throw.notSupported

Code example

<?php declare(strict_types = 1);

function doFoo(bool $condition): string
{
    $value = $condition ? 'hello' : throw new \Exception('Not valid');
}

Why is it reported?

Throw expressions (using throw as an expression rather than a statement) were introduced in PHP 8.0. In earlier versions of PHP, throw can only be used as a standalone statement. Using throw inside a ternary expression, null coalescing operator, or short closure is a syntax error on PHP versions before 8.0.

This error is reported when PHPStan is configured to analyse code for a PHP version that does not support throw expressions.

How to fix it

If the project requires compatibility with PHP versions before 8.0, rewrite the code to use throw as a statement:

 <?php declare(strict_types = 1);

 function doFoo(bool $condition): string
 {
-    $value = $condition ? 'hello' : throw new \Exception('Not valid');
+    if (!$condition) {
+        throw new \Exception('Not valid');
+    }
+    $value = 'hello';
 }