如何使数组值连续但保持正确的顺序？

I have an dynamic array that could for example look like this:

$arr = array(42, 30, 70, 10);

I have a function called CreateOrder and I want it to return an array like this

function createOrder($array)
{

    /* 
    This function should return an array starting at 0,
    while keeping the correct order, like this:
    */

    $new_array = array(2, 1, 3, 0);

}

I have been trying and trying with foreach loops but I can't get my head around it.

Any help appreciated,

Nathan

If you don't mind the order of the original array being trashed in the process:

asort($arr);
$new_array = array_combine(array_keys($arr), range(0,count($arr)-1));
ksort($new_array);

Not so bad inside a function, because that uses a copy of the original array unless you pass by reference, so only the order of the locally-function-scoped copy gets trashed

Or even more simply:

asort($arr);
$new_array = array_keys($arr);
asort($new_array);
$newArr = array_keys($new_array);

Maybe the asort() function will fit your needs: http://php.net/manual/de/function.asort.php

Don't forget to pass your array by reference, so this has to be called as is (without an assignment).

• Clone the array.
• Sort the cloned array in ascending order.
• For each element in the original array search for key in sorted array, and insert the returned position in the new array.
• return the position array.

Following code will help

function createOrder($array){
    $cloneArray = asort($array);
    $positionArray = []; 

    foreach($cloneArray as $element){
       $positionArray[] = array_search($element,$array);
    }  

    return $positionArray; 
}