Warning: number_format() expects parameter 1 to be double

Posted on 2014-03-15
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 110

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 110

Accepted Solution

Ray Paseur earned 500 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;
Salesforce Made Easy to Use

On-screen guidance at the moment of need enables you & your employees to focus on the core, you can now boost your adoption rates swiftly and simply with one easy tool.

LVL 110

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 110

Expert Comment

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

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Export Data from MySql Using PHP 16 67
Form submit takes only for one form 23 54
How to open a new browser tab after executing php script 20 49
Format Date 7 28
This article discusses four methods for overlaying images in a container on a web page
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 dynamically set the form action using jQuery.
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

751 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