Illuminate\Support\Collection::shift PHP Method

    public function shift()
    {
        return array_shift($this->items);
    }

 public function testShiftReturnsAndRemovesFirstItemInCollection()
 {
     $c = new Collection(['foo', 'bar']);
     $this->assertEquals('foo', $c->shift());
     $this->assertEquals('bar', $c->first());
 }