在PHP中，文件指针在内部函数结束时自动关闭

I have tried googling this, tried reading the PHP manual for fclose(), but I can't find the answer to this question.

Say I have a PHP file with 2 functions: function A and function B. I fopen() a file pointer in function A:

$filepointer = fopen( $file, 'w');

Let's say I DON'T fclose() the file pointer in function A, but function A reaches its end naturally.

Now I'm in function B. Is the file pointer still available in function B ?