PHP - Last day of the month/Number of days in the month

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Using $m as the number of the month i and $y as year. Function date() can display directly the number of days in the month using the "t" character:

      $month = mktime( 0, 0, 0, $m, 1, $y ); 
      setlocal ('LC_ALL', 'en_EN');
      echo "The month ".date("F Y",$mois)." Has
 ".date("t",$mois)." days";

You can have this value back using :

<? $numberofdays = intval(date("t",$mois)); ?>

PHP 5 - Using an external URL with the function include
Mktime() - Timestamp yesterday, last month, etc.).