Add exams from exam100 to exam150

exam104/example.xml

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+<producers>
+    <producer>
+        <name>Alex</name>
+        <age>21</age>
+        <show>
+            <showname>A show</showname>
+            <showdate>12th December 2010</showdate>
+        </show>
+        <show>
+            <showname>Another show</showname>
+            <showdate>23th Novembar 2024</showdate>
+        </show>
+    </producer>
+    <producer>
+        <name>Nikola</name>
+        <age>16</age>
+        <show>
+            <showname>Better show</showname>
+            <showdate>25th Novembar 2007</showdate>
+        </show>
+    </producer>
+    <producer>
+        <name>Dale</name>
+        <age>49</age>
+    </producer>
+</producers>

exam104/index.php

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+<?php
+//Reading a XML file
+$xml = simplexml_load_file('example.xml');
+
+foreach($xml->producer as $producer){
+    echo $producer->name.' ('. $producer->age  .')'. "<br>";
+    foreach($producer->show as $show){
+        echo $show->showname. ' ('.$show->showdate.')' .'<br>';
+    }
+}
+
+
+?>

exam110/connect.inc.php

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+<?php
+//How to connect to MySQL
+
+
+$mysql_host = 'localhost';
+$mysql_user = 'example_user';
+$mysql_pass = 'Kolosnjaj4321!';
+
+$conn_error = 'Could not connect to database!';
+$mysql_db = 'example_database';
+
+$con = mysqli_connect($mysql_host, $mysql_user, $mysql_pass);
+
+if ($con) {
+    if (mysqli_select_db($con, $mysql_db)) {
+        
+    } else {
+        die($conn_error);
+    }
+}
+?>

exam115/index.php

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+<?php
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+?>
+
+<form action="index.php" method="GET">
+    Choose a food type:
+    <select name="uh">
+        <option value="u">Unhealthy</option>
+        <option value="h">Healthy</option>
+    </select><br><br>
+    <input type="submit" value="Submit">
+</form>
+
+<?php
+
+if (isset($_GET['uh']) && !empty($_GET['uh'])) {
+    $uh = strtolower($_GET['uh']);
+
+    if ($uh == 'u' || $uh == 'h') { 
+
+        $query = "SELECT `food`, `calories` FROM `food` WHERE `healthy_unhealthy` = '$uh' ORDER BY `id` DESC";
+
+        if ($query_run = mysqli_query($con, $query)) {
+            if (mysqli_num_rows($query_run) == NULL) { // Ako je broj redova NULL 
+                echo "No results fount!";
+            } else {
+                while ($query_row = mysqli_fetch_assoc($query_run)) {
+                    $food = $query_row['food'];
+                    $calories = $query_row['calories'];
+
+                    echo $food . ' has ' . $calories . ' calories.<br>';
+                }
+            }
+        } else {
+            echo 'Query failed.';
+        }
+    } else {
+        echo 'Must be u or h';
+    }
+}

exam123/index.php

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+<?php
+//Database Hit counter
+
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+
+$user_ip = $_SERVER['REMOTE_ADDR'];
+
+function ip_exists($ip)
+{
+    global $user_ip, $con;
+    $query = "SELECT ip FROM `hits_ip` WHERE `ip` = '$user_ip' ";
+    $query_run = mysqli_query($con, $query);
+    if (mysqli_num_rows($query_run) == 0) {
+        return false;
+    } else if (mysqli_num_rows($query_run) >= 1) {
+        return true;
+    }
+}
+
+function ip_add($ip)
+{
+    global $con;
+    $query = "INSERT INTO `hits_ip` VALUES ('$ip')";
+    $query_run = mysqli_query($con, $query);
+}
+
+function update_count()
+{
+    global $con;
+    $query = "SELECT `count` FROM `hits_count` ";
+    if ($query_run = mysqli_query($con, $query)) {
+        $row = mysqli_fetch_assoc($query_run);
+        $count = $row['count'];
+        $count_inc = $count + 1;
+
+        $query_update = "UPDATE `hits_count` SET `count` = '$count_inc'";
+        $query_update_run = mysqli_query($con, $query_update);
+           
+    }
+}
+
+if (!ip_exists($user_ip)) {
+    update_count();
+    ip_add(($user_ip));
+}
+
+?>
+
+<h1>My page</h1>

exam123/srcphp5.php

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+<?php
+//Database Hit counter for php 5.0 doesnt work now, because of new version of php. myslql_result() doesnt exists...
+
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+
+$user_ip = $_SERVER['REMOTE_ADDR'];
+
+function ip_exists($ip)
+{
+    global $user_ip; // Sa global omogucavamo da koristimo vrednost promenljive u funkciji
+    echo $user_ip;
+}
+
+function update_count()
+{
+    global $con;
+    $query = "SELECT `count` FROM `hits_count` ";
+    if ($query_run = mysqli_query($con, $query)) {
+        if (mysqli_num_rows($query_run) > 0) {
+ //           $count = mysql_result($query_run, 0,'count');
+ //           $count_inc = $count + 1;
+
+//            $query_update = "UPDATE `hits_count` SET `count` = '$count_inc'";
+//            if ($query_update_run = mysqli_query($con, $query_update)) {
+                echo 'OK';
+            }
+        }
+    }
+//}
+
+update_count();

exam130/index.php

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+<?php
+
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+
+if (isset($_POST['search_name'])) {
+    $search_name = $_POST['search_name'];
+    if (!empty($search_name)) {
+
+        if (strlen($search_name) >= 4) {
+
+            $query = "SELECT `name` FROM `names` WHERE `name` LIKE '%" . mysqli_real_escape_string($con, $search_name) . "%'";
+            $query_run = mysqli_query($con, $query);
+
+            $query_num_rows = mysqli_num_rows($query_run);
+            if ($query_num_rows >= 1) {
+                echo $query_num_rows . ' results found: <br>';
+                while ($query_row = mysqli_fetch_assoc($query_run)) {
+                    echo $query_row['name'] . '<br>';
+                }
+            }
+        } else{
+            echo 'Your keyword must be 5 caracters or more';
+        }
+    }
+}
+
+?>
+
+<form action="index.php" method="POST">
+    Name: <input type="text" name="search_name">
+    <input type="submit" value="Submit">
+</form>

exam135/core.inc.php

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+<?php
+ob_start();
+session_start();
+$current_file = $_SERVER['SCRIPT_FILENAME'];
+
+if(isset($_SERVER['HTTP_REFERER']) && !empty($_SERVER['HTTP_REFERER'])){
+    $http_referer = $_SERVER['HTTP_REFERER'];
+}
+
+function loggedin(){    
+    if (isset($_SESSION['user_id']) && !empty($_SESSION['user_id'])) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+function getuserfield($field){
+    global $con;
+    $query = "SELECT `$field` FROM `users` WHERE `id`= '" . $_SESSION['user_id']. "'";
+    if($query_run = mysqli_query($con,$query)){
+        $row = mysqli_fetch_assoc($query_run);
+        return $field = $row[$field];
+    }
+}
+?>

exam135/index.php

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+<?php 
+
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+require 'core.inc.php';
+
+if (loggedin()) {
+    $firstname = getuserfield('firstname');
+    $surname = getuserfield('surname');
+    echo ' You are logged in '. $firstname. ' '.$surname.' <a href="logout.php">Log out</a><br>';
+} else {
+    include 'loginform.inc.php';
+}
+?> 

exam135/loginform.inc.php

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+<?php
+
+
+
+if (isset($_POST['username']) && isset($_POST['password'])) {
+    $username = $_POST['username'];
+    $password = $_POST['password'];
+    $password_hash = md5($password);
+
+    if (!empty($username) && !empty($password)) {
+        $query = "SELECT `id` FROM `users` WHERE `username` ='" . mysqli_real_escape_string($con, $username) .
+                 "' AND `password` = '" .mysqli_real_escape_string($con, $password_hash )."'";
+        if ($query_run = mysqli_query($con, $query)) {
+            $query_num_rows = mysqli_num_rows($query_run);
+            if ($query_num_rows == 0) {
+                echo 'invalid username/password combination';
+            } else if ($query_num_rows == 1) {
+                //treba nam $user_id
+                $row = mysqli_fetch_assoc($query_run);
+                $user_id = $row['id'];
+
+                $_SESSION['user_id'] = $user_id;
+                header('Location: index.php');
+            }
+        } else {
+        }
+    } else {
+        echo 'You must suply username or password';
+    }
+}
+
+?>
+
+<form action="<?php $current_file; ?>" method="POST">
+    Username: <input type="text" name="username"> Password: <input type="password" name="password">
+    <input type="submit" value="Submit">
+</form>

exam135/logout.php

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+<?php 
+
+require 'core.inc.php';
+
+session_destroy();
+header('Location: '. $http_referer);
+
+?>

exam135/register.php

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+<?php
+require '/var/www/nikola/practice/exam110/connect.inc.php';
+require 'core.inc.php';
+
+// Nece da doda id !!! to pogledaj u ponedeljak
+
+if (!loggedin()) {
+    if (
+        isset($_POST['username']) && isset($_POST['password']) && isset($_POST['password_again']) &&
+        isset($_POST['firstname']) && isset($_POST['surname'])
+    ) {
+        $username = $_POST['username'];
+
+        $password = $_POST['password'];
+        $password_again = $_POST['password_again'];
+        $password_hash = md5($password);
+
+        $firstname = $_POST['firstname'];
+        $surname = $_POST['surname'];
+
+        if (
+            !empty($username) && !empty($password) && !empty($password_again) &&
+            !empty($firstname) && !empty($surname)
+        ) {
+            if(strlen($username) > 30 || strlen($firstname) > 40 || strlen($surname) > 40){
+                echo 'Please ahear to maxlength of fields';
+            }else{
+                if ($password != $password_again) {
+                    echo 'Passwords do not match';
+                } else {
+                    $query = "SELECT `username` FROM `users` WHERE `username` ='$username'";
+                    $query_run = mysqli_query($con, $query);
+                    if (mysqli_num_rows($query_run) == 1) {
+                        echo 'The username ' . $username . 'already exists';
+                    } else {
+                        $query = "INSERT INTO `users` VALUES(NULL ,'" . mysqli_real_escape_string($con, $username) .
+                            "','" . mysqli_real_escape_string($con, $password_hash) . "','" . mysqli_real_escape_string($con, $firstname) .
+                            "','" . mysqli_real_escape_string($con, $surname) . "')";
+                        if($query_run = mysqli_query($con,$query)){
+                            header('Location: register_success.php');
+                        } else {
+                            echo 'We could not register you!';
+                        }
+                        
+                    }
+                }
+            }
+        } else {
+            echo 'All fields are required';
+        }
+    }
+?>
+
+    <form action="register.php" method="POST">
+        Username: <br> <input type="text" name="username" maxlength="30" value="<?php if(isset($username)) {echo $username; } ?>"><br><br>
+        Password: <br> <input type="password" name="password"><br><br>
+        Password again: <br> <input type="password" name="password_again"><br><br>
+        Firstname: <br> <input type="text" name="firstname" maxlength="40" value="<?php if(isset($firstname)) {echo $firstname; }  ?>"><br><br>
+        Surname: <br> <input type="text" name="surname" maxlength="40" value="<?php if(isset($surname)) {echo $surname; } ?>"><br><br>
+        <input type="submit" value="Register">
+    </form>
+
+<?php
+
+} else if (loggedin()) {
+    echo 'You are already registered and logged in !';
+}
+
+?>

exam135/register_success.php

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+<h1>You are registered ! </h1>