A PHP-related problem is in a hurry for a long time. please help me.

A php problem has been solved for a long time. Ask the experts to help PHPcode $ query = mysql_query (& quot; selectold_titlefrompagecontentswhereold_id = 6316 & quot;) ordie (mysql_error ()); whil is a PHP problem. it has been bothering me for a long time. please help me.

PHP code

  $ Query = mysql_query ("select old_title from pagecontents where old_id = 6316") or die (mysql_error (); while ($ rows = mysql_fetch_array ($ query )) {$ a = $ rows ['old _ title']; ......

I want to process the read old_title into an English, number, or English symbol ("./() _"), and add a space. what should I do? Do you want to use regular expressions?

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PHP code

$ A = preg_replace ('/[\ w. \/()]/I', '$ 0', $ rows ['old _ title']);