John Davidson

Message:

For some reason, in one environment, when I insert a value into an array, it pushes with a negative index. The 'original' and 'newOne' are just to show how I am manipulating the array before getting to the weird part, I'm not sure if this is related to the problem:

$original = [];

$original[-7] = 'first';

$original[-6] = 'second';



$newOne = [];



$newOne = $original + $newOne;



$newOne[] = 'third';

printing this:

Array

(

    [-7] => first

    [-6] => second

    [-5] => third

)

In another environment and in 3 different online PHP websites that I tested, the code above would work out as expected, printing:

Array

(

    [-7] => first

    [-6] => second

    [0] => third

)

In those online PHP websites I've tested from PHP 5.6 to 8.1 and the result was aways this.

My question is: Why does the index from $newOne[] = 'third'; becomes -5, when it should always be 0?

---

My Answer:
first
[-6] = second
[0] = third
_)