Is there a way in PHP to use null coalesing/nullsafe operators to default to not set any value?

Question

I only see use cases were null coalesing can be used to chain values, but not to omit any value.

Am I missing something essential or is there really no shorthand way to write this:

$model->name = "Example";

if(isset($input->name)) {
    $validName = $this->doSomeValidationEventualyReturnNull($input->name);
    if($validName) {
        $model->name = $validName;
    }
}

I am having a hard time reading the question title but your code could be shortened to $model->name = $this->doSomeValidationEventualyReturnNull($input->name ?? null) ?? "Example"; — Your Common Sense
– Your Common Sense, Commented May 18, 2022 at 13:34

Onki Hara · Accepted Answer · 2022-05-18 13:49:35Z

2

I can propose this one liner, has something to do with null coalescing.

$model->name = isset($input->name) ? ($this->doSomeValidationEventualyReturnNull($input->name) ?? $model->name) : $model->name;

edited May 18, 2022 at 13:49

answered May 18, 2022 at 13:12

Onki Hara

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5 Comments

Alex Over a year ago

Sorry, maybe I was not precise enough: the first line is just to complete the example. I only need a replacement for the nested if-clauses and leave the model untouched if there is no or invalid input.

Onki Hara Over a year ago

OK, I edited the answer, unfortunately I see no way to avoid the double $model->name in the expression.

Your Common Sense Over a year ago

this code will cause an error if $input->name is not set

Onki Hara Over a year ago

It's throws a warning - you can prevent this by using isset($input->name).

Alex Over a year ago

Thank you for your answer. Although I find it not really easier/more readable than the nested ifs

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