PHP Empty Error

"Error Details": Fatal error:can ' t use function return value in the write context in ....

"Error Pass": Look at a program like this.

[PHP] View plain copy print?

$value = $_post[' username '); if (Empty (Trim ($value))) {Echoerror (' Please enter user name! ');}

At first glance, it seems very simple, no problem, can be determined after the exception is this small program appears above the fatal error~, so first doubt the custom method Echoerror implementation of what problems, can be after the problem is not out here, very puzzled, Finally, a query manual found that the empty () method at the end of a small paragraph explanation:

Note: empty () detects only variables and detects anything that is non-variable will result in parsing errors. In other words, the statement behind will not work: Empty (Addslashes ($name)).

Understand ~ Program Structure changes:

[PHP] View plain copy print?

$value = Trim ($_post[' username '); if (empty ($value)) {echoerror (' Please enter user name! ');}

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