PHP:优化单个字符串中多个字符串的查找和替换过程

$string = "Hello, world! This is a test.";
$search = array("Hello", "world", "test");
$replace = array("Hi", "universe", "example");
$result = str_replace($search, $replace, $string);
echo $result;

$string = "Hello, world! This is a test.";
$search = array("/Hello/", "/world/", "/test/");
$replace = array("Hi", "universe", "example");
$result = preg_replace($search, $replace, $string);
echo $result;

$string = "Hello, world! This is a test.";
$replace = array("Hello" => "Hi", "world" => "universe", "test" => "example");
$result = strtr($string, $replace);
echo $result;