RE: [PHP-DB] Comparing Two Values
It is working now using === or !== Thanks a lot. Andre -- Andre Matos [EMAIL PROTECTED] -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 21, 2004 8:10 PM To: php-db@lists.php.net Cc: [EMAIL PROTECTED] Subject: Re: [PHP-DB] Comparing Two Values To be honest, I havn't had much use for it myself but I've done a lot of 'hack' projects that didn't need to be this specific. But as I understand, you might want to use the triple-equal sign to determine if they're exactly the same. Are you comparing... 2 with... 0002 (integer versus a string?) If so, the === should work I believe. It should compare variable types as well as values so it shouldn't convert 0002 to just 2 before doing the evaluation. Good luck! -TG = = = Original message = = = Hi List, I was comparing two values, a current value with a new value to build the UPDATE instruction and I faced this: Current value: 2 == new value: 0002 So, PHP is telling me that the current is equal to the new. Is this possible? Any idea to avoid this problem? Thanks for any help. Andre -- Andre Matos [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php ___ Sent by ePrompter, the premier email notification software. Free download at http://www.ePrompter.com. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Comparing Two Values
To be honest, I havn't had much use for it myself but I've done a lot of 'hack' projects that didn't need to be this specific. But as I understand, you might want to use the triple-equal sign to determine if they're exactly the same. Are you comparing... 2 with... 0002 (integer versus a string?) If so, the === should work I believe. It should compare variable types as well as values so it shouldn't convert 0002 to just 2 before doing the evaluation. Good luck! -TG = = = Original message = = = Hi List, I was comparing two values, a current value with a new value to build the UPDATE instruction and I faced this: Current value: 2 == new value: 0002 So, PHP is telling me that the current is equal to the new. Is this possible? Any idea to avoid this problem? Thanks for any help. Andre -- Andre Matos [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php ___ Sent by ePrompter, the premier email notification software. Free download at http://www.ePrompter.com. -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP-DB] Comparing Two Values
Andre Matos wrote:
Hi List,
I was comparing two values, a current value with a new value to build
the UPDATE instruction and I faced this:
Current value: 2 == new value: 0002
in short, assuming that both the variables are not integers (i.e.
2 is equal to 0002) you should use === if you want '002' to not equal '2'.
try the following lines of code:
var_dump(2 === 002);
var_dump('2' === '002');
var_dump('2' == '002');
var_dump(2 == 002);
var_dump(2 == '002');
amazing what a bit of experimentation can teach you
So, PHP is telling me that the current is equal to the new. Is this
possible? Any idea to avoid this problem?
this is not a problem, its the documented behaviour, actually it's the
foundation of what makes php so easy to use - namely automatic
typecasting and dynamic types (I am probably not explaining that too well).
read the manual to understand more:
http://nl.php.net/manual/en/language.operators.comparison.php
http://nl.php.net/manual/en/language.types.string.php#language.types.string.conversion
BTW: this is not a DB question. ;-)
Thanks for any help.
Andre
--
Andre Matos
[EMAIL PROTECTED]
--
PHP Database Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP-DB] Comparing Two Values
PHP implicitly casts the variables to be the same here...in this case the integer 2...if you want to force it to compare as text then you need to ensure that both variables are cast as text see here (http://ca3.php.net/language.types.type-juggling ) bastien From: Andre Matos [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: [PHP-DB] Comparing Two Values Date: Tue, 21 Dec 2004 18:21:26 -0500 Hi List, I was comparing two values, a current value with a new value to build the UPDATE instruction and I faced this: Current value: 2 == new value: 0002 So, PHP is telling me that the current is equal to the new. Is this possible? Any idea to avoid this problem? Thanks for any help. Andre -- Andre Matos [EMAIL PROTECTED] -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php -- PHP Database Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
