CODEWITHSUNDEEP
phpformsooppost
Георги Димитров
Георги Димитров

Reputation: 26

OOP PHP - GET the form post

Hello I'm watching a tutorial about OOP PHP "How to make login form". And I can't understand how the form post was gotten from this code.

input.php

class input
{
  public static function exists($type = 'post')
  {
    switch ($type)
    {
        case 'post':
            return (!empty($_POST)) ? true : false;
        break;
        case 'get':
            return (!empty($_GET)) ? true : false;
        break;
        default:
            return false;
        break;
    }
  }
}

register.php

if (input::exists())
{
  //the submit button was clicked
}

So I will be happy if someone explain how does that work and how can i specify it to a specific form. Like this.

if ($_POST['specific submit name'])
{
  // the specific submit button was clicked.
}

Upvotes: 1

Views: 731

Answers (1)

dimlucas
dimlucas

Reputation: 5141

This function:

public static function exists($type = 'post')
  {
    switch ($type)
    {
        case 'post':
            return (!empty($_POST)) ? true : false;
        break;
        case 'get':
            return (!empty($_GET)) ? true : false;
        break;
        default:
            return false;
        break;
    }
  }

checks if the $_POST or $_GET superglobal arrays are empty. So let's say that you need to check if a POST requests has reached your page. You call input::exists('post'); That means the first case is true and this part of the code will be executed:

return (!empty($_POST)) ? true : false;

This code returns true if $_POST is not empty, which practically means there's data in it or false if it is empty. Truth be told, this statement could be more easily written like this:

return !empty($_POST);

The if/else logic is pretty reduntant as is most of that code. To check if a particular value is in the $_POST array you can use isset.

So let's say you submit a form or send an AJAX request and one of the fields has a name of 'foo', you can check if 'foo' exists in $_POST like this:

if(isset($_POST['foo'])
{
    //do something with foo
}

As you can see there are simpler ways to check if $_POST is populated and with what values. As I said above I consider the input class and the exists method reduntant code. You could use this tutorial just for learning what OOP is but I wouldn't rely on it

Upvotes: 1

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