On Friday 12 November 2004 04:49, Justin French wrote:
> What's the quickest way to add a space every four characters?
>
> Eg 123456789 becomes 1234 5678 9
No idea whether it's the quickest (in terms of cpu time):
$doo = '123456789';
$dah = preg_replace('/(\d{4})/', '\\1 ', $doo);
echo $dah;
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