ID: 20708
Comment by: milos at mcservices dot com
Reported By: wb at sapo dot pt
Status: Bogus
Bug Type: Scripting Engine problem
Operating System: linux 2.2.20, linux 2.4.19
PHP Version: 4.2.3
New Comment:
This should be BOLDED in RED in documentation!
Previous Comments:
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[2002-11-28 18:34:32] wb at sapo dot pt
thank you for very fast information.
type juggling is a great feature but really hard to learn. now i
learned that it casts my string to numeric for the comparison with an
integer - my coding would have needed the integer casted to a string.
sorry for bothering you. i will go and look for more information about
precedence of type casting in comparisons if it is that way it works.
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[2002-11-28 18:13:07] [EMAIL PROTECTED]
The numerical value of 'foo' is 0. If you want to compare both value
*and* type, use ===
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[2002-11-28 18:11:16] wb at sapo dot pt
another summary
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[2002-11-28 18:02:32] wb at sapo dot pt
sorry, im really not sure if this is a kind of bug or if i'm getting
something wrong: the two lines
echo 'foo'==0 ? 'is true ' : 'is false ';
if('bar'==0) echo 'is true '; else echo 'is false ';
will output:
is true is true
i dont understand why 'foo'==0 returns true.
the way i understand the manual, php should consider 'foo' a nonempty
string and 0 a zero integer. even if it would do a boolean comparison,
according to the manual 'foo' should be juggled to true and 0 should be
juggled to false. how can 'foo'==0 return true? have i missed
something?
i hope i do not resubmit a known issue, i tried some queries but i
really didnt know how to lookup this issue.
this happens with variables as well. i ran into this problem in my
programming when comparing array keys that could be numeric or string.
a 0 array key compared against any nonempty string array key always
returned true. it took me a while to find out that's why my program
didnīt work the way i thought it should.
i hope this is not something that happens only to me, but i have tested
the two lines on three different boxes before writing to you.
my configure line:
./configure' '--with-mysql=/usr/local/mysql'
'--with-apache=../apache_1.3.26' '--enable-ftp'
'--with-zlib-dir=/usr/lib'
Best regards,
wolfgang
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