OOP VALIDATON INSERT :->

<?php

	class webapps{

		public $localhost ="localhost";
		public $username = "root";
		public $password = "";
		public $database = "crud";
		public $link;

		public function __construct(){

			$this->link = new mysqli($this->localhost,$this->username,$this->password,$this->database);

			if($this->link){
				echo "connected";
			}else{
				echo "not connected";
			}

		}

		public function insert($data){
			$result = $this->link->query($data);
			if($result){
				throw new exception();
			}
		}

		public function select($data){
			$result = $this->link->query($data);
			if($result){
				return $result;
			}
		}

	}

	if(isset($_POST['submit'])){



		$webapps = new webapps;

		function validation($data){
			$data = trim(strip_tags($data));
			return $data;
		}



		$name = validation($_POST['name']);
		$email = validation($_POST['email']);
		$password = validation($_POST['password']);
		$retype_pass = validation($_POST['retype_pass']);
		$phone = validation($_POST['phone']);
		$date = validation($_POST['date']);


		$error = 0;


		if(!$name){
			$error = $error+1;
		}
		if(!isset($_POST['email']) || filter_var($_POST['email'],FILTER_VALIDATE_EMAIL) == false){
			$error = $error+1;
		}
		if(!isset($_POST['password']) || !preg_match('/@?[A-Z]/',$_POST['password'])){
			$error = $error+1;
		}
		if(!isset($_POST['retype_pass']) || $_POST['password']!==$_POST['retype_pass']){
			$error = $error+1;
		}
		if(!isset($_POST['phone']) || !is_numeric($_POST['phone']) || strlen($_POST['phone'])!=11){
			$error = $error+1;
		}
		if(!isset($_POST['date']) || !preg_match('/^[0-9]{4}-[0-9]{2}-[0-9]{2}$/', $_POST['date'])){
			$error = $error+1;
		}
		if(isset($_POST['gender'])){
			$gender = $_POST['gender'];
		}else{
			$error = $error+1;
		}
		if($_POST['country'] != 0){
			$country = $_POST['country'];
		}else{
			$error = $error+1;
		}
		if(isset($_FILES['image']) && substr($_FILES['image']['name'],-4) == ".jpg"){
			$image = $_FILES['image'];
		}else{
			$error = $error+1;
		}
		if($error !=0){
			echo "error have";
		}else{


			try{
				$webapps = new webapps;
				$data = "Insert into insertdata values('','$name','$email','$password','$phone','$date','$gender','$country','$image')";
				$webapps->insert($data);

			}catch(Exception $e){
				echo "ok";
			}

		}
	}



?>




edit.php



<?php

 	require("link.php");

	if(isset($_GET['edit'])){

		$webapps = new webapps;
		$id = $_GET['edit'];
		$data = "SELECT * from insertdata WHERE id='$id'";
		$data = $webapps->edit($data);
		$view = $data->fetch_object() ?>

        <form method="post" enctype="multipart/form-data">
            <input type="text" name="name" value="<?php echo $view->name ?>"> <br/><br/>
            <input type="text" name="email" value="<?php echo $view->email ?>"> <br/><br/>
            <input type="text" name="password" value="<?php echo $view->password_data ?>"><br/><br/>
            <input type="text" name="phone" value="<?php echo $view->phone ?>"> <br/><br/>
            <input type="date" name="date" value="<?php echo $view->date_data ?>"> <br/><br/>
            Male : <input type="radio" name="gender" <?php if($view->gender == "m"){echo "checked";} ?>>
            Female : <input type="radio" name="gender" <?php if($view->gender == "f"){echo "checked";} ?>><br/><br/>
            <select name="country">
                <option value="0">Select a country</option>
                <?php
					for($ini = 1905;$ini<=2017;$ini++){ ?>

                    	<option value="<?php echo $ini ?>" <?php if($ini==$view->country)

						{ echo "selected"; } ?>><?php echo $ini ?></option>

				<?php	}
				?>
            </select><br/><br/>
            <img src="img/<?php echo $view->image ?>" height="100px" /> <br/><br/>
            <input type="hidden" name="old_name" value="<?php echo $view->image ?>"/>
             <input type="hidden" name="id" value="<?php echo $view->id ?>"/>
            <input type="file" name="new_image" />
            <input type="submit" name="update"/>
        </form>

<?php	}