CODEWITHSUNDEEP
phpnull-coalescing-operator
Robert Brax
Robert Brax

Reputation: 7318

Null Coalesce Operator with a null last operand

It works fine and doesn't cause problem

echo $formErrorBag[ 'email' ] ?? null

But is it an accepted practice? Never saw an example of this used with null.

Upvotes: 2

Views: 208

Answers (2)

Xorifelse
Xorifelse

Reputation: 7911

The null coalesce operator checks values with isset(), so this: 

echo $formErrorBag['email'] ?? null;

Equals:

if(isset($formErrorBag['email'])){
  echo $formErrorBag['email'];
} else {
  echo null;
}

I really don't see the point in that as you are still executing a function doing literally nothing. If you are doing this to avoid raising an E_NOTICE you can simply turn it off with error_reporting() as doing your method kinda breaks the entire point of that.

It's there to warn you about a possible bug in your code, not finding techniques to suppress it.

error_reporting(error_reporting() ^ E_NOTICE); // turn notices off keep remaining flags intact.

echo $array['doesnotexist'];
echo $array['etc'];

error_reporting(error_reporting() | E_NOTICE); // turn it back on.

Upvotes: 1

Mureinik
Mureinik

Reputation: 311188

It's completely legal, and accepted. It's a pretty easy and elegant way to avoid raising an E_NOTICE if $formErrorBag doesn't have an 'email' key.

Upvotes: 7

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