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<?php $foo = null; var_dump($foo ?? 'bar', $foo ?: 'bar', $foo ?? 'bar' ?: 'baz'); $foo = false; var_dump($foo ?? 'bar', $foo ?: 'bar', $foo ?? 'bar' ?: 'baz');
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "bar" string(3) "bar" string(3) "bar" bool(false) string(3) "bar" string(3) "baz"

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