Hi,
From http://www.php.net/manual/en/language.types.float.php (second comment in
that page, from "kjohnson at zootweb dot com"):
"PHP switches from the standard decimal notation to exponential notation for
certain "special" floats. You can see a partial list of
such "special" values with this:"
Then he goes on about it and finishes with:
" I have to be honest: this is one of the strangest things I have seen in any
language in over 20 years of coding, and it is a
colossal pain to work around."
I have the same problem. I have a big number I have to represent, it's usually
"1" followed by 10 "zeros", the biggest value I'll
have for it is 19999999999, never more than this. I only make one operation
with it, (+), most of the time I need that number as a
string, and never need it's float representation, only the absolute value (in
fact, it's never going to have a fractional part). I
cannot use integers because it's bigger than the integer range.
If it goes to it's exponential representation, breaks my code. Users are
identified by that number. I wrote a small function, but
cannot be sure if it's going to work (report error when the exponential
notation is used by php), mostly because on my tests, I
can't precise when and to which of these numbers php chooses to use the
exponential notation:
--- code
function checkFloat($float_var) {
$ar_empty = "";
$string_var = (string)$float_var;
$pattern = '/[0-9]|\./'; // From zero to nine and "dots"
$match_found = preg_match_all($pattern, $string_var, $ar_empty);
unset($ar_empty);
if ($match_found != strlen($string_var)) {
return false;
} else {
return true;
}
}
--- code
So, any suggestions/thoughts?
Is there a way to prevent php from using the exponential notation for a float?
thanks
=
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