Feb 13, 2018 - login registration, authentication, dashboard post read and delete

dummy user login credentials

email: nur@gmail.com password: secret
email: mahibur@gmail.com password: secret
email: farhad@gmail.com password: secret
email: majedul@gmail.com password: secret
email: tahmina@gmail.com password: secret

email validation using regular expression

function is_email($email) {
  $pattern = '/.+@.+\..+/';
  return preg_match($pattern, $email);
}

checking whether user authenticate or none

function is_authenticate() {
  return isset($_SESSION['user']);
}

In register check whether email already taken or not

function is_email_taken($email) {
  $user = User::where('email', $email)->first();
  return empty($user) ? false : true;
}

server side form validation with storing old form data

php part

$errors = [];
$old_values = [
  'name' => '',
  'email' => '',
  'password' => '',
];

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  $name = $_POST['name'];
  $email = $_POST['email'];
  $password = $_POST['password'];
  $old_values = [
    'name' => $name,
    'email' => $email,
    'password' => $password,
  ];

  if (strlen($name) < 4) {
    $errors['name'] = "name value can't be less than 4 character";
  }
  if (strlen($password) < 4) {
    $errors['password'] = "password value can't be less than 4 character";
  }
  if (!is_email($email)) {
    $errors['email'] = "please pass a valid email address";
  } else if (is_email_taken($email)) {
    $errors['email'] = "email address already taken";
  }

  if (empty($errors)) {
    $user = new User();
    $user->name = $name;
    $user->email = $email;
    $user->password = password_hash( $password, PASSWORD_BCRYPT);
    $user->save();
    $_SESSION['user'] = $user;
    header('Location: /');
  }
}

html part

<form method="post">
  <div class="form-group">
      <label for="name">Name</label>
      <input value="<?php echo $old_values['name'] ?>" type="text" name="name" id="name" class="form-control">
  </div>
  <?php if (isset($errors['name'])): ?>
    <p class="text-danger"><?php echo $errors['name'] ?></p>
  <?php endif ?>
  
  <div class="form-group">
      <label for="email">Email</label>
      <input value="<?php echo $old_values['email'] ?>" type="text" name="email" id="email" class="form-control">
  </div>
  <?php if (isset($errors['email'])): ?>
    <p class="text-danger"><?php echo $errors['email'] ?></p>
  <?php endif ?>
  <div class="form-group">
      <label for="password">Password</label>
      <input value="<?php echo $old_values['password'] ?>" type="password" name="password" id="password" class="form-control">
  </div>
  <?php if (isset($errors['password'])): ?>
    <p class="text-danger"><?php echo $errors['password'] ?></p>
  <?php endif ?>
  <div class="form-group">
    <p>
      Already have account <a href="/login">Login here</a>
    </p>
    <button class="btn btn-outline-primary" type="submit">Register</button>
  </div>
  
</form>

Fetching first results from a collections

$user = User::find($_SESSION['user']->id);

deleting a entry and redirect back with message

$id = $_GET['id'];
$post = Post::find($id);
$post->delete();
header('location: /dashboard/post?delete=true');

javascript confirm box in deleting

<a onclick="return confirm('Are you sure you want to delete this entry')" href="/dashboard/post/delete?id=<?php echo $post->id ?>" class="btn btn-outline-danger"><i class="fa fa-trash"></i> Delete</a>

========================================

Feb 11, 2018

How to getting all data from eloquent model

Model::all();

How to getting single row from eloquent model

Model::find(id);

relationship

// relation between User and Post Model
// inside User model
public function posts()
{
  return $this->hasMany(Post::class);
}
// inside Post model
public function user () {
  return $this->belongsTo(User::class);
}

getting current directory path in php

__DIR__

About table order when we create and drop table

table order is important
some table will depend on other table so when we create table dependent table will be created first
When we drop table order will be reverse

Making foreign key relationship with illuminate/database schema

$t->integer('post_id')->unsigned();
$t->foreign('post_id')->references('id')->on('posts')->onDelete('cascade');

range function

range function will give a array in between range

range(1, 5) // [1, 2, 3, 4, 5];

random number in php

rand function give us random number in between 2 numbers

rand(10, 15) // it will give a number in between 10 and 15

Parsing url path in php

 $path = parse_url( trim( $_SERVER['REQUEST_URI'], '/' ), PHP_URL_PATH);

how to using faker

to generate fake data we are using faker

Install faker

composer require fzaninotto/faker

use Faker

use Faker\Factory;
$faker = Factory::create();

Carbon date library

Carbon date library has lot of helper function to work with data

Installing Carbon

composer require nesbot/carbon

Using carbon

use Carbon\Carbon
Carbon::now()->format("Y-m-d H:i:s")

using carbon method with created_at field

$post->created_at->diffForHumans()

polodev/caryard