RE: [PHP] Last time Append line to text file
-Original Message-
From: Miguel Cruz [mailto:[EMAIL PROTECTED]]
Sent: 29 April 2002 05:34
On Sun, 28 Apr 2002, Richard Emery wrote:
The answer is:
$file_pointer = fopen('/public_html/emails.txt', a) or exit;
The || is a binary operation. You want or, the
logical operation.
Yeah, Perl habit.
But || is logical too (it's | that's binary), it just seems
to result in
$file_pointer being recast from 'resource' to 'boolean' for
some reason.
This side effect is not mentioned at
http://www.php.net/manual/en/language.operators.logical.php where it
imples that the only difference is precedence. I'd say this is a bug
either in the manual or in PHP itself.
Surely this is *precisely* due to the difference in precedence. The or operator has
lower precedence than =, whereas || has higher precedence, so:
$file_pointer = fopen(...) or exit;
would be ($file_pointer = fopen(...)) or exit;
(i.e. evaluate the assignment expression first, and if it returns a false value then
exit)
whereas
$file_pointer = fopen(...) || exit;
would be $file_pointer = (fopen(...) || exit);
(i.e. evaluate the Boolean or first, casting the fopen() result in the process, then
assign the result to $file_pointer (assuming exit hasn't already terminated execution
by then!)).
So, no bug, no unexpected side-effects, just a logical result of applying the
precedence rules strictly as advertised!
Cheers!
Mike
-
Mike Ford, Electronic Information Services Adviser,
Learning Support Services, Learning Information Services,
JG125, James Graham Building, Leeds Metropolitan University,
Beckett Park, LEEDS, LS6 3QS, United Kingdom
Email: [EMAIL PROTECTED]
Tel: +44 113 283 2600 extn 4730 Fax: +44 113 283 3211
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RE: [PHP] Last time Append line to text file
On Mon, 29 Apr 2002, Ford, Mike [LSS] wrote: From: Miguel Cruz [mailto:[EMAIL PROTECTED]] This side effect is not mentioned at http://www.php.net/manual/en/language.operators.logical.php where it imples that the only difference is precedence. I'd say this is a bug either in the manual or in PHP itself. So, no bug, no unexpected side-effects, just a logical result of applying the precedence rules strictly as advertised! Sounds good to me! I withdraw my aspersion. miguel -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Last time Append line to text file
The answer is:
$file_pointer = fopen('/public_html/emails.txt', a) or exit;
The || is a binary operation. You want or, the logical operation.
- Original Message -
From: Rodrigo [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; 'Miguel Cruz' [EMAIL PROTECTED]; 'John
Holmes' [EMAIL PROTECTED]
Sent: Sunday, April 28, 2002 10:55 PM
Subject: [PHP] Last time Append line to text file
Ok, but I'm trying the following code wich is basicaly the same Miguel
sent me and I still get the same message.
Please excuseme for being so repetitive but Í don't seem to see where is
the mistake, Sorry guys for the trouble.
?php
$file_pointer = fopen('/public_html/emails.txt', a) || exit;
$string_to_write = ($newemail) . \n;
fwrite($file_pointer, $string_to_write);
fclose($file_pointer);
?
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 4
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 6
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Re: [PHP] Last time Append line to text file
On Sun, 28 Apr 2002, Richard Emery wrote:
The answer is:
$file_pointer = fopen('/public_html/emails.txt', a) or exit;
The || is a binary operation. You want or, the logical operation.
Yeah, Perl habit.
But || is logical too (it's | that's binary), it just seems to result in
$file_pointer being recast from 'resource' to 'boolean' for some reason.
This side effect is not mentioned at
http://www.php.net/manual/en/language.operators.logical.php where it
imples that the only difference is precedence. I'd say this is a bug
either in the manual or in PHP itself.
miguel
- Original Message -
From: Rodrigo [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; 'Miguel Cruz' [EMAIL PROTECTED]; 'John
Holmes' [EMAIL PROTECTED]
Sent: Sunday, April 28, 2002 10:55 PM
Subject: [PHP] Last time Append line to text file
Ok, but I'm trying the following code wich is basicaly the same Miguel
sent me and I still get the same message.
Please excuseme for being so repetitive but Í don't seem to see where is
the mistake, Sorry guys for the trouble.
?php
$file_pointer = fopen('/public_html/emails.txt', a) || exit;
$string_to_write = ($newemail) . \n;
fwrite($file_pointer, $string_to_write);
fclose($file_pointer);
?
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 4
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 6
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RE: [PHP] Last time Append line to text file
or you could code it like this:
$file_pointer = fopen('/public_html/emails.txt', a)
if (!$file_pointer) exit;
-Original Message-
From: Miguel Cruz [mailto:[EMAIL PROTECTED]]
Sent: Monday, April 29, 2002 2:34 PM
To: Richard Emery
Cc: [EMAIL PROTECTED]
Subject: Re: [PHP] Last time Append line to text file
On Sun, 28 Apr 2002, Richard Emery wrote:
The answer is:
$file_pointer = fopen('/public_html/emails.txt', a) or exit;
The || is a binary operation. You want or, the logical operation.
Yeah, Perl habit.
But || is logical too (it's | that's binary), it just seems to result in
$file_pointer being recast from 'resource' to 'boolean' for some reason.
This side effect is not mentioned at
http://www.php.net/manual/en/language.operators.logical.php where it
imples that the only difference is precedence. I'd say this is a bug
either in the manual or in PHP itself.
miguel
- Original Message -
From: Rodrigo [EMAIL PROTECTED]
To: [EMAIL PROTECTED]; 'Miguel Cruz' [EMAIL PROTECTED]; 'John
Holmes' [EMAIL PROTECTED]
Sent: Sunday, April 28, 2002 10:55 PM
Subject: [PHP] Last time Append line to text file
Ok, but I'm trying the following code wich is basicaly the same Miguel
sent me and I still get the same message.
Please excuseme for being so repetitive but Í don't seem to see where is
the mistake, Sorry guys for the trouble.
?php
$file_pointer = fopen('/public_html/emails.txt', a) || exit;
$string_to_write = ($newemail) . \n;
fwrite($file_pointer, $string_to_write);
fclose($file_pointer);
?
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 4
Warning: Supplied argument is not a valid File-Handle resource in
/home/restricted/home/h4ck3r/public_html/write.php on line 6
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