関連ワード:  a void function may not return a value    a void function must not return a value    a void function does not return a value    a void function must not return a value laravel    a void method must not return a value    php a void function must not return a value    void function should not return a value    non void function does not return a value in all control paths    non void function does not return a value    non void function does not return a value - wreturn type  
結果 : a void function may not return a value