offset array within array php

Question

I have a multidimensional array in this format

[0] => Array
    (
        [0] => Supplier
        [1] => Supplier Ref
    )

I basically need to offset every array with a new field at the beginning, so the outcome should be:

[0] => Array
    (
        [0] => New Field
        [1] => Supplier
        [2] => Supplier Ref
    )

If I can run a loop through each array using for/foreach then that would be great but I'm struggling to find a good method of doing this. Any ideas?

Thanks

array_unshift() array_unshift — Prepend one or more elements to the beginning of an array -> $array = array_unshift($array,'New Field'); — Sean
– Sean, Commented Sep 25, 2014 at 16:31
^^^In context of your loop: foreach ($outer_array as &$inner_array) { array_unshift($inner_array, 'New Field'); } ...note the & reference... — Michael Berkowski
– Michael Berkowski, Commented Sep 25, 2014 at 16:36

knittl · Accepted Answer · 2014-09-25 16:38:55Z

2

I can think of three straightforward ways

Use a simple foreach and array_unshift

foreach($arr as &$item) {
  array_unshift($item, 'new field');
}

Use array_walk to apply array_unshift to each array item (will modify the existing array)
```
array_walk($array, function(&$item) { array_unshift($item, 'new field'); });
```
Use array_map and array_unshift (will return a new array – but the arrays inside the original array will be modified nevertheless)
```
array_map(function(&$item) {
  array_unshift($item, 'new field'); return $item;
}, $array);
```

answered Sep 25, 2014 at 16:38

knittl

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Comments

user4079229 · Accepted Answer · 2014-09-25 16:37:46Z

0

You can use array_unshift() to offset array within array php. It prepend one or more elements to the beginning of an array.

answered Sep 25, 2014 at 16:37

user4079229