The `vprintf()` function in PHP is similar to `printf()`, but it accepts an array of arguments rather than a variable number of arguments. This is particularly useful when you have your values in an array format.PHP 8.PHP 8.1,PHP 8.2,PHP 8.3,and PHP 8.4.

Basic Syntax<?phpvprintf(string $format, array $values): int?>

Example Usage

<?php// Example 1: Basic usage$format = "There are %d monkeys in the %s\n";$args = [5, "tree"];vprintf($format, $args); // Output: There are 5 monkeys in the tree// Example 2: With different specifiers$userData = ["John Doe", 34, 45000.50];vprintf("Name: %s, Age: %d, Salary: $%.2f\n", $userData);// Output: Name: John Doe, Age: 34, Salary: $45000.50// Example 3: With named arguments (PHP 8.2+)$params = ['name' => 'Alice', 'score' => 95.5];vprintf("Player %(name)s scored %(score).1f points\n", $params);// Output: Player Alice scored 95.5 points?>

Practical Use Case

<?phpfunction logFormattedMessage(string $format, array $context) {$length = vprintf("[%s] " . $format, array_merge([date('Y-m-d H:i:s')], $context));return $length;}logFormattedMessage("User %s performed action %s", ["john_doe", "login"]);// Output: [2023-11-15 14:30:00] User john_doe performed action login

This function prepends a timestamp to formatted log messages while using `vprintf()` to handle the variable context.