigitsArray['numbers']= [$i => $value];
    $i++;
}
\Log::info($newDigitsArray);

Method 2:

$newDigitsArray=[];
for($i=0;$i<count($digit);){
    $newDigitsArray[$i]=$digit[$i];
    $i++;
}
 \Log::info($newDigitsArray);

>Solution :

You can use the built-in php method explode to achieve this easily:

> $digits = ['numbers' => '1,2,3']
= [
    "numbers" => "1,2,3",
  ]

> $digits['numbers'] = explode(',', $digits['numbers'])
= [
    "1",
    "2",
    "3",
  ]

> $digits
= [
    "numbers" => [
      "1",
      "2",
      "3",
    ],
  ]

>