3v4l.org

run code in 300+ PHP versions simultaneously
<?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);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Array ( [20] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) [420] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) [55] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) )
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Array ( [20] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) [420] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) [55] => Array ( [c2] => 0 [c3] => 0 [c4] => 0 [c5] => 0 ) )

preferences:
197.25 ms | 402 KiB | 287 Q