signup in oops

_templates/_signup.php

@@ -6,7 +6,7 @@ if (isset($_POST['username']) and isset($_POST['password']) and !empty($_POST['p
     $password = $_POST['password'];
     $email = $_POST['email_address'];
     $phone = $_POST['phone'];
-    $error = signup($username, $password, $email, $phone);
+    $error = User::signup($username, $password, $email, $phone);
     $signup = true;
 }
 ?>

libs/includes/Database.class.php

+<?php
+
+class Database
+{
+    public static $conn = null;
+    public static function getConnection()
+    {
+        if (Database::$conn == null) {
+            $servername = "mysql.selfmade.ninja";
+            $username = "sibidharan";
+            $password = "xyjxo8-xefjat-gYnsif";
+            $dbname = "sibidharan_newdb";
+        
+            // Create connection
+            $connection = new mysqli($servername, $username, $password, $dbname);
+            // Check connection
+            if ($connection->connect_error) {
+                die("Connection failed: " . $connection->connect_error); //TODO: Replace this with exception handling
+            } else {
+                printf("New connection establishing...");
+                Database::$conn = $connection; //replacing null with actual connection
+                return Database::$conn;
+            }
+        } else {
+            printf("Returning existing establishing...");
+            return Database::$conn;
+        }
+    }
+}

libs/includes/Mic.class.php

@@ -16,11 +16,18 @@ class Mic
     public $model;
     private $light;
     public $price;
+    public static $test;
+
+    public static function testFunction()
+    {
+        printf("This is a static function, this can be run without object initialization. ");
+    }
 
     public function __construct($brand)
     {
         printf("Constructing object...");
         $this->brand = ucwords($brand);
+        Mic::testFunction();
     }
 
     public function setLight($light)
@@ -52,4 +59,22 @@ class Mic
     {
         return $this->getModel();
     }
+
+    public function __destruct()
+    {
+        printf("Destruct object: brand: $this->brand...");
+    }
+}
+
+class DupMic
+{
+    public static function testFunction()
+    {
+        return "hello";
+    }
+}
+
+function testFunction()
+{
+    printf("This is a static function, this can be run without object initialization.");
 }

libs/includes/User.class.php

+<?php
+
+class User
+{
+    public static function signup($user, $pass, $email, $phone)
+    {
+        $conn = Database::getConnection();
+        $sql = "INSERT INTO `auth` (`username`, `password`, `email`, `phone`, `active`)
+        VALUES ('$user', '$pass', '$email', '$phone', '1');";
+        $error = false;
+        if ($conn->query($sql) === true) {
+            $error = false;
+        } else {
+            // echo "Error: " . $sql . "<br>" . $conn->error;
+            $error = $conn->error;
+        }
+    
+        // $conn->close();
+        return $error;
+    }
+}

libs/load.php

 <?php
 
 include_once 'includes/Mic.class.php';
+include_once 'includes/Database.class.php';
 
 function load_template($name)
 {
@@ -15,31 +16,3 @@ function validate_credentials($username, $password)
         return false;
     }
 }
-
-function signup($user, $pass, $email, $phone)
-{
-    $servername = "mysql.selfmade.ninja";
-    $username = "sibidharan";
-    $password = "xyjxo8-xefjat-gYnsif";
-    $dbname = "sibidharan_newdb";
-
-    // Create connection
-    $conn = new mysqli($servername, $username, $password, $dbname);
-    // Check connection
-    if ($conn->connect_error) {
-        die("Connection failed: " . $conn->connect_error);
-    }
-
-    $sql = "INSERT INTO `auth` (`username`, `password`, `email`, `phone`, `active`)
-    VALUES ('$user', '$pass', '$email', '$phone', '1');";
-    $error = false;
-    if ($conn->query($sql) === true) {
-        $error = false;
-    } else {
-        // echo "Error: " . $sql . "<br>" . $conn->error;
-        $error = $conn->error;
-    }
-
-    $conn->close();
-    return $error;
-}

test.php

@@ -25,6 +25,8 @@ include 'libs/load.php';
 $mic1 = new Mic("Roda"); //constructing the object
 $mic2 = new Mic("HyperX"); //constructing the object
 
+Mic::testFunction(); //no construction, no destruction.
+testFunction();
 
 $mic1->setLight("White");
 $mic2->setLight("Green");
@@ -36,5 +38,16 @@ print("\n".$mic1->getBrand());
 print("\n".$mic2->getBrand());
 
 print("Value of 10+12 is ".$mic1->add(10, 12));
+print("This is mono font inside pre tag \n");
+
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+$conn = Database::getConnection();
+
 ?>
-</pre>
\ No newline at end of file
+</pre>
+This is regular font.
\ No newline at end of file