php - Number of days in next month not working -

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i'm using below code number of days in next month. displays 31 when there 30 days in november. how solve?

echo date('t',mktime(0,0,0,date("m",strtotime("+1 month")),1,date("y")));

date("m",strtotime("+1 month")) returns string (nov), mktime expects arguments integers. means you're getting 0 value injected instead of next month, give number of days in january

date("n",strtotime("+1 month"))

will return month number


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