Working with an array

PHP
1

I have

Array
(
    [0] => Array
        (
            [beginning_ru] => 33.0
            [ending_ru] => 33.5
            [beginning_x] => 0.0
            [external_width] => 17.500
            [external_height] => 0.500
            [rack_mounting_direction] => Front
            [operational_status] => 1
        )

    [1] => Array
        (
            [beginning_ru] => 27.0
            [ending_ru] => 30.0
            [beginning_x] => 0.0
            [external_width] => 17.500
            [external_height] => 1.750
            [rack_mounting_direction] => Front
            [operational_status] => 1
        )

)

am trying to create a new array from it using only the begining_ru and ending_ru keys.
like

Array
(
    [0] => Array
        (
            [beginning_ru] => 33.0
            [ending_ru] => 33.5
        )

    [1] => Array
        (
            [beginning_ru] => 27.0
            [ending_ru] => 30.0
        )

)
2

Why? Can’t you just ignore all keys you don’t need?

6 Likes
3

Unless you’re pulling absolutely massive amounts of records (where size-in-memory becomes a concern), @rpkamp is 100% correct, there’s no mechanical benefit to doing this.

2 Likes
4

What if he wants to save the array as JSON and does not need the other data?

5
  1. Why doesn’t the data already just have the items you want, from whatever the query/code is that’s getting the data?
  2. As already asked, why can’t you just ignore the extra items?
  3. If you cannot do items #1 or #2 on this list, I would write a call-back function to just keep the array keys you want (see array_intersect_key()) and apply it to all the sub-arrays in the data using array_map().
1 Like
6

your right, ill use the existing array and ignore the other keys.

1 Like
7

the second one seems good
I want the function to run when a form is submitted though

<form...  onSubmit="detectCollision(frontAssets)">
...
</form>
...
// just have the function return true or false
function detectCollision(assets = []) {    
  const selectValue	= document.getElementById('Beginning_ru').value;

  return assets.some((asset) => selectValue > asset['beginning_ru'])
}z

if (detectCollision(frontAssets)) {
  document.getElementById('Collision').scrollIntoView()
}

Should I put the if statement inside the function?

8

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