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Finished Chapter 14 exercise 2
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‎.devcontainer/devcontainer.json‎

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// For format details, see https://aka.ms/devcontainer.json. For config options, see the
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// README at: https://github.com/devcontainers/templates/tree/main/src/php
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{
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"name": "PHP",
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// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
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"image": "mcr.microsoft.com/devcontainers/php:1-8.2-bullseye",
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// Features to add to the dev container. More info: https://containers.dev/features.
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// "features": {},
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// Configure tool-specific properties.
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// "customizations": {},
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// Use 'forwardPorts' to make a list of ports inside the container available locally.
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"forwardPorts": [8080]
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// Use 'postCreateCommand' to run commands after the container is created.
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// "postCreateCommand": "sudo chmod a+x \"$(pwd)\" && sudo rm -rf /var/www/html && sudo ln -s \"$(pwd)\" /var/www/html"
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// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
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// "remoteUser": "root"
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}

‎.github/dependabot.yml‎

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# To get started with Dependabot version updates, you'll need to specify which
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# package ecosystems to update and where the package manifests are located.
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# Please see the documentation for more information:
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# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
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# https://containers.dev/guide/dependabot
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version: 2
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updates:
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- package-ecosystem: "devcontainers"
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directory: "/"
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schedule:
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interval: weekly

‎ch14_formvalidator.php‎

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<?php
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if (!isset($_GET["username"]) && !isset( $_GET["email"])) {
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echo "PHP is working correctly. Congratulations!";
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return;
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}
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header("Content-Type: application/json");
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header("Cache-Control: no-cache");
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// type for returned data
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class ReturnObject {
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public $available;
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public $searchTerm;
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public function __construct() {
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}
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}
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// get query string as associative array
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parse_str($_SERVER['QUERY_STRING'], $query);
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$values = array("username" => array("jmcpeak","pwilton"),
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"email" => array("someone@zyx.com", "someone@xyz.com"));
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function processRequest() {
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global $query, $values;
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$obj = new ReturnObject();
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$obj->available = TRUE;
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foreach($query as $key => $value) {
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$arrValues = $values[$key];
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$obj->searchTerm = $value;
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for ($ii = 0; $ii < count($arrValues); $ii++) {
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if (strtolower($arrValues[$ii]) == strtolower($value)) {
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$obj->available = FALSE;
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break;
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}
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}
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}
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return $obj;
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}
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echo json_encode(processRequest());
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?>

‎ch14exercise2.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<title>Chapter 14: Example 1</title>
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<style>
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.fieldname {
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text-align: right;
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}
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.submit {
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text-align: right;
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}
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</style>
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</head>
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<body>
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<form id="whole">
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<table>
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<tr>
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<td class="fieldname">
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Username:
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</td>
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<td>
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<input type="text" id="username" />
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</td>
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</tr>
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<tr>
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<td class="fieldname">
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Email:
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</td>
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<td>
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<input type="text" id="email" />
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</td>
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</tr>
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<tr>
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<td class="fieldname">
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Password:
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</td>
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<td>
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<input type="text" id="password" />
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</td>
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<td />
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</tr>
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<tr>
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<td class="fieldname">
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Verify Password:
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</td>
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<td>
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<input type="text" id="password2" />
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</td>
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<td />
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</tr>
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<tr>
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<td colspan="2" class="submit">
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<input type="submit" value="Submit" id="Sub" />
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</td>
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<td />
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</tr>
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</table>
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</form>
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<script src="ch14exercise1.js"></script>
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<script>
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function checkUsername(e) {
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e.preventDefault();
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var userValue = document.getElementById("username").value;
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if (!userValue) {
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alert("Please enter a user name to check!");
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return;
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}
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var url = "ch14_formvalidator.php?username=" + userValue;
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var request = new HttpRequest(url, handleUsername, true);
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request.send();
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}
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function checkEmail() {
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e.preventDefault();
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var emailValue = document.getElementById("email").value;
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if (!emailValue) {
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alert("Please enter an email address to check!");
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return;
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}
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var url = "ch14_formvalidator.php?email=" + emailValue;
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var request = new HttpRequest(url, handleEmail, true);
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request.send();
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}
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function handleUsername(responseText) {
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var response = JSON.parse(responseText);
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if (response.available) {
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alert(response.searchTerm + " is available!");
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checkEmail();
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} else {
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alert("We're sorry, but " + response.searchTerm + " is not available.");
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return;
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}
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}
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function handleEmail(responseText) {
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var response = JSON.parse(responseText);
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if (response.available) {
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alert(response.searchTerm + " is available!");
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document.getElementById("Sub").submit();
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} else {
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alert("We're sorry, but " + response.searchTerm + " is not available.");
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return;
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}
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}
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document.getElementById("Sub").addEventListener("click", checkUsername);
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</script>
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</body>
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</html>

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