[SR-Users] how can string "0" be equal to int 0?
Iñaki Baz Castillo
ibc at aliax.net
Fri Oct 15 18:03:38 CEST 2010
2010/10/15 Iñaki Baz Castillo <ibc at aliax.net>:
> 1) Never do implicit type conversion. This is, a string is NEVER equal
> to an integer:
>
> if "0" == 0 => false
> if "" == 0 => false
> if "asdasd" == 0 => false
>
>
> 2) An integer is NEVER equal to a string:
>
> if 0 == "0" => false
> if 0 == "" => false
> if 0 == "asdasd" => false
>
>
> 3) Integer 0 is not equal to NULL:
>
> if 0 == NULL => false
>
>
> 4) Empty string is not equal to NULL:
>
> if "" == NULL => false
>
>
> 5) Integer 0 is true:
>
> if 0 => true
>
>
> 6) Empty string is true:
>
> if "" => true
These simple rules avoid stupid problems (as they occur in PHP):
http://www.otton.org/2008/08/06/stupid-php-tricks-true-false-comparison/
--
Iñaki Baz Castillo
<ibc at aliax.net>
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