W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<body>

<?php
$num1 = 123456789;
$num2 = -123456789;
$char = 50; // The ASCII Character 50 is 2

// Note: The format value "%%" returns a percent sign
echo sprintf("%%b = %b",$num1)." "; // Binary number
echo sprintf("%%c = %c",$char)." "; // The ASCII Character
echo sprintf("%%d = %d",$num1)." "; // Signed decimal number
echo sprintf("%%d = %d",$num2)." "; // Signed decimal number
echo sprintf("%%e = %e",$num1)." "; // Scientific notation (lowercase)
echo sprintf("%%E = %E",$num1)." "; // Scientific notation (uppercase)
echo sprintf("%%u = %u",$num1)." "; // Unsigned decimal number (positive)
echo sprintf("%%u = %u",$num2)." "; // Unsigned decimal number (negative)
echo sprintf("%%f = %f",$num1)." "; // Floating-point number (ls aware)
echo sprintf("%%F = %F",$num1)." "; // Floating-point number (not aware) 
echo sprintf("%%g = %g",$num1)." "; // Shorter of %e and %f
echo sprintf("%%G = %G",$num1)." "; // Shorter of %E and %f
echo sprintf("%%o = %o",$num1)." "; // Octal number
echo sprintf("%%s = %s",$num1)." "; // String
echo sprintf("%%x = %x",$num1)." "; // Hexadecimal number (lowercase)
echo sprintf("%%X = %X",$num1)." "; // Hexadecimal number (uppercase)
echo sprintf("%%+d = %+d",$num1)." "; // Sign specifier (positive)
echo sprintf("%%+d = %+d",$num2)." "; // Sign specifier (negative)
?>

</body>
</html>

%b = 111010110111100110100010101
%c = 2
%d = 123456789
%d = -123456789
%e = 1.234568e+8
%E = 1.234568E+8
%u = 123456789
%u = 18446744073586094827
%f = 123456789.000000
%F = 123456789.000000
%g = 1.23457e+8
%G = 1.23457E+8
%o = 726746425
%s = 123456789
%x = 75bcd15
%X = 75BCD15
%+d = +123456789
%+d = -123456789