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sumhat/gist:32e6afec88a6a9a8b575

Last active January 8, 2016 17:10
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gistfile1.php
<?php
function s($a) {
return preg_replace('/(?=\d.*\d.*\d.*\d.*\d)(\d)/', '*', $a);
}
echo s('A1BC23D5678'); // A*BC**D5678
echo s('A1BC233D5Df6G78'); // A*BC***D5Df6G78
echo s('A1212B24543C233D5Df6G78dgag'); // A****B*****C***D5Df6G78dgag
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