PHP Session Start: Quick Guide

1 year ago
Benjamin Taylor
1 minute

In PHP, the session mechanism can be called using the following methods:

  1. Call the session_start() function to start a session. This function should be called at the top of the page to ensure that the session is started before using it on the page.
session_start();
  1. Use the $_SESSION superglobal array to store and access session data. Assign the data that needs to be saved to the key names of the $_SESSION array.
// 存储数据
$_SESSION['username'] = 'john_doe';

// 访问数据
echo $_SESSION['username'];
  1. You can use the isset() function to check if a key exists in the session to ensure that the key is not empty before accessing it.
if (isset($_SESSION['username'])) {
    echo 'Welcome, ' . $_SESSION['username'];
} else {
    echo 'Please log in.';
}
  1. Finally, you can use the session_destroy() function to end the current session and clear all session variables.
session_destroy();

Caution: Do not output any content, including spaces and line breaks, before calling the session_start() function, as it will cause the session to fail to start.

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