What is the difference between an escape sequence and a replacement representation in PHP?

An escape sequence is a sequence of characters that represents a special character in a string, such as a newline or a tab. On the other hand, a replacement representation is a way to replace certain characters in a string with other characters. To implement the fix, you can use escape sequences to represent special characters in a string, and use functions like str_replace to replace specific characters with others.

// Using escape sequences
$string = "This is a string with a newline \n and a tab \t";
echo $string;

// Using str_replace for replacement representation
$string = "Hello, World!";
$new_string = str_replace("World", "PHP", $string);
echo $new_string;