What does the backslash with double quote signify in PHP forms?

The backslash with double quote in PHP forms is used to escape characters, specifically the double quote character, within a string. This is necessary when you want to include double quotes within a string that is already enclosed in double quotes. To fix this issue, you can simply add a backslash before the double quote that you want to include within the string. Example:

$name = "John";
$message = "He said, \"Hello, my name is $name.\"";
echo $message;