<?php $letters1 = range('A', 'C'); $letters2 = array_merge([''], range('A', 'C')); foreach($letters1 as $l1) { foreach($letters2 as $l2) { for($i=1; $i<=20; ++$i) { $result[] = $i.$l1.$l2; } } } print_r($result);
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Value for `_results` contains invalid data `array`