<?php $string = '13290052201'; $string_length = mb_strlen($phone); $mark_length = 5; $head_length = ceil(($string-$mark_length)/2); $foot_length = $string_length-$head_length-$mark_length; echo mb_substr($string , 0, $head_length) . str_repeat('*', $mark_length) . mb_substr($m, -$foot_length, $foot_length);
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