Delete first item in array and keep keys index

Question

I'm trying to delete the first key and value from an array while keeping the keys.

I can't seem to get this working with all the array possibilities.

Here's my $mag_cats_arr:

Array ( [6] => Science [9] => hashgraph [4] => Blockchain )

With array_slice, the keys are reset, but I need them:

$mag_cats_arr = array_slice($mag_cats_arr,1);
Array ( [0] => hashgraph [0] => Blockchain ) (Science is gone here)

How do I keep the keys when removing the first ([6] => Science) in this array?

Do you just want to remove it or do you actually want the value too? If the former, see unset(). — Patrick Q
– Patrick Q, Commented Oct 10, 2018 at 18:55

Dormilich · Accepted Answer · 2018-10-10 18:58:21Z

3

With array_slice, the keys are reset

array_slice() has a fourth parameter that prevents re-indexing the result array. Cf. http://php.net/array-slice

answered Oct 10, 2018 at 18:58

Dormilich

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3 Comments

KJS Over a year ago

Thanks! I should read better, but now I have this: $mag_cats_arr = array_slice($mag_cats_arr,1,99,TRUE); - Is there like an infinite value for 99? For when you don't know how big the array is?

KJS Over a year ago

I fixed that comment above with: count($mag_cats_arr);

Dormilich Over a year ago

use NULL (as shown in the function description) or count($mag_cats_arr).

Forbs · Accepted Answer · 2018-10-10 19:03:39Z

1

simple, assuming you want to remove the first element of the array and have not done a foreach or other process on it.

 unset($mag_cats_arr[key($mag_cats_array)]);

The key() function returns the first element (or wherever the pointer is) and unset removes it.

Note : if you have done some operations on the array (such as a loop) then don't forget to reset the array

edited Oct 10, 2018 at 19:03

answered Oct 10, 2018 at 18:55

Forbs

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3 Comments

Mike Doe Over a year ago

Note : if you have done some operations then don't forget to reset the array say what?

Forbs Over a year ago

if you run the array through any loop or you move the index pointer you need to do reset($mag_cats_array); to set it back to beginning

Forbs Over a year ago

Not sure what you mean? reset, unset, and key are all PHP4 - 7 functions. array_slice didn't support preserve keys in PHP4 - Oh , he deleted his comment

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