|
|
Posted by Marcus on 10/22/00 11:20
Michael Winter wrote:
> On 02/07/2005 23:34, Marcus wrote:
>
> [snip]
>
>> if anything, I would have thought testing if ['default'] == 1 would be
>> a boolean true since the variable exists and is not NULL, but testing
>> if ['default'] == 1 returns FALSE.
>
>
> This is due to implicit type conversion. When you use the equality (==)
> rather than strict equality (===) and compare two different types, the
> values are converted into something that can be compared in some
> meaningful way.
>
> If you compare a string to a number, an attempt is made to convert that
> string to a number first. If the string starts with valid number data,
> then that will be the used value, otherwise the comparison will be
> against zero (0).
>
> The string 'default' doesn't have anything resembling a number at its
> start, so it will be converted to zero. You then perform a comparison
> against literal zero, hence the expression evaluates to true.
>
> See the type comparison page[1], as well as the section on converting
> strings to numbers[2], in the manual.
>
> Mike
>
>
> [1] <URL:http://www.php.net/manual/en/types.comparisons.php>
> [2]
> <URL:http://www.php.net/manual/en/language.types.string.php#language.types.string.conversion>
>
>
Thank you both for the links and info, I enclosed my 0 in quotes and
everything now works.
Navigation:
[Reply to this message]
|