Hello.
In looking at numer vs string comparison, I think I've found an oddity.
You can successfully compare hex strings ...
var_dump(255 == '0xff');
but not octal strings ...
var_dump(63 == '077');
Is this a bug (lack of octal support) or an unexpected feature (hex support)?
Neither formats are documented in [1].
Regards,
Richard.
[1] http://docs.php.net/manual/en/language.types.string.php#language.types.string.conversion
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling
I think it's not an but!
you must read carefuly about "Single quoted" and "Double quoted"
2010/1/14 Richard Quadling rquadling@googlemail.com:
Hello.
In looking at numer vs string comparison, I think I've found an oddity.
You can successfully compare hex strings ...
var_dump(255 == '0xff');
but not octal strings ...
var_dump(63 == '077');
Is this a bug (lack of octal support) or an unexpected feature (hex support)?
Neither formats are documented in [1].
Regards,
Richard.
[1] http://docs.php.net/manual/en/language.types.string.php#language.types.string.conversion
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling
2010/1/13 hack988 hack988 hack988@dev.htwap.com:
I think it's not an but!
you must read carefuly about "Single quoted" and "Double quoted"2010/1/14 Richard Quadling rquadling@googlemail.com:
Hello.
In looking at numer vs string comparison, I think I've found an oddity.
You can successfully compare hex strings ...
var_dump(255 == '0xff');
but not octal strings ...
var_dump(63 == '077');
Is this a bug (lack of octal support) or an unexpected feature (hex support)?
Neither formats are documented in [1].
Regards,
Richard.
[1] http://docs.php.net/manual/en/language.types.string.php#language.types.string.conversion
Not sure you've got what I'm saying ...
<?php
var_dump(255 == '0xff');
var_dump(63 == '077');
var_dump(255 == "0xff");
var_dump(63 == "077");
?>
outputs ...
bool(true)
bool(false)
bool(true)
bool(false)
Single/double quotes don't come into the issue.
--
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling
Richard Quadling wrote:
Hello.
In looking at numer vs string comparison, I think I've found an oddity.
You can successfully compare hex strings ...
var_dump(255 == '0xff');
but not octal strings ...
var_dump(63 == '077');
Is this a bug (lack of octal support) or an unexpected feature (hex support)?
We don't have octal strings in PHP. Only native octal.
eg.
var_dump(63 == 077);
Why? Mostly because octal strings is more likely to cause incorrect
behaviour than both regular numeric strings and hex strings.
-Rasmus
2010/1/13 Rasmus Lerdorf rasmus@lerdorf.com:
Richard Quadling wrote:
Hello.
In looking at numer vs string comparison, I think I've found an oddity.
You can successfully compare hex strings ...
var_dump(255 == '0xff');
but not octal strings ...
var_dump(63 == '077');
Is this a bug (lack of octal support) or an unexpected feature (hex support)?
We don't have octal strings in PHP. Only native octal.
eg.
var_dump(63 == 077);Why? Mostly because octal strings is more likely to cause incorrect
behaviour than both regular numeric strings and hex strings.-Rasmus
Thank you.
Should [1] be updated to include hex strings and a note about octal strings?
Richard.
[1] http://docs.php.net/manual/en/language.types.string.php#language.types.string.conversion
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling