• Javascript Function Return

Empty needs to access the value by reference (in order to check whether that reference points to something that exists), and PHP before 5.5 didn't support references to temporary values returned from functions.However, the real problem you have is that you use empty at all, mistakenly believing that 'empty' value is any different from 'false'.Empty is just an alias for!isset($thing) !$thing. When the thing you're checking always exists (in PHP results of function calls always exist), the empty function is nothing but a negation operator.PHP doesn't have concept of emptyness. Values that evaluate to false are empty, values that evaluate to true are non-empty. It's the same thing. This code: $x = something;if (empty($x)) and this: $x = something;if (!$x) has always the same result, in all cases, for all datatypes (because $x is defined empty is redundant).Return value from the method always exists (even if you don't have return statement, return value exists and contains null). Therefore: if (!empty($r-getError))is logically equivalent to: if ($r-getError).

List of puducherry college of education. Note: This is a very high voted answer with a high visibility, but please note that it promotes bad, unnecessary coding practices! See for the correct way.Note #2: I endorse the suggestions to use. When I wrote this answer three years ago, I merely meant to explain the nature of the error, not necessarily endorse the alternative. The code snippet below is not recommended.It's a limitation of in PHP versions below 5.5.Note: empty only checks variables asanything else will result in a parseerror. In other words, the followingwill not work: empty(trim($name)).You'd have to change to this // Not recommended, just illustrates the issue$err = $r-getError;if (!empty($err)).

The topic ‘Fatal error: Can’t use function return value in write context’ is closed to new replies. Email Subscribers & Newsletters Frequently Asked Questions. Jul 27, 2008  Can't use function return value in write context-huh? PHP Forums on Bytes. Estou recebendo o seguinte erro. Fatal error: Can't use function return value in write context in C:Windowsiwpserverhtdocswordpresswp-contentthemesusagistreamindex.php on line 17.

Just a quick post to help anyone struggling with this error message, as this issue gets raised from time to time on support forums.The reason for the error is usually that you’re attempting to use empty or isset on a function instead of a variable. While it may be obvious that this doesn’t make sense for isset, the same cannot be said for empty. You simply meant to check if the value returned from the function was an empty value; why shouldn’t you be able to do just that?The reason is that empty($foo) is more or less syntactic sugar for isset($foo) && $foo. When written this way you can see that the isset part of the statement doesn’t make sense for functions.

Javascript Function Return

This leaves us with simply the $foo part. The solution is to actually just drop the empty part:Instead of.