PHP Empty Function Error Resolution

This article mainly introduces the PHP empty function in the detection of a non variable case of the solution to the error, the need for friends can refer to the

PHP development, when you use empty to check the results of a function returned error: Fatal error:can ' t use function returns value in the write context for example, the following code: The following code: <?php   echo Empty (strlen (' Test ')); Go to the PHP manual to view, where the empty function describes the following text: The code is as follows: Note:empty () only checks variables as anything else would result in a parse Erro R. In other words, the following would not Work:empty (trim ($name)).   Come to the conclusion: empty () Only detect variables, detection of any variables will cause parsing error! Therefore, we can not take empty to directly detect the value returned by the function, the above example solution is as follows: The code is as follows: <?php $length = strlen (' test '); echo Empty ($length);