PHP typecasting float->int

Question

Given this PHP code:

// total is 71.24 (float)
$value = $total * 100;
var_dump($value);
$valuecast = (int)$value;
var_dump($valuecast);
settype($value, 'int');
var_dump($value);

var_dump($value) gives float(7124)

var_dump($valuecast) gives int(7123)

var_dump($value) after settype gives int(7123)

How can I get the correct type conversion?

Gordon · Accepted Answer · 2010-01-13 09:08:44Z

4

From PHP Manual on TypeCasting Float to Integer

Warning

Never cast an unknown fraction to integer, as this can sometimes lead to unexpected results.
<?php
    echo (int) ( (0.1+0.7) * 10 ); // echoes 7!
?>
See also the warning about float precision.

answered Jan 13, 2010 at 9:08

Gordon

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1 Comment

Mark Lopez Over a year ago

The de3 link doesn't seem to be online anymore. So try php.net/manual/en/language.types.float.php#warn.float-precision

K Prime · Accepted Answer · 2010-01-13 09:06:44Z

2

For float to int, I'd suggest round. This is to cater to IEEE float imprecision.

answered Jan 13, 2010 at 9:06

K Prime

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