Array push as the first index PHP

问题:

I have an array that doesn't use the 0 index. The array starts from 1,2,3. So I would like to add to the array. I tried do array_push($array, "Choose City"), but this ends up at the end of the array, with array index 4 in this case.

How can I set it to be the array index 0?

回答1:

http://php.net/manual/en/function.array-unshift.php

array_unshift($array, "Choose City")

or you can do it manually

回答2:

I think you are looking for array_unshift() - this adds an element to the beginning of the array, rather than the end, without overwriting any existing elements.

However, the array will now be indexed starting at 0...

回答3:

If you know that Index 0 is not used you can simply assign it:

$array[0] = "Choose City";