fprintf() function in PHP

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 −

 Live Demo

<?php
$input = 123; $file = fopen("sample.txt","r");
fprintf($file,"%f",$input);
?>

Output

123.000000

George John

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Updated on: 24-Jun-2020

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