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<?php $article = '"foo bar baz" bat "quux quuz" this little "piggy" went "to market, this little" piggy "STAYED HOME!"'; $article_clean = preg_replace_callback('/".*?"/', function($v) { return str_replace(' ', '&nbsp;', $v[0]); }, $article); var_dump($article_clean);

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52.56 ms | 402 KiB | 5 Q