php recognize associative array vs indexed array code example

Example 1: php check array is not associative

count(array_filter(array_keys($array), 'is_string')) === 0

Example 2: check array is associative laravel

// true
$isAssoc = Arr::isAssoc([
    'associative' => 'array'
]);

// false
$isAssoc = Arr::isAssoc([
    0 => 'A',
    1 => 'B',
    2 => 'C'
]);