PHP中如何实现函数日志？

<?php
class Logger {
    private $logFile;

    public function __construct($logFile) {
        $this->logFile = $logFile;
    }

    public function log($message) {
        $timestamp = date('Y-m-d H:i:s');
        $logEntry = "[$timestamp] $message\n";
        file_put_contents($this->logFile, $logEntry, FILE_APPEND);
    }
}

class MyClass {
    private $logger;

    public function __construct(Logger $logger) {
        $this->logger = $logger;
    }

    public function __call($method, $args) {
        $this->logger->log("Calling method: $method with arguments: " . json_encode($args));
        if (method_exists($this, $method)) {
            return call_user_func_array([$this, $method], $args);
        } else {
            throw new BadMethodCallException("Method $method does not exist.");
        }
    }

    public function doSomething($param) {
        // 实际的函数逻辑
        return "Doing something with $param";
    }
}

$logger = new Logger('log.txt');
$obj = new MyClass($logger);

$result = $obj->doSomething('test');
echo $result; // 输出: Doing something with test
?>