PHP: Một số câu hỏi khi phỏng vấn

1. See the following commands:

$a = "V1";
$a[10] = "Study";

What is result if you run this command:

echo $a;

2. How to get the different between 2 dateparts?

3. What is the output of those statements:

$a='a';
$b=$$a;
echo $b; //a

4. What is the output of those statements:

$a='V1';
$b=&$a;
echo $b; //V1

5. What is the output of those statements:

$a='V1';
$b=$$a;
echo $b; //Error

6. How to implement a package in Laravel?

7. What caching does Laravel use?

8. How to enable a long query in Laravel?

9. Do you know Git and Github?

10. Do you know Source Version Control?

11. Do you know about RESTful API?

12. Is the following query True or False:
Select * from Product where 1=?

13. What is the difference between the slice() function and the splice() function?