<?php function embolden($needle, $haystack) { $needle = str_split($needle); foreach ($needle as &$l) { $l = preg_quote($l); } unset($l); $needle = implode('[^0-9]*', $needle); return preg_replace('(' . $needle . ')', '<b>$0</b>', $haystack); } echo embolden('1234', '(123) 456-7890');
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