Question

$example = 
  array
    'test' =>
      array(
        'something' => 'value'
      ),
    'whatever' =>
      array(
        'something' => 'other'
      ),
    'blah' =>
      array(
        'something' => 'other'
      )
  );

I want to count how many of $example‘s subarrays contain an element with the value other.

What’s the easiest way to go about doing this?

Answer 1

array_filter() is what you need:

count(array_filter($example, function($element){

    return $element['something'] == 'other';

}));

In case you want to be more flexible:

$key = 'something';
$value = 'other';

$c = count(array_filter($example, function($element) use($key, $value){

    return $element[$key] == $value;

}));