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Doc Bug #5867 traversing directory is somewhat tricky
Submitted: 2000-07-31 11:46 UTC Modified: 2000-08-04 11:05 UTC
From: pasha at zend dot com Assigned:
Status: Closed Package: Documentation problem
PHP Version: 4.0 Latest CVS (31/07/2000) OS: not relevant
Private report: No CVE-ID: None
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From: pasha at zend dot com
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 [2000-07-31 11:46 UTC] pasha at zend dot com 
this the classical example (from the maual) how to traverse files in the directory:

$d = opendir ('.');
while ($file = readdir($d))
{
	print ("$file\n");
}
closedir ($d);

unfortunately this is wrong. if the directory contains file named '0', the "while" condition evaluates to false and the loop stops.

the ugly workaround is to use something like

while (! is_bool ($file = readdir ($d))

but of course I would prefer to be able to use the clear former syntax. My overall impression that the notion of what is true and what is false in the current php is somewhat broken.

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 [2000-07-31 12:08 UTC] waldschrott@php.net 
You?re wrong. That is how autoconversion works.
You?ve to use
while (($file=readdir($d))!==FALSE) ...

That?s no ugly workaround and catches all cases. If it was a
bug it was "Scripting engine problem" (not "Misbehaving
function", but this documented in some places thus I?m
unsure if we can make it a "Documentation problem".
Thus closed, although it could be pointed out more clearly
(I think it is mentioned at the strpos() documentation)
 [2000-07-31 12:10 UTC] stas@php.net 
It is not misbehaving function, it is wrong manual example.
Should be something like:
while (($file = readdir($d)) !== false) 

I'd also propose not to convert "0" to false, only '0'.
 [2000-07-31 12:11 UTC] waldschrott@php.net 
BTW, I failed introducing a new operator that regards this
speciality in zends autoconversion, I proposed a kind of !!
to check against equality with FALSE.
Core-devs thought it is not necessary ... perhaps it?s true,
perhaps not.
 [2000-07-31 12:12 UTC] waldschrott@php.net 
Transforming into "documentation problem"
 [2000-08-04 11:05 UTC] hholzgra@php.net 
fixed in latest manual cvs
 
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