fprintf in PHP

The PHP fprintf() function is utilized to writes a formatted string to a output stream.

Syntax:

fprintf(stream,format,arg1,arg2,arg++)

Parameters Description: 

stream : Required. Defines where to write the string.
format : Required. Defines the string and how to format the variables in it.
Possible format values:

• %% - Returns a percent sign
• %b - Binary number
• %c - The character according to the ASCII value
• %d - Signed decimal number
• %e - Scientific notation (e.g. 1.2e+2)
• %u - Unsigned decimal number
• %f - Floating-point number (local settings aware)
• %F - Floating-point number (not local settings aware)
• %o - Octal number
• %s - String
• %x - Hexadecimal number (lowercase letters)
• %X - Hexadecimal number (uppercase letters)

arg1 : Required. The argument to be added as the first %-sign.
arg2 : Optional. The argument to be added at the second %-sign.
arg++ : Optional.  The argument to be added at the third, fourth, etc. %-sign.
Note: If there are more % signs than arguments, you must use placeholders.
Tip: Related functions: printf(), sprintf(), vfprintf(), vprintf(), and vsprintf().

Example:

<?php 
$input_str = "Good";
$input_number = 330;
$file_name = fopen("test.txt","w");
echo fprintf($file_name,"%s Morning. It is day number %u",$input_str,$input_number);
?>

O/P:

34

The following text will be written to the file "test.txt":

Good Morning. It is day number 330