在我的mysql表中，“可捕获的致命错误：类DateTime的对象无法转换为字符串”

Question

this code works true, but can't get result on mysql table.

$interval = $posts[4];
$datestring = $dif;    
list($hours, $minutes, $seconds) = explode(':', $interval); 

$date = new DateTime($dif);    
$date->add(new DateInterval('PT'.$hours.'H'.$minutes.'M'.$seconds.'S'));
echo $date->format('H:i:s');
$posts[7]=$date;

Answer 1

You need to assign formated value. instead of $date

 $date = new DateTime($dif);    
 $date->add(new DateInterval('PT'.$hours.'H'.$minutes.'M'.$seconds.'S'));
 $date_format = $date->format('H:i:s');
 $posts[7]=$date_format;