PHP if in_array() how to get the key as well?

Question

Struggling with a tiny problem.

I have an array:

Array
(
    [0] => 
    [6] => 6
    [3] => 5
    [2] => 7
)

I am chec

Answer 1

In case anyone need it in array of arrrays. My case was this:

I had an array like this:

$myArray =

array:3 [▼
  0 => array:3 [▼
    0 => 2
    1 => 0
    2 => "2019-07-21 23:59:59"
  ]
  1 => array:3 [▼
    0 => 3
    1 => 2
    2 => "2019-07-21 23:59:59"
  ]
  2 => array:3 [▼
    0 => 1
    1 => 1
    2 => "2019-07-21 23:59:59"
  ]
]

And another one like this (an array of objects):

$Array2 = 

Collection {#771 ▼
  #items: array:12 [▼
    0 => {#1047 ▼
      +"id": 2
      +"name": "demografico"
      +"dict_key": "demographic"
      +"component": "Demographic"
      +"country_id": null
      +"created_at": null
      +"updated_at": null
    }
    1 => {#1041 ▶}
    2 => {#1040 ▶}
    etc...

As the OP, I had to "do something" (use values in a html php template, my case Laravel with blade) with the key where some value was in the array. For my code, I had to use this:

foreach($Array2 as $key => $item)
    if(false !== $key = array_search($item->id, array_column($myArray, 0))
    // Note that $key is overwritten