Unity Script Reference:

static function OverlapCircleAll(point: Vector2, radius: float, layerMask: int = DefaultRaycastLayers, minDepth: float = -Mathf.Infinity, maxDepth: float = Mathf.Infinity): Collider2D[];

static Collider2D[] OverlapCircleAll(Vector2 point, float radius, int layerMask = DefaultRaycastLayers, float minDepth = -Mathf.Infinity, float maxDepth = Mathf.Infinity);

static def OverlapCircleAll(point as Vector2, radius as float, layerMask as int = DefaultRaycastLayers, minDepth as float = -Mathf.Infinity, maxDepth as float = Mathf.Infinity) as Collider2D[]

Parameters

minDepth	Only include objects with a Z coordinate (depth) greater than this value.
maxDepth	Only include objects with a Z coordinate (depth) less than this value.
point	Center of the circle.
radius	Radius of the circle.
layerMask	Filter to check objects only on specified layers.

Description

Get a list of all colliders that fall within a circular area.

This function is similar to OverlapCircle except that all colliders that fall within the circle are returned. The colliders in the returned array are sorted in order of increasing Z coordinate. An empty array is returned if there are no colliders within the circle.

Note that this function will allocate memory for the returned Collider2D array. You can use OverlapCircleNonAlloc to avoid this overhead if you need to make the check frequently.