Number formatting in PHP

OK while coding numbers are almost always there. Bit it stat, some calculation, rate finding … a lot is on numbers.
Saying so, we might want to beautify our numbers on displaying or storing or making them an input for another usage or we just want it.
PHP has the function number_format() for this usage: this accepts up to 4 parameters where we can supply either one, two or four of them.

lets have this number 456234.3451678 as a result of some calculation.
$number = 456234.3451678;
Taking the integral part:
we can do this in different methods
1. casting it to integer:

(int)$number;

2. using built-in function:

number_format($number); // output -> 456,234

3. using regex:

 
        $pattern="/.d*/";
        $number = preg_replace($pattern, '', $number);

After this operation, we might need to cast it back to the number for type safety cases.
Also we can use str_replace

Limiting number of decimals after decimal point
This also can be achieved in different ways:
1. Using function:

number_format($number, 2); //takes the two digits next to decimal point

2. Using regex:

preg_match('/(d+(.?d{0,2})?)/', $number, $matches); // here matches[0] would contain the required value

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