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<?php $money = 100000000; $len = strlen($money); $m = ''; $money = strrev($money); for ($i = 0; $i < $len; $i++) { if (($i == 3 || ($i > 3 && ($i - 1) % 2 == 0)) && $i != $len) { $m .= ','; } $m .= $money[$i]; } echo strrev($m);

preferences:
59.16 ms | 402 KiB | 5 Q