{"id":386,"date":"2021-06-10T13:35:30","date_gmt":"2021-06-10T12:35:30","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/?page_id=386"},"modified":"2021-06-10T15:46:55","modified_gmt":"2021-06-10T14:46:55","slug":"processing-form-data","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/php\/processing-form-data\/","title":{"rendered":"Processing Form Data"},"content":{"rendered":"

\"\"\"\"<\/a>Reading Form Data<\/h1>\n

Data from HTMl forms can be sent using GET or POST methods.<\/p>\n

PHP needs to use the correct commands to match the method used.<\/p>\n

\r\n$forename = $_POST["firstname"];\r\n$surname = $_POST["lastname"];\r\n<\/pre>\n
\r\n$forename = $_GET["firstname"];\r\n$surname = $_GET["lastname"];\r\n<\/pre>\n
Either method can be used by checking the method used:<\/p>\n
\r\nif ($_SERVER["REQUEST_METHOD"] == "POST") {\r\n    $forename = $_POST["firstname"];\r\n    $surname = $_POST["lastname"];\r\n} elseif ($_SERVER["REQUEST_METHOD"] == "GET") {\r\n    $forename = $_GET["firstname"];\r\n    $surname = $_GET["lastname"];\r\n}\r\n<\/pre>\n
Checking for Existence of values<\/h1>\n
HTML forms only send data that has been entered, or given default values.<\/p>\n
A form may have optional data input items, and trying to read these will cause the PHP program to stop. If this is a possibility, then check that the values exist first:<\/p>\n
\r\nforename = "";\r\nif (isset($_POST["firstname"])) {\r\n    $forename = cleanInput($_POST["firstname"]); \r\n}\r\n<\/pre>\n
This can be written, at the expense of readability as:<\/p>\n
\r\n$forename = isset($_GET['firstname']) ? $_GET['firstname'] : '';\r\n<\/pre>\n
Pre-Processing Form Data<\/h1>\n
Form data will often used to create SQL queries, with the potential for SQL injection attacks.<\/p>\n
Although not a requirement for the AH course, clearing form data of any unwanted characters may be useful for project work.<\/p>\n
\r\nfunction cleanInput($data) {\r\n    $data= trim($data);\r\n    $data = stripslashes($data);\r\n    $data = htmlspecialcharacters($data);\r\n    return $data\r\n}\r\n \r\n$forename = cleanInput($_POST["firstname"]);\r\n$surname = cleanInput($_POST["lastname"]);\r\n\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Reading Form Data Data from HTMl forms can be sent using GET or POST methods. PHP needs to use the correct commands to match the method used. $forename = $_POST["firstname"]; $surname = $_POST["lastname"]; $forename = $_GET["firstname"]; $surname = $_GET["lastname"]; Either method can be used by checking the method used: if ($_SERVER["REQUEST_METHOD"] == "POST") { $forename = $_POST["firstname"]; $surname = $_POST["lastname"]; } elseif ($_SERVER["REQUEST_METHOD"] == "GET") { $forename = $_GET["firstname"]; $surname<\/p>\n
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-386","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/386","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=386"}],"version-history":[{"count":9,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/386\/revisions"}],"predecessor-version":[{"id":423,"href":"https:\/\/blogs.glowscotland.org.uk\/sh\/ahscomputinghtml\/wp-json\/wp\/v2\/pages\/386\/revisions\/423"}],"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=386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}