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<?php $m = '13290052201'; $l = 5; $f = ceil((mb_strlen($m)-$l)/2); var_dump(mb_substr($m, 0, $f) . str_repeat('*', $l) . mb_substr($m, 0, mb_strlen($m)-$l-$f));
Output for git.master, git.master_jit, rfc.property-hooks
string(11) "132*****132"

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