Simple PHP string replace?

$abc = ' Hello "Guys" , Goodmorning';

$new_string = str_replace("\"", '$^', $abc);
echo $new_string;

output:

Hello $^Guys$^ , Goodmorning

str_replace('"','$^',$abc);

Should work for you.

Have a look at str_replace

$abc = ' Hello "Guys" , Goodmorning';
$abc = str_replace('"', '$^', $abc);