How do I truncate a decimal in PHP?

php truncate

23,785

Solution 1

Yes intval

intval(1234.567);
intval(-1234.567);

Solution 2

Truncate floats with specific precision:

echo bcdiv(2.56789, 1, 1);  // 2.5
echo bcdiv(2.56789, 1, 3);  // 2.567
echo bcdiv(-2.56789, 1, 1); // -2.5
echo bcdiv(-2.56789, 1, 3); // -2.567

This method solve the problem with round() function.

Solution 3

Also you can use typecasting (no need to use functions),

(int) 1234.567; //  1234
(int) -1234.567; // -1234

http://php.net/manual/en/language.types.type-juggling.php

You can see the difference between intval and (int) typecasting from here.

Solution 4

another hack is using prefix ~~ :

echo ~~1234.567; // 1234
echo ~~-1234.567; // 1234

it's simpler and faster

Tilde ~ is bitwise NOT operator in PHP and Javascript

Double tilde(~) is a quick way to cast variable as integer, where it is called 'two tildes' to indicate a form of double negation.

It removes everything after the decimal point because the bitwise operators implicitly convert their operands to signed 32-bit integers. This works whether the operands are (floating-point) numbers or strings, and the result is a number

reference:

Solution 5

you can use intval(number); but if your number bigger than 2147483648 (and your machine/os is x64) all bigs will be truncated to 2147483648. So you can use

if($number < 0 )
$res = round($number);
else
$res = floor($number); 

echo $res;

View more solutions

23,785

Author by

chrislondon

Updated on July 07, 2021

Comments

chrislondon almost 3 years
I know of the PHP function floor() but that doesn't work how I want it to in negative numbers.

This is how floor works
```
floor( 1234.567); //  1234
floor(-1234.567); // -1235
```
This is what I WANT
```
truncate( 1234.567); //  1234
truncate(-1234.567); // -1234
```
Is there a PHP function that will return -1234?

I know I could do this but I'm hoping for a single built-in function
```
$num = -1234.567;
echo $num >= 0 ? floor($num) : ceil($num);
```
chrislondon almost 11 years

I like this because intval is indicative of what I'm really trying to accomplish.
Rich Bradshaw almost 11 years

That's not what he wants though. Both lines should be 1234 in his example.
Nikhil Mohan almost 11 years

@Rich Bradshaw Sry.. it's my mistake. I just copied the first code block and forgot to edit the commented part. Live demo here codepad.org/7gBgAHBK
chrislondon almost 11 years

I wish I could mark two answers as correct. I like both intval() and (int)
Nikhil Mohan almost 11 years

@chrislondon That's ok :). But you should check this wiki.phpbb.com/Best_Practices:PHP#Typecasting
Rich Bradshaw almost 11 years

I'd typically use these functions rather than intval.
vr_driver almost 4 years

This is good if you have the library to open, otherwise you'll get a fatal error: "Call to undefined function bcdiv()"