CODEWITHSUNDEEP
phpoop
Amit Singh
Amit Singh

Reputation: 2275

Property declaration PHP

I have a page with the following class:

class SimpleClass
{
   public $var6 = myConstant;
   public $var7 = array(true, false);
}

And I ran the page on browser. It throws no errors/warning/notice.

But then I created an object like:

$newvar = new SimpleClass;
echo $newvar->var6;

And it gives me "Notice: Use of undefined constant myConstant". I know myConstant needs to be defined to be accessed, which has not been.

My question is why am I getting this Notice message only after object creation and not before?

Upvotes: 0

Views: 63

Answers (2)

Prafulla Kumar Sahu
Prafulla Kumar Sahu

Reputation: 9693

here when you are trying to retrieve the $var6, It is assuming it like public $var6 = 56; //any constant .

read about how to declare constant , if you want constant there. Or use quote , so that it will treat it as string.

string

<?php
class SimpleClass
{
   public $var6 = 'myConstant';
   public $var7 = array(true, false);
}

$newvar = new SimpleClass;
echo $newvar->var6;

constant

class MyClass
{
    const CONSTANT = 'constant value';
}

echo MyClass::CONSTANT . "\n";

Upvotes: 0

Darren
Darren

Reputation: 13128

You're getting the error because you're instantiating the class in the second example.

$newvar = new SimpleClass();

This throws the error as it tries to "compile" it, thus trying to harness myConstant within the global namespace, hence the error (as it isn't defined).

If you don't call the class, you wouldn't have the error throwing as it isn't in use.

Clarification on your comment here:

You only get the error message due to the fact that you instantiated the class. If you didn't do that, the error wouldn't show. This is correct practice and exactly how PHP functions.

Upvotes: 1

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