Question

I have an array as follows

array(2) {
  ["operator"] => array(2) {
    ["qty"] => int(2)
    ["id"] => int(251)
  }
  ["accessory209"] => array(2) {
    ["qty"] => int(1)
    ["id"] => int(209)
  }
  ["accessory211"] => array(2) {
    ["qty"] => int(1)
    ["id"] => int(211)
  }
}

I’m trying to find a way to verify an id value exists within the array and return bool. I’m trying to figure out a quick way that doesn’t require creating a loop. Using the in_array function did not work, and I also read that it is quite slow.

In the php manual someone recommended using flip_array() and then isset(), but I can’t get it to work for a 2-d array.

doing something like

if($array['accessory']['id'] == 211)

would also work for me, but I need to match all keys containing accessory — not sure how to do that

Anyways, I’m spinning in circles, and could use some help.
This seems like it should be easy. Thanks.

Answer 1

array_walk() can be used to check whether a particular value is within the array; – it iterates through all the array elements which are passed to the function provided as second argument. For example, the function can be called as in the following code.

function checkValue($value, $key) {
  echo $value['id'];
}

$arr = array(
  'one' => array('id' => 1),
  'two' => array('id' => 2),
  'three' => array('id' => 3)
);

array_walk($arr, 'checkValue');