code-boxx/0-PHP-WEB-APP.MD

## 0-PHP-WEB-APP.MD

      
    Raw
  

              0-PHP-WEB-APP.MD
            
          
    SIMPLE PHP MYSQL WEB APP EXAMPLE

https://code-boxx.com/simple-php-web-application/
NOTES


Create a database and import the 1-database.sql file.
Change the database settings in 2-todo-lib.php to your own.
Launch 3a-todo.php in your browser.

LICENSE

Copyright by Code Boxx
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

  
## 1-database.sql
CREATE TABLE `todo` (
  `todo_id` bigint(20) NOT NULL,
  `todo_task` text NOT NULL,
  `todo_status` tinyint(1) NOT NULL DEFAULT 0
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `todo`
  ADD PRIMARY KEY (`todo_id`);

ALTER TABLE `todo`
  MODIFY `todo_id` bigint(20) NOT NULL AUTO_INCREMENT;

## 2-todo-lib.php
<?php
class ToDo {
  // (A) CONSTRUCTOR - CONNECT TO DATABASE
  private $pdo = null;
  private $stmt = null;
  public $error = "";
  function __construct () {
    $this->pdo = new PDO(
      "mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
      DB_USER, DB_PASSWORD, [
      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
    ]);
  }

  // (B) DESTRUCTOR - CLOSE DATABASE CONNECTION
  function __destruct () {
    if ($this->stmt!==null) { $this->stmt = null; }
    if ($this->pdo!==null) { $this->pdo = null; }
  }

  // (C) HELPER - RUN SQL QUERY
  function query ($sql, $data=null) : void {
    $this->stmt = $this->pdo->prepare($sql);
    $this->stmt->execute($data);
  }

  // (D) SAVE TO-DO TASK
  function save ($task, $status, $id=null) {
    if ($id===null) {
      $sql = "INSERT INTO `todo` (`todo_task`, `todo_status`) VALUES (?,?)";
      $data = [$task, $status];
    } else {
      $sql = "UPDATE `todo` SET `todo_task`=?, `todo_status`=? WHERE `todo_id`=?";
      $data = [$task, $status, $id];
    }
    $this->query($sql, $data);
    return true;
  }

  // (E) GET ALL TASKS
  function getAll () {
    $this->query("SELECT * FROM `todo`");
    return $this->stmt->fetchAll();
  }

  // (F) DELETE TASK
  function del ($id) {
    $this->query("DELETE FROM `todo` WHERE `todo_id`=?", [$id]);
    return true;
  }
}

// (G) DATABASE SETTINGS - CHANGE TO YOUR OWN!
define("DB_HOST", "localhost");
define("DB_NAME", "test");
define("DB_CHARSET", "utf8mb4");
define("DB_USER", "root");
define("DB_PASSWORD", "");

// (H) NEW TO-DO OBJECT
$TODO = new ToDo();

## 3a-todo.php
<!DOCTYPE html>
<html>
  <head>
    <title>Simple To Do List</title>
    <meta charset="utf-8">
    <link rel="stylesheet" href="3b-todo.css">
    <script src="3c-todo.js"></script>
  </head>
  <body>
    <?php
    // (A) ADD/UPDATE/DELETE TASK IF FORM SUBMITTED
    require "2-todo-lib.php";
    if (isset($_POST["action"])) {
      // (A1) SAVE TASK
      if ($_POST["action"]=="save") {
        $pass = $TODO->save($_POST["task"], $_POST["status"], (isset($_POST["id"])?$_POST["id"]:null));
      }

      // (A2) DELETE TASK
      else { $pass = $TODO->del($_POST["id"]); }

      // (A3) SHOW RESULT
      echo "<div class='notify'>";
      echo $pass ? "OK" : $TODO->error ;
      echo "</div>";
    }
    ?>

    <!-- (B) NINJA DELETE FORM -->
    <form id="ninForm" method="post">
      <input type="hidden" name="action" value="del">
      <input type="hidden" name="id" id="ninID">
    </form>

    <div id="tasks">
      <!-- (C) ADD NEW TASK -->
      <form method="post">
        <input type="hidden" name="action" value="save">
        <input type="text" id="taskadd" name="task" placeholder="Task" required>
        <select name="status">
          <option value="0">Pending</option>
          <option value="1">Done</option>
          <option value="2">Canceled</option>
        </select>
        <input type="submit" value="Add">
      </form>

      <!-- (D) LIST TASKS -->
      <?php
      $tasks = $TODO->getAll();
      if (count($tasks)!=0) { foreach ($tasks as $t) { ?>
      <form method="post">
        <input type="button" value="X" onclick="deltask(<?=$t["todo_id"]?>)">
        <input type="hidden" name="action" value="save">
        <input type="hidden" name="id" value="<?=$t["todo_id"]?>">
        <input type="text" name="task" placeholder="Task" value="<?=$t["todo_task"]?>">
        <select name="status">
          <option value="0"<?=$t["todo_status"]==0?" selected":""?>>Pending</option>
          <option value="1"<?=$t["todo_status"]==1?" selected":""?>>Done</option>
          <option value="2"<?=$t["todo_status"]==2?" selected":""?>>Canceled</option>
        </select>
        <input type="submit" value="Save">
      </form>
      <?php }} ?>
    </div>
  </body>
</html>

## 3b-todo.css
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
.notify {
  background: #ecefff;
  border: 1px solid #bfc4ff;
  padding: 5px;
  margin-bottom: 10px;
}
#tasks { max-width: 500px; }
#tasks form {
  display: grid;
  grid-template-columns: 10% 60% 20% 10%;
  padding: 10px;
  background: #f7f7f7;
  border: 1px solid #ccc;
  margin-bottom: 10px;
}
#tasks input, #tasks select {
  padding: 10px;
  cursor: pointer;
  border: 0;
}
#tasks input[type=button], #tasks input[type=submit] { color: #fff; }
#tasks input[type=button] { background: #a72020; }
#tasks input[type=submit] { background: #577ed8; }
#taskadd { grid-column: span 2; }

## 3c-todo.js
function deltask (id) { if (confirm("Delete task?")) {
  document.getElementById("ninID").value = id;
  document.getElementById("ninForm").submit();
}}
	CREATE TABLE `todo` (
	`todo_id` bigint(20) NOT NULL,
	`todo_task` text NOT NULL,
	`todo_status` tinyint(1) NOT NULL DEFAULT 0
	) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

	ALTER TABLE `todo`
	ADD PRIMARY KEY (`todo_id`);

	ALTER TABLE `todo`
	MODIFY `todo_id` bigint(20) NOT NULL AUTO_INCREMENT;
	<?php
	class ToDo {
	// (A) CONSTRUCTOR - CONNECT TO DATABASE
	private $pdo = null;
	private $stmt = null;
	public $error = "";
	function __construct () {
	$this->pdo = new PDO(
	"mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
	DB_USER, DB_PASSWORD, [
	PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
	PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
	]);
	}

	// (B) DESTRUCTOR - CLOSE DATABASE CONNECTION
	function __destruct () {
	if ($this->stmt!==null) { $this->stmt = null; }
	if ($this->pdo!==null) { $this->pdo = null; }
	}

	// (C) HELPER - RUN SQL QUERY
	function query ($sql, $data=null) : void {
	$this->stmt = $this->pdo->prepare($sql);
	$this->stmt->execute($data);
	}

	// (D) SAVE TO-DO TASK
	function save ($task, $status, $id=null) {
	if ($id===null) {
	$sql = "INSERT INTO `todo` (`todo_task`, `todo_status`) VALUES (?,?)";
	$data = [$task, $status];
	} else {
	$sql = "UPDATE `todo` SET `todo_task`=?, `todo_status`=? WHERE `todo_id`=?";
	$data = [$task, $status, $id];
	}
	$this->query($sql, $data);
	return true;
	}

	// (E) GET ALL TASKS
	function getAll () {
	$this->query("SELECT * FROM `todo`");
	return $this->stmt->fetchAll();
	}

	// (F) DELETE TASK
	function del ($id) {
	$this->query("DELETE FROM `todo` WHERE `todo_id`=?", [$id]);
	return true;
	}
	}

	// (G) DATABASE SETTINGS - CHANGE TO YOUR OWN!
	define("DB_HOST", "localhost");
	define("DB_NAME", "test");
	define("DB_CHARSET", "utf8mb4");
	define("DB_USER", "root");
	define("DB_PASSWORD", "");

	// (H) NEW TO-DO OBJECT
	$TODO = new ToDo();
	<!DOCTYPE html>
	<html>
	<head>
	<title>Simple To Do List</title>
	<meta charset="utf-8">
	<link rel="stylesheet" href="3b-todo.css">
	<script src="3c-todo.js"></script>
	</head>
	<body>
	<?php
	// (A) ADD/UPDATE/DELETE TASK IF FORM SUBMITTED
	require "2-todo-lib.php";
	if (isset($_POST["action"])) {
	// (A1) SAVE TASK
	if ($_POST["action"]=="save") {
	$pass = $TODO->save($_POST["task"], $_POST["status"], (isset($_POST["id"])?$_POST["id"]:null));
	}

	// (A2) DELETE TASK
	else { $pass = $TODO->del($_POST["id"]); }

	// (A3) SHOW RESULT
	echo "<div class='notify'>";
	echo $pass ? "OK" : $TODO->error ;
	echo "</div>";
	}
	?>

	<!-- (B) NINJA DELETE FORM -->
	<form id="ninForm" method="post">
	<input type="hidden" name="action" value="del">
	<input type="hidden" name="id" id="ninID">
	</form>

	<div id="tasks">
	<!-- (C) ADD NEW TASK -->
	<form method="post">
	<input type="hidden" name="action" value="save">
	<input type="text" id="taskadd" name="task" placeholder="Task" required>
	<select name="status">
	<option value="0">Pending</option>
	<option value="1">Done</option>
	<option value="2">Canceled</option>
	</select>
	<input type="submit" value="Add">
	</form>

	<!-- (D) LIST TASKS -->
	<?php
	$tasks = $TODO->getAll();
	if (count($tasks)!=0) { foreach ($tasks as $t) { ?>
	<form method="post">
	<input type="button" value="X" onclick="deltask(<?=$t["todo_id"]?>)">
	<input type="hidden" name="action" value="save">
	<input type="hidden" name="id" value="<?=$t["todo_id"]?>">
	<input type="text" name="task" placeholder="Task" value="<?=$t["todo_task"]?>">
	<select name="status">
	<option value="0"<?=$t["todo_status"]==0?" selected":""?>>Pending</option>
	<option value="1"<?=$t["todo_status"]==1?" selected":""?>>Done</option>
	<option value="2"<?=$t["todo_status"]==2?" selected":""?>>Canceled</option>
	</select>
	<input type="submit" value="Save">
	</form>
	<?php }} ?>
	</div>
	</body>
	</html>
	* {
	font-family: Arial, Helvetica, sans-serif;
	box-sizing: border-box;
	}
	.notify {
	background: #ecefff;
	border: 1px solid #bfc4ff;
	padding: 5px;
	margin-bottom: 10px;
	}
	#tasks { max-width: 500px; }
	#tasks form {
	display: grid;
	grid-template-columns: 10% 60% 20% 10%;
	padding: 10px;
	background: #f7f7f7;
	border: 1px solid #ccc;
	margin-bottom: 10px;
	}
	#tasks input, #tasks select {
	padding: 10px;
	cursor: pointer;
	border: 0;
	}
	#tasks input[type=button], #tasks input[type=submit] { color: #fff; }
	#tasks input[type=button] { background: #a72020; }
	#tasks input[type=submit] { background: #577ed8; }
	#taskadd { grid-column: span 2; }
	function deltask (id) { if (confirm("Delete task?")) {
	document.getElementById("ninID").value = id;
	document.getElementById("ninForm").submit();
	}}