php_stream_cast to fd

17 years ago by Joe Orton — view source

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When php_stream_cast is passed any of the _AS_FD-like options, what is
the ret argument supposed to point to? This does not seem to be decided
consistently; from a quick survey:

ext/openssl/xp_ssl.c:
php_openssl_sockop_cast() presumes that *ret has sizeof(void *)
ext/soap/php_http.c:
stream_alive() presumes that *ret has sizeof(long)
ext/standard/streamfuncs.c:
stream_array_from_fd_set() presumes that *ret has sizeof(php_socket_t)
main/streams/xp_socket.c:
php_sockop_cast() presumes that *ret has sizeof(int)

On 64-bit platforms, of course, at least half of these cases will break,
since sizeof(int) != sizeof(long).

This issue is the cause of http://bugs.php.net/bug.php?id=32979, where a
64-bit value is being written to an pointer to a 32-bit value on the
stack, and trashing whatever follows it.

joe

17 years ago by Scott McNaught [Synergy 8] — view source

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Hey guys,

I don’t know whether to post this as a bug or not. But I was tricked when programming today.

It seems that the character "*" is non-strictly equivalent to 0. Is this the correct behavior or am I missing something?

Test case:

<?php

var_dump('*' == 0);

?>

Shows boolean(true).

I was unable to find any documentation as to why this would be the case.

Regards,

Scott

17 years ago by Antony Dovgal — view source

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Hey guys,

I don’t know whether to post this as a bug or not. But I was tricked when programming today.

It seems that the character "*" is non-strictly equivalent to 0.
Is this the correct behavior or am I missing something?

http://www.php.net/manual/en/language.operators.comparison.php

Ask such questions in php-general@, please. Thank you.

--
Wbr,
Antony Dovgal

17 years ago by Alexey Zakhlestin — view source

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I don't know whether to post this as a bug or not. But I was tricked when programming today.

It seems that the character "*" is non-strictly equivalent to 0. Is this the correct behavior or am I missing something?

Test case:

<?php

var_dump('*' == 0);

?>

Shows boolean(true).

I was unable to find any documentation as to why this would be the case.

try

<?php
echo intval("*");
?>

that should explain the situation ;)

--
Alexey Zakhlestin
http://blog.milkfarmsoft.com/

17 years ago by Pierre Joye — view source

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On Tue, Mar 11, 2008 at 11:17 AM, Scott McNaught [Synergy 8]
scott.mcnaught@synergy8.com wrote:

Hey guys,

I don't know whether to post this as a bug or not. But I was tricked when programming today.

It seems that the character "*" is non-strictly equivalent to 0. Is this the correct behavior or am I missing something?

Test case:

<?php

var_dump('*' == 0);

?>

Shows boolean(true).

I was unable to find any documentation as to why this would be the case.

http://www.php.net/manual/en/language.operators.comparison.php

--
Pierre
http://blog.thepimp.net | http://www.libgd.org

17 years ago by Scott McNaught [Synergy 8] — view source

unread

"If you compare an integer with a string, the string is converted to a
number. If you compare two numerical strings, they are compared as
integers." Well... I just feel stupid now :)

I am writing something which is extracting parts of a crontab. The variable
contained "*" was being compared to 0.

This would have clicked for me had it been anything else, but because it was
"*" my thoughts were that there was some new wild-card thing going on that I
hadn't heard about.

Cheers guys and sorry for my dumb post!

Scott

-----Original Message-----
From: Pierre Joye [mailto:pierre.php@gmail.com]
Sent: Tuesday, March 11, 2008 8:25 PM
To: Scott McNaught [Synergy 8]
Cc: internals@lists.php.net
Subject: Re: [PHP-DEV] Comparison: ('*' == 0) ... True or false

On Tue, Mar 11, 2008 at 11:17 AM, Scott McNaught [Synergy 8]
scott.mcnaught@synergy8.com wrote:

Hey guys,

I don't know whether to post this as a bug or not. But I was tricked
when programming today.

It seems that the character "*" is non-strictly equivalent to 0. Is this
the correct behavior or am I missing something?

Test case:

<?php

var_dump('*' == 0);

?>

Shows boolean(true).

I was unable to find any documentation as to why this would be the case.

http://www.php.net/manual/en/language.operators.comparison.php

--
Pierre
http://blog.thepimp.net | http://www.libgd.org