从其他文件 php 获取变量的值

Question

How will I get the value of variable username from login.php and pass to the query of get.php Login.php

get.php

Answer 1

At the beginning of both files, you should start a session:

<?php
session_start();
?>

Then you should put the username in a session, like shown below:

<?php
if (!empty($_POST["username"]) {
    $_SESSION["username"] = $_POST["username"];
} else {
    echo "<p>You didn't fill in a username</p>";
}
?>

Then in the get.php file remove the "require_once login.php" line, and add the variable $username like so:

<?php
$username = $_SESSION["username"];
$sql = "SELECT firstname, contactnum FROM tb_register  WHERE username= '".$username."'";
?>