Alternate to array_column()

Question

I have used array_column() in a project, and after uploading I found out that only PHP 5.5 or above support this function, and I think the hosting I use don\'t

Answer 1

You can also use array_map() function if you haven't array_column() because of PHP<5.5:

Example:

$a = array(
    array(
        'id' => 2135,
        'first_name' => 'John',
        'last_name' => 'Doe',
    ),
    array(
        'id' => 3245,
        'first_name' => 'Sally',
        'last_name' => 'Smith',
    )
);

array_column($a, 'last_name');

Becomes:

array_map(function($element) {
  return $element['last_name'];
}, $a);

So it your case the code will be:

array_count_values(
  array_map(function($arr) use ($idForBar) {
    return $arr[$idForBar];
  }, $queryResultArray)
);

This above is working on PHP 5.3.0 and above!

If you have < PHP 5.3.0, as you wrote PHP 5.2.17, just use simple function:

function get_field_data($array, $field, $idField = null) {
    $_out = array();

    if (is_array($array)) {
        if ($idField == null) {
            foreach ($array as $value) {
                $_out[] = $value[$field];
            }
        }
        else {
            foreach ($array as $value) {
                $_out[$value[$idField]] = $value[$field];
            }
        }
        return $_out;
    }
    else {
        return false;
    }           
}

And the usage:

$output = get_field_data($queryResultArray, $idForBar);