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PHP session_start() function
The session_start() function in PHP creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie1. A session is a way to store information (in variables) to be used across multiple pages2.
The session_start() function must be the very first thing in your document, before any HTML tags2. It will call the open and read session save handlers, which will either be a built-in save handler provided by default or by PHP extensions, or a custom handler as defined by session_set_save_handler()1. The read callback will retrieve any existing session data and populate the $_SESSION superglobal array1.
To use a named session, call session_name() before calling session_start()1. The name attribute of the session is needed to reference the form data after the form is submitted2.
The session_start() function returns true if a session was successfully started, otherwise false1. If you want to use multiple sessions in the same script, you can use session_id() to change the session identifier before calling session_start()3.
Here is an example of using the session_start() function to create a new PHP session and set some session variables:
<?php// Start the sessionsession_start();// Set session variables$_SESSION["favcolor"] = "green";$_SESSION["favanimal"] = "cat";echo "Session variables are set.";?>You can access the session variables on other pages by calling session_start() again and using the $_SESSION array:
<?php// Start the sessionsession_start();?><!DOCTYPE html><html><body><?php// Echo session variables that were set on previous pageecho "Favorite color is " . $_SESSION["favcolor"] . ".<br>";echo "Favorite animal is " . $_SESSION["favanimal"] . ".";?></body></html>Learn more✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Explore further
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