PHP flash message using session

Flash message is used to convey success messages, error messages, or other important information from one page into another page. By using $_SESSION we can transfer a message from one page to another. This examples shows how to display session based flash message in PHP.

flash.php

<?php 
  function flash($name='',$msg='',$cate='green'){
    if(!empty($name)){
      if(!empty($msg)&&empty($_SESSION[$name])){
        $_SESSION[$name]=$name;
        $_SESSION[$name."_msg"]=$msg;
        $_SESSION[$name."_cate"]=$cate;
      }
      else if(empty($msg)&&!empty($_SESSION[$name])){
        echo "<h3 style='padding:5px;color:white;background-color:{$_SESSION[$name."_cate"]}' >{$_SESSION[$name."_msg"]}</div>";
        unset($_SESSION[$name]);
        unset($_SESSION[$name."_msg"]);
        unset($_SESSION[$name."_cate"]);
      }
    }
  }
?>

<?php 
  session_start();
  include "flash.php";
  
  #Call flash for assign message in login Page
  flash('login','Login Successfully');
  //header("location:home.php");
?>

home.php

<?php 
  session_start();
  include "flash.php";
  
  #call flash for display message
  echo flash('login');
?>