# How to get whole and decimal part of a number?

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How to get whole and decimal part of a number? – Here in this article, we will share some of the most common and frequently asked about PHP problem in programming with detailed answers and code samples. There’s nothing quite so frustrating as being faced with PHP errors and being unable to figure out what is preventing your website from functioning as it should like php and math . If you have an existing PHP-based website or application that is experiencing performance issues, let’s get thinking about How to get whole and decimal part of a number?.

Given, say, 1.25 – how do I get “1” and .”25″ parts of this number?

I need to check if the decimal part is .0, .25, .5, or .75.

Solution :

``````\$n = 1.25;
\$whole = floor(\$n);      // 1
\$fraction = \$n - \$whole; // .25
``````

Then compare against 1/4, 1/2, 3/4, etc.

In cases of negative numbers, use this:

``````function NumberBreakdown(\$number, \$returnUnsigned = false)
{
\$negative = 1;
if (\$number < 0)
{
\$negative = -1;
\$number *= -1;
}

if (\$returnUnsigned){
return array(
floor(\$number),
(\$number - floor(\$number))
);
}

return array(
floor(\$number) * \$negative,
(\$number - floor(\$number)) * \$negative
);
}
``````

The `\$returnUnsigned` stops it from making -1.25 in to -1 & -0.25

This code will split it up for you:

``````list(\$whole, \$decimal) = explode('.', \$your_number);
``````

where \$whole is the whole number and \$decimal will have the digits after the decimal point.

The floor() method doesn’t work for negative numbers. This works every time:

``````\$num = 5.7;
\$whole = (int) \$num;  // 5
\$frac  = \$num - \$whole;  // .7
``````

…also works for negatives (same code, different number):

``````\$num = -5.7;
\$whole = (int) \$num;  // -5
\$frac  = \$num - \$whole;  // -.7
``````

Just to be different ðŸ™‚

``````list(\$whole, \$decimal) = sscanf(1.5, '%d.%d');
``````

As an added benefit, it will only split where both sides consist of digits.

a short way (use floor and fmod)

``````\$var = "1.25";
\$whole = floor(\$var);     // 1
\$decimal = fmod(\$var, 1); //0.25
``````

then compare \$decimal to 0, .25, .5, or .75

Cast it as an int and subtract

``````\$integer = (int)\$your_number;
\$decimal = \$your_number - \$integer;
``````

Or just to get the decimal for comparison

``````\$decimal = \$your_number - (int)\$your_number
``````

There’s a fmod function too, that can be used :
fmod(\$my_var, 1)
will return the same result, but sometime with a small round error.

PHP 5.4+

``````\$n = 12.343;
intval(\$n); // 12
explode('.', number_format(\$n, 1))[1]; // 3
explode('.', number_format(\$n, 2))[1]; // 34
explode('.', number_format(\$n, 3))[1]; // 343
explode('.', number_format(\$n, 4))[1]; // 3430
``````

This is the way which I use:

``````\$float = 4.3;

\$dec = ltrim((\$float - floor(\$float)),"0."); // result .3
``````

Just a new simple solution, for those of you who want to get the Integer part and Decimal part splitted as two integer separated values:

5.25 -> Int part: 5; Decimal part: 25

``````\$num = 5.25;
\$int_part = intval(\$num);
\$dec_part = \$num * 100 % 100;
``````

This way is not involving string based functions, and is preventing accuracy problems which may arise in other math operations (such as having 0.49999999999999 instead of 0.5).

Haven’t tested thoroughly with extreme values, but it works fine for me for price calculations.

But, watch out! Now from -5.25 you get: Integer part: -5; Decimal part: -25

In case you want to get always positive numbers, simply add `abs()` before the calculations:

``````\$num = -5.25;
\$num = abs(\$num);
\$int_part = intval(\$num);
\$dec_part = \$num * 100 % 100;
``````

Finally, bonus snippet for printing prices with 2 decimals:

``````\$message = sprintf("Your price: %d.%02d Eur", \$int_part, \$dec_part);
``````

…so that you avoid getting 5.5 instead of 5.05. ðŸ˜‰

``````function extractFraction (\$value)
{
\$fraction   = \$value - floor (\$value);
if (\$value < 0)
{
\$fraction *= -1;
}

return \$fraction;
}
``````

I was having a hard time finding a way to actually separate the dollar amount and the amount after the decimal. I think I figured it out mostly and thought to share if any of yall were having trouble

So basically…

if price is 1234.44… whole would be 1234 and decimal would be 44 or

if price is 1234.01… whole would be 1234 and decimal would be 01 or

if price is 1234.10… whole would be 1234 and decimal would be 10

and so forth

``````\$price = 1234.44;

\$whole = intval(\$price); // 1234
\$decimal1 = \$price - \$whole; // 0.44000000000005 uh oh! that's why it needs... (see next line)
\$decimal2 = round(\$decimal1, 2); // 0.44 this will round off the excess numbers
\$decimal = substr(\$decimal2, 2); // 44 this removed the first 2 characters

if (\$decimal == 1) { \$decimal = 10; } // Michel's warning is correct...
if (\$decimal == 2) { \$decimal = 20; } // if the price is 1234.10... the decimal will be 1...
if (\$decimal == 3) { \$decimal = 30; } // so make sure to add these rules too
if (\$decimal == 4) { \$decimal = 40; }
if (\$decimal == 5) { \$decimal = 50; }
if (\$decimal == 6) { \$decimal = 60; }
if (\$decimal == 7) { \$decimal = 70; }
if (\$decimal == 8) { \$decimal = 80; }
if (\$decimal == 9) { \$decimal = 90; }

echo 'The dollar amount is ' . \$whole . ' and the decimal amount is ' . \$decimal;
``````

``````\$x = 1.24

\$result = \$x - floor(\$x);

echo \$result; // .24
``````

If you can count on it always having 2 decimal places, you can just use a string operation:

``````\$decimal = 1.25;
substr(\$decimal,-2);  // returns "25" as a string
``````

No idea of performance but for my simple case this was much better…

To prevent the extra float decimal (i.e. 50.85 – 50 give 0.850000000852), in my case I just need 2 decimals for money cents.

``````\$n = 50.85;
\$whole = intval(\$n);
\$fraction = \$n * 100 % 100;
``````

Try it this way… it’s easier like this

``````\$var = "0.98";

\$decimal = strrchr(\$var,".");

\$whole_no = \$var-\$decimal;

echo \$whole_no;

echo str_replace(".", "", \$decimal);
``````

You could also use something like this:

``````preg_match("/([0-9]+).([0-9]+)/", \$number, \$matches);
``````

If you want the two halves to be explicitly type cast, then `sscanf()` is a great call.

Code: (Demo)

``````var_dump(sscanf(1.25, '%d%f'));
``````

Output:

``````array(2) {
[0]=>
int(1)
[1]=>
float(0.25)
}
``````

Or you can assign the two variables individually:

``````sscanf(1.25, '%d%f', \$int, \$float);
var_dump(\$int);
var_dump(\$float);
``````

Casting the decimal portion as a float is particularly useful when, say, converting decimal expression of hours to hours and minutes. (Demo)

``````\$decimalTimes = [
6,
7.2,
8.78,
];

foreach (\$decimalTimes as \$decimalTime) {
sscanf(\$decimalTime, '%d%f', \$hours, \$minutes);
printf('%dh%02dm', \$hours, round(\$minutes * 60));
echo "n";
}
``````

Output:

``````6h00m
7h12m
8h47m  // if round() was not used, this would be 8h46m
``````

Not seen a simple modulus here…

``````\$number         = 1.25;
\$wholeAsFloat   = floor(\$number);   // 1.00
\$wholeAsInt     = intval(\$number);  // 1
\$decimal        = \$number % 1;      // 0.25
``````

In this case getting both `\$wholeAs?` and `\$decimal` don’t depend on the other. (You can just take 1 of the 3 outputs independently.) I’ve shown `\$wholeAsFloat` and `\$wholeAsInt` because `floor()` returns a float type number even though the number it returns will always be whole. (This is important if you’re passing the result into a type-hinted function parameter.)

I wanted this to split a floating point number of hours/minutes, e.g. 96.25, into hours and minutes separately for a DateInterval instance as 96 hours 15 minutes. I did this as follows:

``````\$interval = new DateInterval(sprintf("PT%dH%dM", intval(\$hours), ((\$hours % 1) * 60)));
``````

I didn’t care about seconds in my case.

``````val = -3.1234

fraction = abs(val - as.integer(val) )
``````