Sticky fields and session example from a Well House Consultants training course
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This example is described in the following article(s): • PHP sessions - a best practice teaching example - [link] |
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Source code: thirdmultipage.php Module: H301
<?php
/* This demonstrates a framework for a Session based application in PHP. I've put all
the elements into a single file to demonstrate the various concepts; in practise, the
application would be much longer and split between a number of files ... this is the
third of three demonstrations; here we have move the sticky field logic into a web
helper function */
function inputbox($fname, $sz=20) {
return "<input name=$fname value=\"" . htmlspecialchars($_POST[$fname]) ."\" size=$sz>";
}
session_name("concept_demo"); // In case there are several session based applications
session_start();
if (! $_SESSION["current_page"]) {
$_SESSION["current_page"] = "loggedout";
$_SESSION["sofar"] = array();
}
$errormessage = "";
$fill = array();
// Handle the incoming request
switch ($_SESSION["current_page"]) {
case "loggedout":
$_SESSION["current_page"] = "loginoffer";
break;
case "loginoffer": // Real application - database & password check!
if ($_POST["user"] == "trainee" or $_POST["user"] == "admin") {
$_SESSION["user"] = $_POST["user"];
$_SESSION["current_page"] = "mainmenu";
} else { // Real application - don't tell user names!
$errormessage = "Only supports users 'trainee' and 'admin'";
}
break;
case "mainmenu":
if ($_POST["option"] == "done") {
$_SESSION["current_page"] = "loggedout";
} elseif ($_POST["option"] == "enter") {
$_SESSION["current_page"] = "dataentry";
} elseif ($_POST["option"] == "display") {
$_SESSION["current_page"] = "datadisplay";
} else {
$errormessage = "Please choose one of the options";
}
break;
case "dataentry": // Real application - store to database!
if (preg_match('/\S\s+\S/',$_POST["thought"])) {
array_push($_SESSION["sofar"],$_POST["thought"]);
$_SESSION["current_page"] = "mainmenu";
} else {
$errormessage = "Your mind has gone blank - say SOMETHING!";
}
break;
case "datadisplay":
$_SESSION["current_page"] = "mainmenu";
break;
default:
die("Bad page status (1)");
break;
}
$fill["errormessage"] = $errormessage;
$fill["current"] = $_SESSION["current_page"];
// ---------- Now prepare for next page --------------
switch ($_SESSION["current_page"]) {
case "loggedout":
$fill["title"] = "Logged Out";
$form = "Thank you for spending time with us";
session_destroy();
break;
case "loginoffer":
$fill["title"] = "Please Log in";
$form = "<form method=POST>Name: " . inputbox("user") . " <input type=submit></form>";
break;
case "mainmenu":
$fill["title"] = "Please select what you want to do";
$form = "<form method=POST><select name=option>";
$form .= "<option value=xxx SELECTED>---</option>";
$form .= "<option value=enter>Enter Fresh Data</option>";
$form .= "<option value=display>Display all data so far</option>";
$form .= "<option value=done>Logout</option>";
$form .= "</select> <input type=submit></form>";
break;
case "dataentry":
$fill["title"] = "Please enter your thoughts ...";
$form = "<form method=POST> " . inputbox("thought",60) . " <input type=submit></form>";
break;
case "datadisplay":
$fill["title"] = "Here is what you have entered so far ...";
$form = "<b>So far, you have written ...</b><br>";
foreach ($_SESSION["sofar"] as $nextline) {
$form .= htmlspecialchars($nextline) . "<br/>";
}
$form .= "<form method=POST><input type=submit></form>";
break;
default:
die("Bad page status (2)");
break;
}
$fill["form"] = $form;
$html = file_get_contents("template.htp");
foreach (array_keys($fill) as $fn) {
$html = preg_replace("/%$fn%/",$fill[$fn],$html);
}
print ($html);
?>
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