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<?php $format = function ($money) { $pieces = explode('.', $money); $cents = $pieces[1]; $dollars = $pieces[0]; //1000000.50 //1000000 50 //0000001 $str = strrev($dollars); $out = ''; for ($i = 0; $i < strlen($str); $i++) { if ($i % 3 == 0 && $i !== 0) { $out .= ','; } $out .= $str[$i]; } $out = '$' . strrev($out) . '.' . $cents; return $out; }; echo $format('100000');

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