php檔案系統函數問題！

php

我要在1.php上怎麼寫才能在log.txt上$msg裡輸出的是person.php的結果，就是把那個('調入檔案成功')改為那個person.php的結果
//1.php
function writeLog($msg){
$logFile = 'log.txt';
date_default_timezone_set('Asia/Chongqing');
$msg = date('Y-m-d H:i:s').' >>> '.$msg."\r\n";
file_put_contents($logFile,$msg,FILE_APPEND );
require_once('person.php');
}
writeLog('調入檔案成功');
?>

//person.php
class Person{
public $name;
public $age;
function construct($name,$age){
$this->name = $name;
$this->age = $age;
}
function show() {
echo "my name is ".$this->name." ";

}
}
$sxd=new Person();
$sxd->name="sxd";
$sxd->age=22;
$sxd->show();
echo "age is ".$sxd->age;
?>

