number_format() - string

This function accepts either one, two, or four parameters (not three):

Parameters : 
 number - The number being formatted. 
 decimals - Sets the number of decimal points. 
 dec_point - Sets the separator for the decimal point. 
 thousands_sep - Sets the thousands separator. 

Syntax

string number_format
    ( float $number
   [, int $decimals = 0
  ] )

Example

For instance, French notation usually use two decimals,
     comma (',') as decimal separator, and space (' ') as
     thousand separator. This is achieved with this line :

Output / Return Value

Limitations

Alternatives / See Also

Reference