Getting Can't use function return value in write context [duplicate]

Question

I get the error in the subject. Also I spent ages on google and found dozens of resources having the same error, but still I can't figure out what the issue is. This is my code:

<?php
if(empty(trim($_POST["user"])) || empty(trim($_POST["text"]))) {
    echo "no luck";
  }
?>

PHP Fatal error: Can't use function return value in write context in /var/www/test.php on on line 2

Depending on PHP version empty() expects a variable reference, not an expression / function result. Use !strlen alternatively. — mario
– mario, Commented May 7, 2016 at 10:02

u_mulder · Accepted Answer · 2016-05-07 10:05:06Z

1

If you refer to a manual, you will see

Determine whether a variable is considered to be empty.

The result of trim passed to empty is not a variable.

So your options are:

$user = trim($_POST['user']);
if (!empty($user)) {   }

Or php5.5, in which

empty() now supports expressions

answered May 7, 2016 at 10:05

u_mulder

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