rationale explanation, please?

[intenz]

http://www.php.net/manual/en/function.readdir.php

/ This is the correct way to loop over the directory. /
while (false !== ($file = readdir($handle))) {

/ This is the WRONG way to loop over the directory. /
while ($file = readdir($handle)) {

WHY is while ($file = readdir($handle)) { WRONG?

Only rationale answers, please.

[Weedpacket]

See the manual entry for [man]readdir[/man]:

Please note the fashion in which readdir()'s return value is checked in the examples below. We are explicitly testing whether the return value is identical to (equal to and of the same type as--see Comparison Operators for more information) FALSE since otherwise, any directory entry whose name evaluates to FALSE will stop the loop (e.g. a directory named "0").