Question

I’m making a form validation class and it works like this currently.

$validator->setVar($_POST['Username'])
          ->standardFilter(array('XSS', 'SQL_INJECTION'))
          ->customRegex()
          ->replace('This', 'With this')
          ->getResult();

While it works perfectly when chained like this, I can’t archieve the following result.

$validator->setVar($_POST['Username'])
          ->isValidEmail()
          ->isValidPhoneNumber()
          ->isSet()
          ->isNull()
          ->getResult()

For example, script returns the following values

->isValidEmail() (true)
->isValidPhoneNumber() (true)
->isSet() (false)

Basically, I’m going to make an array, fill it with true/false depending on the result of each function, and I’ll look for a specific value in array (a false). If it exists, the class will return false regardless of the rest of the chains. (or I can just override variables, not important here.)

However, I want $validator to stop chaining once it gets a false from a function. Let’s say it received a false from isSet(). It shouldn’t execute isNull() and getResult() since we already have a failed check.

How can I archieve this in PHP?

TL;DR:

var_dump($validator->setVar('Test message')->isInteger()->setTrue());
                                             //false     //true

Output: false, because once isInteger() failed, rest of the chain isn't executed.

How can I archieve this in PHP?

Answer 1

Try something like this

class FooBar
{
  private $SomethingWrong = false;

  function Bar()
  {
    if( $this->SomethingWrong )
      throw new Exception('SomeThing is wrong');
    return $this;
  }

  function Foo()
  {
    return $this
  }
}

$foobar = new FooBar();
$foobar->Bar()
       ->Foo();

The Foo() part will not be executed, because of the exception in the Bar().

Of course, there are some variations. If you do not want a exception, but a silent non-execute, you could try this:

class FooBar
{
  private $SomethingWrong = false;

  function Bar()
  {
    $this->SomethingWrong = true;
    return $this;
  }

  function Foo()
  {
    if( !$this->SomethingWrong )  {
      // do my stuff
    }
    return $this
  }
}