PHP null reference count 0 problem

Many on the Web say $ A = NULL is a direct null for the data structure pointed to by $ A, and its reference count to 0.

But my test found that it did not return 0, the code is as follows:

$s=str_repeat('1',2);  //这和第二个例子完全相同  $p=&$s;  $s=null;  xdebug_debug_zval('s', 'p');

Print output:

s:(refcount=2, is_ref=1),nullp:(refcount=2, is_ref=1),null

The RefCount is still 2, and it's not classified as 0, and I don't know why.

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Many on the Web say $ A = NULL is a direct null for the data structure pointed to by $ A, and its reference count to 0.

But my test found that it did not return 0, the code is as follows:

$s=str_repeat('1',2);  //这和第二个例子完全相同  $p=&$s;  $s=null;  xdebug_debug_zval('s', 'p');

Print output:

s:(refcount=2, is_ref=1),nullp:(refcount=2, is_ref=1),null

The RefCount is still 2, and it's not classified as 0, and I don't know why.

$s=nullAfter this sentence is executed, S and P point to the object is null, the object's RefCount is 2, a little bit of a problem.

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