I would like to draw red on all the 123 results, but the returned result is 008, instead of the expected 0560708. what is the problem?

I want to draw a red line between all 123, but the returned result is 008, instead of the expected 0560708. what is the problem? & Lt ;? Php $ subject = 1235612371238; $ word = 123; $ pattern = "#. * ($ word ). * # sUi "; echo & I want to draw red all 123, but the returned result is 008, not the expected 0560708. what is the problem?

 $ Subject = 1235612371238;
$ Word = 123;
$ Pattern = "#. * ($ word). * # sUi ";
Echo preg_replace ($ pattern, "0", $ subject );
?>

I want to draw a red line between all 123, but the returned result is 008, instead of the expected 0560708. what is the problem?
------ Solution --------------------

 $ Subject = 1235612371238;
$ Word = 123;
$ Pattern = "/. * ($ word). */sUi ";
// Echo preg_replace ($ pattern, "0", $ subject );
Var_dump (Strtr ($ subject, Array ('000000' => '0 ')));