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public function testSanYuan()
{
$d = '12331';
$e = 0;
$a = $b ?? $c ?? $d;
$f = $e ?: $d;
dd($a, $f);
}
public function testSanYuan()
{
$d = '12331';
$e = 0;
$a = $b ?? $c ?? $d;
$f = $e ?: $d;
dd($a, $f);
}