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<?php function testOptional(string $hello, string|null $world = null) { return $hello . ' ' . ($world ?? 'world'); } function testNullable(string $hello, string|null $world) { return $hello . ' ' . ($world ?? 'world'); } echo testOptional('hello'), PHP_EOL; echo testNullable('hello'), PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
hello world Fatal error: Uncaught ArgumentCountError: Too few arguments to function testNullable(), 1 passed in /in/gXLDH on line 14 and exactly 2 expected in /in/gXLDH:8 Stack trace: #0 /in/gXLDH(14): testNullable('hello') #1 {main} thrown in /in/gXLDH on line 8
Process exited with code 255.

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