esercizi su mysql, box model, cookie e sessioni

php13_session.php

@@ -0,0 +1,102 @@
+
+<?php
+
+session_start();
+
+	$def1 ='black';
+	$def2 = 'red';
+
+if (!empty($_GET)){
+	$def1 =$_GET['back'];
+	$def2 =$_GET['color'];
+} 
+
+
+
+
+if (empty($_SESSION)){
+	$_SESSION['ip'] = $_SERVER['REMOTE_ADDR'];
+	$_SESSION['ua'] = $_SERVER['HTTP_USER_AGENT'];
+	$_SESSION['val1'] = $def1;
+	$_SESSION['val2'] = $def2;
+
+} else {
+
+	if ( ( isset($_SESSION['ip']) && ($_SESSION['ip'] != $_SERVER['REMOTE_ADDR']))  ||  ( isset($_SESSION['ua']) && ($_SESSION['ua'] != $_SERVER['HTTP_USER_AGENT'])) ){
+		session_destroy();
+		session_start();
+		$_SESSION['ip'] = $_SERVER['REMOTE_ADDR'];
+		$_SESSION['ua'] = $_SERVER['HTTP_USER_AGENT'];
+		$_SESSION['val1'] = $def1;
+		$_SESSION['val2'] = $def2;
+	}
+}
+
+if (!empty($_GET)){
+$_SESSION['val1'] = $_GET['back'];
+$_SESSION['val2'] = $_GET['color'];
+}
+
+$def1=$_SESSION['val1'];
+$def2=$_SESSION['val2'];
+
+
+require_once ('functions.php');
+include('header.html');
+
+///////////////////////////
+echo<<<_css
+
+<style>
+
+p {
+	background-color:$def1;
+	color:$def2;
+}
+
+
+</style>
+_css;
+echo "\n";
+///////////////////////////
+
+
+$acolor = array ("Red"=>"red","Green"=>"green","Blue"=>"blue");
+
+
+
+echo "<p>", "Sample Text", "</p>\n";
+
+echo "<form>";
+echo "<select name=\"back\">";
+foreach ($acolor as $desc => $value){
+	echo "<option value =$value ";
+	echo $def1 == $value ? "selected" : "" ;
+	echo "> $desc</option>";
+}
+
+echo "</select>";
+
+echo "<select name=\"color\">";
+foreach ($acolor as $desc => $value){
+	echo "<option value =$value ";
+	echo $def2 == $value ? "selected" : "" ;
+	echo "> $desc</option>";
+}
+
+echo "</select>";
+
+echo "<input type=\"submit\" value=\"Invia\"/>";
+echo "</form>";
+
+
+
+
+
+
+include ('footer.html');
+
+
+
+
+  ?>