Weapon#bulletKillType

This controls how the bullets will be killed. The default is Phaser.Weapon.KILL_WORLD_BOUNDS.

There are 7 different "kill types" available:

• Phaser.Weapon.KILL_NEVER
  The bullets are never destroyed by the Weapon. It's up to you to destroy them via your own code.

• Phaser.Weapon.KILL_LIFESPAN
  The bullets are automatically killed when their bulletLifespan amount expires.

• Phaser.Weapon.KILL_DISTANCE
  The bullets are automatically killed when they exceed bulletDistance pixels away from their original launch position.

• Phaser.Weapon.KILL_WEAPON_BOUNDS
  The bullets are automatically killed when they no longer intersect with the Weapon.bounds rectangle.

• Phaser.Weapon.KILL_CAMERA_BOUNDS
  The bullets are automatically killed when they no longer intersect with the Camera.bounds rectangle.

• Phaser.Weapon.KILL_WORLD_BOUNDS
  The bullets are automatically killed when they no longer intersect with the World.bounds rectangle.

• Phaser.Weapon.KILL_STATIC_BOUNDS
  The bullets are automatically killed when they no longer intersect with the Weapon.bounds rectangle.
  The difference between static bounds and weapon bounds, is that a static bounds will never be adjusted to
  match the position of a tracked sprite or pointer.