Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Fatal error: Can't use function return value in write context

Posted on 2014-09-26
6
Medium Priority
?
984 Views
Last Modified: 2014-09-26
Hi Experts,

Why do I keep getting:
Fatal error: Can't use function return value in write context

...when I:
   if(isset($_POST["email"]) || !empty(trim($_POST["email"])))
   {
       $strEmail = $_POST["email"];
   }
   else 
   {
       $err = 1;
   }

Open in new window


Thank you.
0
Comment
Question by:APD_Toronto
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 58

Expert Comment

by:Gary
ID: 40346657
if(isset($_POST["email"]) && !empty(trim($_POST["email"])))
0
 

Author Comment

by:APD_Toronto
ID: 40346664
makes logical sense - thanks, but same error
0
 
LVL 58

Expert Comment

by:Gary
ID: 40346668
What is the whole function
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 

Author Comment

by:APD_Toronto
ID: 40346673
nothing too complex... The error is at Li.40

<?php

    $submit = '';
    $err = 0;
   
    $strName = '';
    $strEmail = '';
    $strSelect = '';
    $strMessage = '';
   
    
    if(isset($_GET["submit"]))
    {
        $submit = $_GET["submit"];
    }
 
    if($submit == '')
    {
        displayForm();
    }
    else 
    {
        validate();
    }

function validate()
{    
   global $err;
   
   global $strName;
   global $strEmail;
   global $strSelect;
   global $strMessage;
   
   if(isset($_POST["name"]))
   {
       $strName = $_POST["name"];
   }
   
   if(isset($_POST["email"]) && !empty(trim($_POST["email"])))
   {
       $strEmail = $_POST["email"];
   }
   else 
   {
       $err = 1;
   }
   
   if(isset($_POST["selection"]))
   {
       $strSelect = $_POST["selection"];
   }
   else
   { 
       $err = 1;
   }
   
   if(isset($_POST["message"]) && !empty(trim($_POST["message"])))
   {
       $strMessage = $_POST["message"];
   }
   else 
   {
       $err = 1;
   }
   
   if($err = 1)
   {
       displayForm();       
   }
   else
   {
       sendEmail();
   }    
}

Open in new window

0
 
LVL 8

Accepted Solution

by:
Ahmed Merghani earned 2000 total points
ID: 40346674
Your code should be changed to something like this:
if(isset($_POST["email"]) && (trim($_POST["email"]) != false))
   {
       $strEmail = $_POST["email"];
   }
   else 
   {
       $err = 1;
   }

Open in new window

Prior to PHP 5.5, empty() only supports variables; anything else will result in a parse error. In other words, the following will not work: empty(trim($name)). Instead, use trim($name) == false.
See this link:
http://us3.php.net/manual/en/function.empty.php
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 40346678
As a general rule, compound statements with multiple function calls in the same line of code are a path to confusion.  I believe this statement is causing the problem:

empty(trim($_POST["email"]))

Try something more like this:

$email = trim($_POST['email']);
if (empty($email)) /* DO SOMETHING */

Long ago, PHP allowed this sort of thing, but it's not allowed any more.  That's one of the risks of getting old bits of code from the internet - you don't really know if it works.  Maybe it used to work and doesn't any more.
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Developers of all skill levels should learn to use current best practices when developing websites. However many developers, new and old, fall into the trap of using deprecated features because this is what so many tutorials and books tell them to u…
3 proven steps to speed up Magento powered sites. The article focus is on optimizing time to first byte (TTFB), full page caching and configuring server for optimal performance.
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The viewer will learn how to dynamically set the form action using jQuery.

670 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question