| Re: counting the digits in a number, exponential format problem [message #171001 is a reply to message #171000] |
Tue, 14 December 2010 18:50   |
mhandersen
Messages: 5
Registered: December 2010
Karma:
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Junior Member |
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certainly at some level PHP must know the difference between a string
and a float, but you can't a define a variable yourself as such. all i
was saying is that strlen() takes a variable, type of that variable
cannot be declared. i understand that strlen is intended for use with
'strings' but it also works for floats up to E-4 after which it breaks
down... all i am wondering is why???
i tried the strlen(sprintf("0.03%f",$mynum)) suggestion (and several
iterations of it) but no luck. i am not sure where PHP makes the
decision on whether or not to convert to a decimal but that doesn't
appear to help.
@Jerry: i totally agree with you that PHP must convert a numeric value
passed to strlen() to a string at some point. what i do not understand
though is why it makes a difference whether the numeric is 1E-4 or
1E-5. it is like that single order of magnitude drastically changes
the logic/conversion process of the numeric to a string and causes the
answer to not, as you say, 'be what i want'.
it is just not consistent at all. imho a function like strlen() should
pick one way of handling a type of input and do it consistently, not
vary its approach depending on the size of a value passed to it...
especially when it is a weakly typed language.
it appears as though PHP might use something similar to the Linux
function strtod(3) to do its string to float conversions. however, the
man page:
http://linux.die.net/man/3/strtod
does not shed any light on my problem.
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