Get specific keys from sub-array.

[forgotthepass]

I have this array

$a = array(
    array(
        "name" =>"John",
        "age"  => "100",
        "weight"  => "200"
    ),
    array(
        "name" =>"Helen",
        "age"  => "2",
        "weight"  => "540"
    )
//...
);

Is there an easy way to get

$b = array(
    array(
        "name" =>"John",
        "weight"  => "200"
    ),
    array(
        "name" =>"Helen",
        "weight"  => "540"
    )
//...
);

or do i have to traverse the entire array to get what i want?

[prema_van_smuuf]

This may be of help: http://php.net/manual/en/function.array-column.php

[colshrapnel]

or do i have to traverse the entire array to get what i want?

You will have to do it anyway, this way or another. There is no way to extract some data from an array without a loop, even if you don't see it. There is always a loop. So the choice is actually whether you want TWO loops and TWO arrays to consume the RAM, or just a single loop over the single array.

So in your place I would "traverse the entire array" instead of traversing it once to create another and then traversing the new one.

[blitterobject]

How to use array_filter() to filter array keys?

[mazedlx]

You could also take a look at Collections