How can PHP developers effectively utilize the str_replace() function for string manipulation?

PHP developers can effectively utilize the str_replace() function for string manipulation by specifying the search string, the replacement string, and the input string. This function allows developers to replace all occurrences of the search string with the replacement string in the input string. By using this function, developers can easily manipulate and modify strings in their PHP applications.

$input_string = "Hello, World!";
$search_string = "Hello";
$replacement_string = "Hi";

$output_string = str_replace($search_string, $replacement_string, $input_string);

echo $output_string; // Output: Hi, World!