<?php

class TaskQueue {

private $queue = [];

private $logFile = 'task_queue.log';

public function enqueue(string $date, callable $task): void {

// Add task to the queue with date

$this->queue[] = ['date' => $date, 'task' => $task];

}

public function process(): void {

$this->log('Starting task processing...');

$this->queue = $this->queue ?: []; // Ensure queue is not null

foreach ($this->queue as $taskData) {

$date = $taskData['date'];

$task = $taskData['task'];

try {

$task($date); // Execute the task

$this->log("Task executed successfully for date: $date");

} catch (Exception $e) {

$this->log("Error executing task for date: $date - " . $e->getMessage());

}

}

$this->log('Task processing completed.');

}

private function log(string $message): void {

$timestamp = date('Y-m-d H:i:s');

$logEntry = "[$timestamp] $message\n";

file_put_contents($this->logFile, $logEntry, FILE_APPEND);

}

}

//Example usage:

$queue = new TaskQueue();

//Define some tasks

function task1(string $date): void {

echo "Executing task 1 for date: $date\n";

}

function task2(string $date): void {

echo "Executing task 2 for date: $date\n";

throw new Exception("Simulated error in task 2");

}

//Enqueue tasks

$queue->enqueue('2024-10-26', 'task1');

$queue->enqueue('2024-10-27', 'task2');

$queue->enqueue('2024-10-26', 'task1');

//Process the queue

$queue->process();

?>