<?php $pattern = '/(\d{3}(?!$))(\d{3}$)?/'; $replacement = '$1,$2'; $num = 1234; var_dump(preg_replace($pattern, $replacement, $num)); //123,4 $num = 123456789; var_dump(preg_replace($pattern, $replacement, $num)); //123,456,789 $num = 123; var_dump(preg_replace($pattern, $replacement, $num)); //123 $num = 1234567890; var_dump(preg_replace($pattern, $replacement, $num)); //123,456,789,0
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