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@ 2019-03-23T21:32:26Z

<?php
$mainNumber = 6;
$finalData = [];
for ($i = 1; $i <= $mainNumber; ++$i) {
    $finalData[] = $mainNumber + (($i & 1 ? -1 : 1) * $i);
}
var_export($finalData);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

30.56 ms | 404 KiB | 5 Q