সম্পাদনা
<?php function addition($a, $b) { return $a + $b; } function subtraction($a, $b) { return $a - $b; } function calculate($callback, $a, $b) { return $callback($a, $b); } echo calculate("addition", 20, 10); echo " "; echo calculate("subtraction", 20, 10); ?>
পূর্বরূপ
