Get array key by value - multidimensional array

Question

I would like to get/find array key by some of array's values.

I tried array_search but this doesn't help with multidimensional arrays as I hoped.

For example I have this kind of array and I need to get all array keys where personal_code = 12345678910. In this example I should get array(0,1) because in first and second array are the personal_code 12345678910.

How could I get those keys?

Array
(
  [0] => Array
  (
    [id] => 32155
    [personal_code] => 12345678910
    [cadaster] => 12345:321:1234
    [purpose] => Purpose 1
    [address] => Blah blah 1
    [area] => 600m2
  )

  [1] => Array
  (
    [id] => 14131
    [personal_code] => 12345678910
    [cadaster] => 12345:123:4321
    [purpose] => Purpose 2
    [address] => Blah blah 3
    [area] => 1200m2
  )

  [2] => Array
  (
    [id] => 32303
    [personal_code] => 54321678910
    [cadaster] => 12345:123:1234
    [purpose] => Purpose 3
    [address] => Blah blah 2
    [area] => 1800m2
  )
)

Sadikhasan · Accepted Answer · 2014-09-15 10:20:07Z

1

$newArr = array();
foreach ($yourArr as $arr)
{
  if($arr['personal_code']==12345678910)
  {
    $newArr []=$arr;
  }
}
print_r($newArr);

answered Sep 15, 2014 at 10:20

Sadikhasan

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Kevin · Accepted Answer · 2014-09-15 10:26:28Z

1

You can just use a simple foreach to get those keys. Example:

$find = '12345678910';
$keys = array();
foreach($your_array as $key => $values) { // loop your array
    // now values will hold each array batch inside that parent array
    if($values['personal_code'] == $find) { // so it if matches
        $keys[] = $key; // then put it inside
    }
}

echo '<pre>';
print_r($keys);

Sample Demo

edited Sep 15, 2014 at 10:26

answered Sep 15, 2014 at 10:18

Kevin

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