报错 Fatal error: Cannot declare function Demo2\test because the name is already in use in

Question

The same code as the teacher, error:

Fatal error: Cannot declare function Demo2\test because the name is already in use in E:\wwwroot\phpbase\object\namespace\test2.php on line 5

test1 code:

<?php

namespace Demo1;

function test($a,$b)

{

return $a*$b;

}

?>

test2 code:

<?php

namespace Demo2;

require('test1.php');

use function Demo1\test;

function test($a,$b)

{

return $a $b%

Answer 1

You are very studious, big brother!

Answer 2

I do not know

Answer 3

The final result is 9

Answer 4

test2.php file

Answer 5

test1.php file

Answer 6

test1.php and test2.php are placed in different Demo1 and Demo2 folders

Answer 7

use function Demo1\test; Just remove this line

Answer 8

The teacher's code is to solve this kind of duplication of names. His demonstration is not wrong, but if we use the same code, we will be wrong.

Answer 9

test2 itself has a test method, and then the test1 you introduced also has a test method

If the same method exists in the same .php, you will get the error above

http://php.wyscdz .com

Answer 10

The above error is that the PHP version is 7.0.12

If you switch back to 5.6.27, the following error will be reported:

Fatal error: Call to undefined function Demo1\test()