<?php $default = ['c2'=>0,'c3'=>0,'c4'=>0,'c5'=>0]; $years = [7,8,9]; $students = [ 20=>7, 21=>11, 420=>8, 52=>12, 55=>9 ]; $students = array_filter($students, function($year) use ($years) { return in_array($year, $years); }); $totals = array_fill_keys(array_keys($students), $default); print_r($totals);
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