Arr::check(array $array, mixed|callable $condition, int $flag = 0): bool


Check if some or every array element meets specified condition.

If CHECK_SOME flag is NOT present then every array element must meet specified condition in order to pass check.


$condition type



Callable should return truthy or falsy value (while using CHECK_STRICT flag, return values other than true are treated as false).

Callable is supplied with either only element value (function($value)) or pair of element value and key (function($value, $key)) as arguments. Arguments amount depend on callable definition and is dynamically resolved using reflection (defaults to 2 - value and key)


If condition type is different than callable then every array element is compared against it value.

$value == $condition by default

$value === $conditionif CHECK_STRICT flag is enabled


Can be used as stand alone (i.e.Arr::CHECK_STRICT) as well as in conjunction (i.e. Arr::CHECK_STRICT | Arr::CHECK_SOME)

$flag argument used to be a boolean parameter called $strict

But do not worry, it it is fully backward compatible due to in-flight type conversion from bool to int

Constant name



In case condition is callable check if it result is exactly true

If condition is not callable, then check if array element is equal to it both by value and type

See Condition section for more info


Check will return true on first array element that match specified condition or false if none of them matches it.

By default check method will return true only if ALL of array elements meet specified condition


$array = [1, '1', true];
// Every array element is EQUAL to 1 ($value == '1')
Arr::check($array, '1') -> true
// Only one array element is the SAME as 1 ($value === '1') which is not sufficient
Arr::check($array, '1', Arr::CHECK_STRICT) -> false
// When CHECK_SOME flag is present, one element is sufficient to pass check
Arr::check($array, '1', Arr::CHECK_STRICT | Arr::CHECK_SOME) -> true
// You can also use built-in functions to validate whole array
Arr::check($array, 'is_int') -> false
Arr::check($array, 'is_string') -> false
// When CHECK_SOME flag is present only one element need to meet specified condition
Arr::check($array, 'is_int', Arr::CHECK_SOME) -> true
Arr::check($array, 'is_string', Arr::CHECK_SOME) -> true
// Every value of array is truthy
Arr::check($array, function ($value) { return $value; }) -> true
// Above check can be simplified to
Arr::check($array, true) -> true
// Or even shorter
Arr::check($array, 1) -> true
// When CHECK_STRICT flag is present, check will fail for callback return values other true
Arr::check($array, function ($value) { return $value; }, Arr::CHECK_STRICT) -> false
// But when callback is written as follows check will pass
Arr::check($array, function ($value) { return boolval($value); }, Arr::CHECK_STRICT) -> true
// Above check will pass if we add CHECK_SOME flag cause of of the elements is exactly true
Arr::check($array, function ($value) { return $value; }, Arr::CHECK_STRICT | Arr::CHECK_SOME) -> true
// Callback function arguments count is automatically detected
Arr::check($array, function ($value, $key) { return $value > $key; }) -> false
// First array element 1 is greater than its key 0
Arr::check($array, function ($value, $key) { return $value > $key; }, Arr::CHECK_SOME) -> true