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@ 2019-03-23T01:51:18Z

<?php

$mainNumber = 6;
$finalData = [];
$operator = '-';
for ($i = 1; $i <= $mainNumber; $i++) {
    switch ($operator) {
        case '-':
            $finalData[] = $mainNumber - $i;
            $operator = '+';
            break;
        case '+':
            $finalData[] = $mainNumber + $i;
            $operator = '-';
            break;
    }
}
print_r($finalData);

Output
Performance
VLD
References
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print_r: documentation ( source)

preferences:dark modelive previewkey bindings

30.21 ms | 404 KiB | 5 Q