PHP - Get length of digits in a number

Maybe:

$num = 245354;
$numlength = strlen((string)$num);

Accepted answer won't work with the big numbers. The better way to calculate the length of any number is to invoke floor(log10($num) + 1) with a check for 0.

$num = 12357;
echo $num !== 0 ? floor(log10($num) + 1) : 1; // prints 5

It has multiple advantages. It's faster, you don't do the casting of types, it works on big numbers, it works with different number systems like bin, hex, oct.

The equation does the logarithm with base 10 then makes the floor of it and adds 1.

This solution can work independently on the base, so if you want to calculate the length of binary or hex just change the base of the logarithm.

Working fiddle

The accepted solution presents a problem when evaluating negative numbers.

It works with a positive number:

$num = 245354;
$numlength = strlen((string)$num);
// Result: 6

But with a negative number, the (-) is added to the count:

$num = -245354;
$numlength = strlen((string)$num);
// Result: 7

Quick workaround:

$num = -245354;
$numlength = strlen((string)abs($num));
// Result: 6