Online PHP editor | output for hSemf

<?php // Input date format: YYYY-mm-dd function getMonthWeekNumbers( $first_date ) { $last_date = date( "Y-m-t",strtotime( $first_date ) ); $first_week = date( "W",strtotime( $first_date ) ); $last_week = date( "W",strtotime( $last_date ) ); // If last day of month have on first week on next year, subtract a week from the date if( $last_week == '01' ) { $last_week = date( "W",( strtotime( $last_date )-604800 ) ); } for( $i=$first_week; $i <= $last_week; $i++ ) { echo "Week #".$i.", "; } } getMonthWeekNumbers( '2019-12-01' );