PHP Call empty appears error can ' t use function return value in write context

PHP Call empty appears error can ' t use function return value in write context

2012-10-28 09:33:22 | 11,391 Reads | comments:0 Article | itokit

A simple procedure for today:

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1. protected function _islogin () {
2. if (Empty (Cookie (C (' itokit_com ') ))) {
3. $this->error (' not logged in backstage, please log in first ', ' public/login ');
4. }
5. }

Run this method to return the following error:
Can ' t use function return value in write context E:\www\www.itokit.com\js\Lib\Action\Jsadmin\CommonAction.class.php 16th Yes.

The reason for this error is that the empty function argument must be variable and cannot be the return value of other functions, including Str_replace,trim, etc.
And my empty uses a function that the cookie has a return value. So the mistake was reported.
OK, know the cause of the error, modified can be:

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1. Protected function _islogin () {
2. $itokitname = Cookie (C (' jsadmin_user '));
3. if (emptyempty ($itokitname)) {
4. $this->error (' not logged in backstage, please log in first ', ' public/login ');
5. }
6. }

Well, the problem is solved. How do you encounter a small problem like me, you can get the variable first, and then use empty oh.

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PHP Call empty appears error can ' t use function return value in write context