我正在使用此代碼：

$due_date = new DateTime($_POST['due_date']);

$today = new DateTime();

$months = $due_date->diff($today);

$months->format("%m");

$fine = 0.02 * $price * $months; // i got error in this line

$bill = $price + $fine;

我想計算一下,如果有人遲到,那么他們將每月被罰款.錯誤消息是：

Object of class DateInterval could not be converted to int

解決方法:

出現錯誤消息是因為$months不是一個int,而是一個類似這樣的Datetime對象：

DateInterval Object

(

[y] => 0

[m] => 4

[d] => 12

[h] => 6

[i] => 56

[s] => 9

[weekday] => 0

[weekday_behavior] => 0

[first_last_day_of] => 0

[invert] => 0

[days] => 133

[special_type] => 0

[special_amount] => 0

[have_weekday_relative] => 0

[have_special_relative] => 0

)

你可以這樣獲得月份的整數值

$due_date = new DateTime('13-02-2016');

$today = new DateTime();

$months = $due_date->diff($today);

echo $months->m;

所以基本上你的代碼看起來像

$due_date = new DateTime($_POST['due_date']);

$today = new DateTime();

$months = $due_date->diff($today);

$fine = 0.02 * $price * $months->m; // i got no error in this line

$bill = $price + $fine;

標簽：date-math,dateinterval,datetime,php,date

來源： https://codeday.me/bug/20191118/2028532.html

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