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Remove non-digits from all values in a flat array

If you have a flat array containing values with non-digits, and you want to remove these non-digits, you can use various methods.
One approach is to use the array_splice() function. Here's an example:
array_splice($milestone, 0, 1);
dump($milestone);
In this example, we're using array_splice() to remove the first element of the $milestone array. This should effectively remove any non-digits from the first value in the array.
Another option is to use the array_values() function. This function renumbers the array keys, and returns a new array with the renumbered keys. Here's an example:
$milestones = array_values($milestones);
If $milestones is a collection, you can use the values() method to achieve the same result:
$milestones = $milestones->values();
The values() method will call array_values() on your items defined in your collection instance.
Another approach mentioned in the source is using the str_replace() function to remove specific characters from the array values. Here's an example:
$milestones = str_replace(array('[', ']', '"'),'',$milestones);
In this example, we're using str_replace() to remove square brackets and double quotes from the $milestones array values. This can be useful if you have values that contain these characters.

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