什么改变循环中的条件：while（mysql_fetch_array（$ var））？

Question

I'm a beginner C programmer. I recently started learning PHP and MySQL and encountered this interesting behavior with while loop:

while ($pages = mysql_fetch_array($pages_set))
    {statement}

I previously learned that condition must be changed somewhere in the loop (or in the expression itself) in order for the loop to be finite, but in this case i just can't see it.

I researched a bit about mysql_fetch_array() function and found this:

Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.

Is it true to say that the pointer moves through the row and when it reaches the end it will return 0 or NULL?

Answer 1

The pointer moves to the next row in the recordset with each iteration, so that when there is no data left then $pages will be NULL and the loop will end.