[RESOLVED] How can i count decimal places in a number in php

[Watcher32]

i have been looking around for a function in php or a solution that will simply allow me to count to number of decimal places in a number.

example

0.477 > 3 decimal places

18.09090 > 5 decimal places

can anyone help in suggesting a way i can simply count the decimal places in a number like this
, eqvalent to this type of javascript code

$p_file = "0.477";
$v_fileLength = $p_file.length; // --> 3

thanks in advance

[dagon]

you could explode() on the . and then use strlen() but i suspect there is a better way.

[Watcher32]

yeah thats what i have done

$v_fileFloat = "0.87687";
$v_fileFloatb = explode(".", $v_fileFloat);

echo $v_fileFloatb[0]."<br>".$v_fileFloatb[1];

$v_fileLength = strlen($v_fileFloatb[0]);
$v_fileLength2 = strlen($v_fileFloatb[1]);

this is probably the easist way to go

thanks for the help

[dagon]

there should be a math way of doing it, but my math skills suck, hopeful some one will enlighten us.

[Weedpacket]

They are strings? Not doubles?
strlen($string) - strcspn($string, '.') - 1;

If they're doubles you'd probably just get the display precision because floating-point arithmetic doesn't really do "decimal places".

[nrg_alpha]

Alternatively, perhaps:

$p_file = "0.477";
echo strlen(strrchr($p_file, '.')) -1; // 3

?

[mosymuis]

Old topic, I know, but for the Google'rs:

function countDecimals($fNumber)
{
	$fNumber = floatval($fNumber);

for ( $iDecimals = 0; $fNumber != round($fNumber, $iDecimals); $iDecimals++ );

return $iDecimals;
}