How to check if a object has a static variable defined?

PHP: How to check if a object has a static variable defined?

If you have an object and you need to check if it has a const SOME_CONSTANT = 'foo' set, then you can use defined in the following way:

  1.         class ExampleClass {
  2.             const CONST_THAT_DOES_EXIST = 9;
  3.  
  4.             function does_it_have_const() {
  5.             // late static binding:
  6.                 var_dump( defined('static::CONST_THAT_DOES_EXIST') );
  7.                 var_dump( defined('static::CONST_THAT_DOES_NOT_EXIST') );
  8.  
  9.                 // or use self
  10.                 var_dump( defined('self::CONST_THAT_DOES_EXIST') );
  11.             }
  12.  
  13.         }

webdevetc profile pic
webdevetc

I am a 29 year old backend web developer from London, mostly focusing on PHP and Laravel lately. This (webdevetc.com) is my blog where I write about some web development topics (PHP, Laravel, Javascript, and some server stuff). contact me here.



More...


Comments and discussion about How to check if a object has a static variable defined?

Found this interesting? Maybe you want to read some more in this series?

Or see other topics in the PHP language

Or see other languages/frameworks:
PHP Laravel Composer Apache CentOS and Linux Stuff WordPress General Webdev and Programming Stuff JavaScript
Or see random questions

How to see all of the options for an artisan command?

PHP Date commonly used formats

What is Agile software development?

How do Invokable Controllers work in Laravel?

What kind of database field type should you (normally) use for foreign keys?

What are the predefined variables in PHP?

What is the difference between integration and unit tests?

How to return an item in Eloquent, or throw a ModelNotFoundException exception if it isn't found?

How to get the first row that matches some where queries, or create it if it doesn't exist (in Laravel's Eloquent)?

How to review blog posts (written by other users) before they get published on your WordPress blog?