The vfprintf() function is an inbuilt function in PHP that is used to write formatted information to a stream, such as a file or the output screen.
Syntax:
vfprintf(resource $stream, string $format, array $values):
Parameters: This function accepts three parameters that are described below.
- $stream: This parameter tells you where you write the string. It could be a file or a standard output like a screen.
- $format: This is a template that shows how you want to arrange your data. It contains placeholders (like
%d,%s, etc.) that represent where your actual data will go. - $values: This array holds the actual data that will be inserted into the placeholders of the format string.
Return Values: The vfprintf() function returns the count of the character written to the screen. It will return an integer type
Program 1: The following program demonstrates the vfprintf() function.
PHP
<?php   $stream = fopen('./output.txt', 'w'); $values = [10, "Ram"]; $format = "Number: %d, Name: %s\n";      $result = vfprintf($stream, $format, $values);      fclose($stream);      if ($result >= 0) {     echo "Successfully wrote $result characters to the file."; } else {     echo "An error occurred while writing to the file."; }     ?> |
Output
Successfully wrote 22 characters to the file.
Program 2: The following program demonstrates the vfprintf() function.
PHP
<?php   $values = ["Hello", "GPT-3.5", 2023]; $format = "Hello Geeks for Geeks .\n";       $result = vfprintf($stream, $format, $values);       if ($result >= 0) {     echo "Successfully wrote $result characters to the screen."; } else {     echo "An error occurred while writing to the screen."; }       fclose($stream);   ?> |
Output
Hello Geeks for Geeks . Successfully wrote 24 characters to the screen.
Reference: https://www.php.net/manual/en/function.vfprintf.php
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