=2, is_ref=0)=array (0 => (refcount=0, is_ref=0)=0, 1 => (refcount=0, is_ref=0)=1, 2 => (refcount=0,...is_ref=0)=2)
b: (refcount=2, is_ref=0)=array (0 => (refcount=0, is_ref=0)=0, 1 => (refcount=0, is_ref...=0)=1, 2 => (refcount=0, is_ref=0)=2)
after write
a: (refcount=1, is_ref=0)=array (0 => (refcount=0,...is_ref=0)=0, 1 => (refcount=0, is_ref=0)=1, 2 => (refcount=0, is_ref=0)=2)
b: (refcount=1, is_ref=0)=...array (0 => (refcount=0, is_ref=0)=0, 1 => (refcount=0, is_ref=0)=88, 2 => (refcount=0, is_ref=0)=2)