Actually it throws an E_NOTICE. Something a fair amount of projects require you to turn off. You know what else throws an E_NOTICE?

    $a = notice_there_are_no_quotes;
    echo $a; // $a gets assigned the string 'notice_there_are_not_quotes'

This is super fun when you attempt to use a constant and misspell it.

    $b = MY_CONSTANTT;
    echo $b; // $b is now the string 'MY_CONSTANTT' instead of whatever the correct MY_CONSTANT was set to.

Which is why in both PHP and JavaScript if you really cared about what you were doing, both of those would be methods that throw errors if misspelled

    let a = new A();
    a.setName('John');
    doSomething(a.getNmea()); // Error

    $a = new A();
    $a->setName('John');
    doSomething($a->getNmea()); // Also error

> Something a fair amount of projects require you to turn off. You know what else throws an E_NOTICE?

That is true only for low quality legacy code. I have always developed with all kinds of errors enabled and converted to exceptions (that means single E_NOTICE terminates the program with exception as it is done in Java).

Modern frameworks like Symfony 3 or Slim use the same approach. If you write a project using Symfony you won't miss a notice.

I think default PHP error handling system is wrong - there should be no warnings or notices, only exceptions. Sadly OOP was not very popular among PHP devs in the beginning.

IIRC PHP3 didn't even have objects

PHP4 introduced objects and is the language people shit on when they say PHP doesn't have real OOP

PHP5 introduced Java-like objects PHP5.3 introduced namespaces

I would imagine your doSomething JS function will fail and produce an error in the logging console because doSomething is probably not expecting to receive an undefined. Unless you've written it to handle that scenario and fail gracefully which is probably a good thing to do anyway.

Your whole example is silly. Stuff like this is why you write your PHP/JS/Python/Ruby code in a tool like WebStorm/PyCharm/RubyMine which does enough code analysis to realise you've made a typo and flag it.