<?php $numbers = [210, 11, 12]; $operators = ['-', '/']; $result = (array)($numbers[0] ?? []); foreach ($operators as $i => $operator) { array_push($result, $operator, $numbers[++$i]); } var_export($result); var_export( array_reduce( $operators, function($result, $value) use($numbers) { static $i = 0; array_push($result, $value, $numbers[++$i]); return $result; }, (array)($numbers[0] ?? []) ) );
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