php中的简单正则表达式，格式化十进制数

Question

I need to convert numbers to have .00 after them, but only if the number is an integer, or it has just 1 number after the decimal point, like so:

1.4 = 1.40
45 = 45.00
34.77 = 34.77

What reg exp to use for this simple case?

Answer 1

number_format($number, 2, '.', '');

Read more at PHP.net. You don't need to determine if a number is an integer or not -- as long as it's a number, it will be formatted to two decimal places.

If you'd like the thousands separator, change the last parameter to ','.