php中数组写入文件方法

var_export($times,true);后面不加true不能写入文件哟
$fp = fopen('aa.txt','w+');
fwrite($fp,var_export($times,true));
fclose($fp);

if(isset($_POST['sub'])){    
 $cfg = array('contact'=>$_POST['contact']); //把数据存入数组   
 file_put_contents('./data/contact.cache',serialize($cfg));
        //把数组序列化之后，写到contact.cache里，
 $this->redirect('other/contact');//跳转
 }
 else{    
 $fp = fopen('./data/contact.cache','r');//读
 $cf = unserialize(fread($fp,filesize('./data/contact.cache')));//反序列化，并赋值
 $this->assign('cfg',$cf);//送到前台模板
 $this->display('other/contact');
 }