programming

• $_SESSION['variable'] : Identify the PHP function used to retrieve the value of a specific session variable.
• HTTP POST method


  Method used to send larger amounts of data, such as form data, in the request body instead of the URL.
• HTTP GET method


  Method used to send small amounts of data, such as a username or a search query, in the URL.
• Check if variable is set


  Use `isset()` function or the null coalescing operator `??` to check if the variable is set before using it, to avoid any undefined index error.
• PREG_OFFSET_CAPTURE to find the position in the input string in which the matches were found