PHP formatting time, minutes ago, hours ago

'年',  
        '2592000'=>'个月',  
        '604800'=>'星期',  
        '86400'=>'天',  
        '3600'=>'小时',  
        '60'=>'分钟',  
        '1'=>'秒' 
    );  
    foreach($f as $k=>$v){  
        if(0 != $c = floor($t/(int)$k)){  
            return $c.$v.'前';  
        }  
    }  
}  
echo format_date('1405959031');  
?>