{"id":411,"date":"2021-06-10T14:49:34","date_gmt":"2021-06-10T13:49:34","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/?page_id=411"},"modified":"2021-06-10T15:51:41","modified_gmt":"2021-06-10T14:51:41","slug":"session-variables","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/php\/session-variables\/","title":{"rendered":"Session Variables"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignright wp-image-196\" src=\"https:\/\/blogs.glowscotland.org.uk\/sh\/public\/ahscomputinghtml\/uploads\/sites\/3275\/2021\/06\/05211152\/sqa-ah.png\" alt=\"\" width=\"100\" height=\"97\" \/><a href=\"https:\/\/www.w3schools.com\/pHp\/php_sessions.asp\" target=\"_blank\" rel=\"noopener noreferrer\"><img decoding=\"async\" class=\"image-59 alignright\" src=\"https:\/\/glow-prod-sh.s3.eu-west-1.amazonaws.com\/sh\/public\/ahscomputinghtml\/uploads\/sites\/3275\/2021\/06\/03210120\/w3schools-150x150.png?X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&#038;X-Amz-Security-Token=IQoJb3JpZ2luX2VjELD%2F%2F%2F%2F%2F%2F%2F%2F%2F%2FwEaCWV1LXdlc3QtMSJHMEUCIC1nf9jWoq6ZrcO03YQ1syYULomD4nK%2B%2BMCHrurohsqXAiEApXBiff3q3a9UIPo6pYHPcf7cnZ9kU%2Fiv24u72GhloO4quQUIeRAFGgwyNzM1NzAxOTU0MzMiDNbH8bQqPJCjF6NuZiqWBblzUj3t387XBtx%2FWnRK50CUAM57BxbIMEHpR7qo3Bsn%2FcHunlidz%2FxzyB%2FMVRg3dWeAgQm0dtXv4pHMEAynd%2FrttZpT9WglWbj6V%2FPv3ycX0Sz4yfCSFT4ycsLKbPam%2BJNAV9spTXyRjxHuw4pVVio%2Fm7ch18JnXc%2Bm0aR0nn6xnMrS%2BpmUM%2F07dGjdEw5hQCzMbHHU7dc70ddiHlPixPONiK6gHQrflRBW75bRu%2B%2B0Hri%2FtXkGZwchp0muWUN%2F8rRg59d0MnSpcH37JyrtkLcK0BUT70kfn5Aluj8B0To%2F%2F0LGbBpcjwv4suoKrnYk5LtDhr0XabzaN%2BX8x51sPk5nYqyhfzyc11ZhW7NtKWBUtHn6Ad8OZLv3R4flfJl2c9mdK9godZLBs86hGyfo7bnUash46Ot9C9jrlTkq44YKgRLHR3mr5dAsNz2pniZGU3co1eByC5rXbGzBGhrEYvmgUqXA7kAKYiHc57%2FtpF%2F4lw6m2p2U024s5XSQyrkzDHRa3ex5Q1k4pHMYzTI5YiDovH0JRFrW0vwRQ%2FmXTPVo%2BHEpL2cZ%2BMV8iZDVgHSaxuzRA6hUnSqE4j1u7mzx6Xhsxh598KOP5GuTETQ4VkRo4zFjbGcvSpdJdp40CttQxxVgVgZFwwbaHwBz%2B5a2xFxZKiKvFYG%2B2KrizPOIw4XUCWBQhsxMRtBwboF%2FCkiRk7TZQIYUSmOWq0oPzKjktRTklZG8VyGwanfqFcWUsaE%2F4kj4zgkBwv3J7SiVcywQwMVgPZwamm5sINogpD59pdDxpQPQWg1zlcqr6JHrNGdqv6kd5Bd%2FGbzQ60nrkyCF4wCo1N%2BxPue3W8tZAXzWfPPboWPEZnvU7btVml9VN4dN9PkrsSPcMMjZ6NYGOrEBaZtwXXAJlaW3bAP4AO7LNHb3HOkmEkS9zOKKqj3GrELKhn70CfnEy3Wh0hL5KD3wTgx3LAi3FwXTIpg3zCoN3kOmvraH4d08THWTanQF2ZbA1F0Wv4YVx%2Bt4f5b3e0XpsSG9OvUX7wdm5CIQdJTxYzEOiHefmKjhlnhpK9ccQrfZi12HJDavEGIwh3DElCocUBL%2Fm69eAo1LCkag%2Bj6FzKzAwCGFb59%2FIZX8B%2Fzvo0No&#038;X-Amz-Algorithm=AWS4-HMAC-SHA256&#038;X-Amz-Credential=ASIAT7MQN47USL27UPUM%2F20261022%2Feu-west-1%2Fs3%2Faws4_request&#038;X-Amz-Date=20261022T153853Z&#038;X-Amz-SignedHeaders=host&#038;X-Amz-Expires=900&#038;X-Amz-Signature=2f9ed3291375e03c165ed40fb0570af0242b6f3b7bf0eb0a1ae4a4e25d8a1c4a\" alt=\"\" width=\"50\" height=\"47\" \/><\/a>When a browser loads a new web page, it forgets all the information from the previous page. A PHP session is a way of storing information within a website, so that it can be retained and used across multiple pages.<br \/>\nExamples of session use are:<\/p>\n<ul>\n<li>displaying a user\u2019s id on multiple pages, following a successful login<\/li>\n<li>retaining selected items in a shopping cart, as the user navigates from page to page<\/li>\n<li>retaining values, such as a user\u2019s quiz Score, when each new question page loads<\/li>\n<\/ul>\n<h1>Starting a session<\/h1>\n<p>The following PHP function is used to start a session. This should be placed at the top of a page, before any HTML code. If data is being passed between multiple pages, each page that requires access to the session should contain the PHP code below.<\/p>\n<p>When a new session starts, a user key is stored on the user\u2019s computer. The session_start() function looks to see if a user key exists. If it does, the current session is continued. If no user key exists, a new session is started.<\/p>\n<pre class=\"brush: php; highlight: [1,2,3]; title: PHP; notranslate\" title=\"PHP\">&lt;?php\r\n   session_start();\r\n?&gt;\r\n&lt;!DOCTYPE html&gt;\r\n&lt;html&gt;\r\n&lt;head&gt;\r\n<\/pre>\n<p>&nbsp;<\/p>\n<h1>Session Variables<\/h1>\n<p>Session variables can be assigned values, or have their values checked in any file that contains the session_start() function.<\/p>\n<pre class=\"brush: php; highlight: [2,5]; title: PHP; notranslate\" title=\"PHP\">\r\nif (!isset() {$_SESSION&#x5B;'loggedin']) {\r\n    $_SESSION&#x5B;'loggedin'] = False;\r\n}\r\n...\r\n$_SESSION&#x5B;'username'] = $username;\r\n<\/pre>\n<pre class=\"brush: php; title: PHP; notranslate\" title=\"PHP\">\r\nif ($_SESSION&#x5B;'loggedin'] == True) {\r\n    echo &quot;&lt;p&gt;Logged in as: &quot; . $_SESSION&#x5B;'username'] . &quot;&lt;\/p&gt;&quot;;\r\n    \/\/ display rest of page\r\n} else {\r\n    echo &quot;&lt;p&gt;Not logged in&lt;\/p&gt;&quot;;\r\n    \/\/ display page with a login button\r\n}\r\n<\/pre>\n<h1>Ending a session<\/h1>\n<p>The PHP function session_destroy() is used to end a session. In this example, logout.php is ran when a &#8220;Log Out&#8221; button on other pages is clicked. The code below destroys the session and then reloads the home page.<\/p>\n<pre class=\"brush: php; title: logout.php; notranslate\" title=\"logout.php\">\r\n&lt;?php\r\n    session_start();\r\n?&gt;\r\n \r\n&lt;?php\r\n    session_destroy();\r\n    include &quot;index.php&quot;;\r\n    die;\r\n\/php&gt;\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>When a browser loads a new web page, it forgets all the information from the previous page. A PHP session is a way of storing information within a website, so that it can be retained and used across multiple pages. Examples of session use are: displaying a user\u2019s id on multiple pages, following a successful login retaining selected items in a shopping cart, as the user navigates from page to<\/p>\n<p><a class=\"more-link\" href=\"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/php\/session-variables\/\">Read More<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"parent":343,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-411","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/comments?post=411"}],"version-history":[{"count":11,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/411\/revisions"}],"predecessor-version":[{"id":425,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/411\/revisions\/425"}],"up":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/343"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/media?parent=411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}