Error Identifier: ternary.resultUnused

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

function doFoo(bool $a, string $b, string $s): void
{
	$a ? $b : $s;
}

Why is it reported? #

A ternary expression is used as a standalone statement, but its result is not assigned to a variable, returned, or passed as an argument. The expression evaluates to a value that is immediately discarded, which means it has no effect on the program.

This usually indicates one of the following:

The result was meant to be assigned to a variable or returned.
The intent was to use an if/else statement for side effects instead.

How to fix it #

Assign the result to a variable or return it:

-$a ? $b : $s;
+$result = $a ? $b : $s;

Or use an if/else statement if the branches have side effects:

-$a ? doSomething() : doSomethingElse();
+if ($a) {
+	doSomething();
+} else {
+	doSomethingElse();
+}

How to ignore this error #

You can use the identifier ternary.resultUnused to ignore this error using a comment:

// @phpstan-ignore ternary.resultUnused
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: ternary.resultUnused

Rules that report this error #

PHPStan\Rules\DeadCode\NoopRule [1]

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