note 117212 added to language.types.float
| From: | luizvid at gmail dot com | Date: | Mon, 04 May 2015 00:06:38 +0000 |
| Subject: | note 117212 added to language.types.float | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-202419@lists.php.net to get a copy of this message | ||
An effective way to compare two real numbers (including floating point numbers) with high accuracy
and still be able to set precision is using the BC Math function bccomp();
For instance:
<?php
$a = 1.23456789;
$b = 1.23456780;
$precision = 5;
if(bccomp($a, $b, $precision) === 0 ) {
echo "true";
} // true
?>
<?php
$a = sprintf('%.17f', 0.1+0.2);
$b = 0.3;
if(bccomp($a, $b, 17) !== 0 ) {
echo "FALSE";
} // FALSE
?>
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Server IP: 72.52.91.14
Probable Submitter: 187.21.248.94
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Manual Page -- http://php.net/manual/en/language.types.float.php
Edit -- https://master.php.net/note/edit/117212
Del: integrated -- https://master.php.net/note/delete/117212/integrated
Del: useless -- https://master.php.net/note/delete/117212/useless
Del: bad code -- https://master.php.net/note/delete/117212/bad+code
Del: spam -- https://master.php.net/note/delete/117212/spam
Del: non-english -- https://master.php.net/note/delete/117212/non-english
Del: in docs -- https://master.php.net/note/delete/117212/in+docs
Del: other reasons-- https://master.php.net/note/delete/117212
Reject -- https://master.php.net/note/reject/117212
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