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


Warning: number_format() expects parameter 1 to be double

Posted on 2014-03-15
Medium Priority
Last Modified: 2014-03-15
Hi Guys,
Can anyone tell me why I'm getting the following warning? It started happening when I moved to a dedicated server.
I'm running PHP 5.2

"Warning: number_format() expects parameter 1 to be double, string given in /DocumentName.php on line 6"

From this code:
	$credit="SELECT credit FROM $M_TableName WHERE UniqueID= '$UniqueID'";
	$credit=mysql_query($credit)or die(mysql_error());
	$credit=mysql_fetch_array($credit)or die(mysql_error());
	$credit = str_replace('-','', $credit);
 	$credit=number_format($credit, 2, '.', '');

Open in new window

Thanks for the help,
Question by:sasnaktiv
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
  • 4
  • 2
LVL 111

Expert Comment

by:Ray Paseur
ID: 39931458
Please use var_dump($credit) after line 3 and post the output here, thanks.

You may also find that you want to add error_reporting(E_ALL) to the top of your PHP scripts.

Author Comment

ID: 39931473
Hi Ray,
Thanks for the help.


Returns the following:
array(2) { [0]=> string(0) "" ["credit"]=> string(0) "" }

LVL 111

Accepted Solution

Ray Paseur earned 2000 total points
ID: 39931489
So it looks like $credit is an empty string.  But number_format() is expecting numbers, not strings.  If $credit was a zero it could be converted to a floating point number (PHP would do this automatically) and then number_format() should be able to work correctly.

Try this after line 5:

if (empty($credit)) $credit = 0.0;
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.

LVL 111

Expert Comment

by:Ray Paseur
ID: 39931492
You may also want to read this article.  At some point, PHP will eliminate the MySQL extension from the language, and you'll want to be prepared before that happens.  You may also want to upgrade your version of PHP.  PHP 5.2 is no longer supported at all, not even for security fixes!

Author Closing Comment

ID: 39931574
Thanks Ray,
I was successful with something similar, but your approach is more efficient.

if ($credit >'0' || $credit ==''){ $credit = 0.0;}

LVL 111

Expert Comment

by:Ray Paseur
ID: 39931615
Thanks for the points.  The definition of what is empty() is available here:

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Things That Drive Us Nuts Have you noticed the use of the reCaptcha feature at EE and other web sites?  It wants you to read and retype something that looks like this. Insanity!  It's not EE's fault - that's just the way reCaptcha works.  But it i…
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.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

704 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