how to check month in a date using php code example

Example 1: datetime get month php

$dateTime = new DateTime();
$month = $dateTime->format('m');

Example 2: php check if day in month

// function
cal_days_in_month(calendar,month,year);
//e.g.
$d=cal_days_in_month(CAL_GREGORIAN,10,2005);
echo "There was $d days in October 2005";