PHP array of arrays: problem to push item on inner array

Question

I would like to append elements to an array that is part of another array. I add an element to $aA in this way:

$aA[] = array('label'=>"string1",'data'=>array());

By this the array will be extended by new element with the following context in json notation:

{ index:'string1',data:{}}

The array referred to by 'data' is initially empty.

A bit later I would like to append/push the elements 1,2,3 to the 'data' array in the last element of $aA. I have tried with this:

end($aA)['data'][]=1;
end($aA)['data'][]=2;
end($aA)['data'][]=3;

with the following expected content of the last element i $aA

{ index:'string1',data:{1,2,3}}

But this doesn't work. The array referred to by 'index' is still empty.

How should I do this to make it work?

Try $aA[ count( $aA ) - 1 ]['data'][] = ... instead of end($aA)... — marekful
– marekful, Commented Jan 17, 2020 at 16:40
@marekful Thanks, your proposal worked fine! Now I just wonder why end($aA) doesn't work.... — ubee
– ubee, Commented Jan 17, 2020 at 16:51
end() returns a copy of the last element in the array. Changing that will not be reflected in the original array. — marekful
– marekful, Commented Jan 17, 2020 at 16:53

Combinu · Accepted Answer · 2020-01-17 16:58:23Z

1

How about you use array_push?

array_push($aA['data'], 1);

PHP: array_push

answered Jan 17, 2020 at 16:58

Combinu

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1 Comment

ubee Over a year ago

Well, see comments on my original post. The problem is not the push operation, but how I refer to the last item on the list. Probably nothing wrong with your proposal but it will not solve my problem.

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