format a number keeping its sign in php

Question

Is there a way to format in PHP a number always keeping its sign (+ or -)?

In .NET this will be something like:

string myString = number.ToString("+#;#");

Answer 1

printf("%+d", $number)

Answer 2

Use sprintf:

$myString = sprintf("%+f", number);

Answer 3

   $myString = sprintf("%+d", 25);