The fprintf() function is used to write a formatted string to a stream
Syntax
fprintf (stream, format, argument1, argument2, ... )
Parameters
stream − Where to write/output the string
format − Specifies the string and how to format the variables in it.
The following are the possible format values −
%% − Returns a percent sign
%b − Binary number
%c − The character according to the ASCII value
%d − Signed decimal number (negative, zero or positive)
%e − Scientific notation using a lowercase (e.g. 1.2e+2)
%E − Scientific notation using a uppercase (e.g. 1.2E+2)
%u − Unsigned decimal number (equal to or greather than zero)
%f − Floating-point number (local settings aware)
%F − Floating-point number (not local settings aware)
%g − shorter of %e and %f
%G − shorter of %E and %f
%o − Octal number
%s − String
%x − Hexadecimal number (lowercase letters)
%X − Hexadecimal number (uppercase letters)
argument1 − The argument to be inserted at the first %-sign in the format string.
argument2 − The argument to be inserted at the second %-sign in the format string.
Return
The fprintf() function returns the length of the string written.
Example
The following is an example −
<?php
$input = 123; $file = fopen("sample.txt","r");
fprintf($file,"%f",$input);
?>Output
123.000000