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<?php $line = 'You know this brother .'; $input = 'Know brother'; $output = ''; foreach (explode(' ', $line) as $word) { if (preg_match("~$word~i", $input)) { $output .= " <b>$word</b>"; } else { $output .= " $word"; } } var_dump(trim($output));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(44) "You <b>know</b> this <b>brother</b> <b>.</b>"

preferences:
98.86 ms | 1244 KiB | 4 Q