测试啊啊啊啊啊

// 普通赋值
$v = '1';
$c = $v;
$c = '2';
echo $v, PHP_EOL; // '1'
// 数组也是普通赋值
$arr1 = [1,2,3];
$arr2 = $arr1;
$arr2[1] = 5;
print_r($arr1); // [1, 2, 3]