known :
$beginDate = "2018-07";
$endDate = "2018-11";
how to implement :
in codefor example, this month is November, then
2018-11 this month
2018-10 exceeds January
2018-09 exceeds February
2018-08 exceeds March
2018-07 exceeds April
the time after July defaults to "beyond April"
can be implemented using the DateTime class, and DateTime is also an officially recommended method for time calculation
$beginDate = '2018-07;
$endDate =' 2018-02;
$start = new DateTime ($beginDate);
$end = new DateTime ($endDate);
echo sprintf ('past% d months', $end- > diff ($start)-> m > 4? 4: $end- > diff ($start)-> m);
date('m', strtotime('2018-07'))Why does such a simple logic ask? Instead of trying to write
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