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📜  错误:在 null 上调用成员函数 first() - 无论代码示例

📅  最后修改于: 2022-03-11 14:58:13.508000             🧑  作者: Mango

代码示例1
//That simply means that you want to retrieve value that does not exist. 
//You can make simple condition like that:

if(is_null($this->sort)){
    return "-";
}