number_format Format a number with grouped thousands stringnumber_format floatnumber intdecimals stringnumber_format floatnumber intdecimals stringdec_point stringthousands_sep number_format returns a formatted version of number. This function accepts either one, two or four parameters (not three): If only one parameter is given, number will be formatted without decimals, but with a comma (",") between every group of thousands. If two parameters are given, number will be formatted with decimals decimals with a dot (".") in front, and a comma (",") between every group of thousands. If all four parameters are given, number will be formatted with decimals decimals, dec_point instead of a dot (".") before the decimals and thousands_sep instead of a comma (",") between every group of thousands. Only the first character of thousands_sep is used. For example, if you use foo as thousands_sep on the number 1000, number_format will return 1f000. For instance, French notation usually use two decimals, comma (',') as decimal separator, and space (' ') as thousand separator. This is achieved with this line : ]]> See also: sprintf, printf and sscanf.