PHP Variable into a number

Posted on 2016-10-15
Last Modified: 2016-11-07
I'm having an issue with Less Than.  I am turning a variable into a number and evaluating it.
$percent = get_post_meta ($dt_grade_post_id, "marks-obtained-percent", true);
                                            $per = (int)$percent;
                                            if($per <= 89) {

								$user_option_alt = '<a href="'.get_permalink($quiz_id).'" class="dt-sc-button small">'.__('Retake Quiz', 'dt_themes').'</a>';

Open in new window

in my code $percent  = 90.  No matter what it always passes the valuation.  Wjhat am I doing wrong?
Question by:rgranlund
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
LVL 35

Expert Comment

by:Terry Woods
ID: 41845324
Try adding some debugging and see what you get:
$percent = get_post_meta ($dt_grade_post_id, "marks-obtained-percent", true);
                                            $per = (int)$percent;
die("percent: '$percent', per: '$per'");  # add this line
                                            if($per <= 89) {

Open in new window

LVL 57

Accepted Solution

Julian Hansen earned 500 total points
ID: 41845402
I replicated your code here works as expected.

wp_postmeta record
define('WP_USE_THEMES', false);

$dt_grade_post_id = 999;
$percent = get_post_meta ($dt_grade_post_id, "marks-obtained-percent", true);
$per = (int)$percent;
$user_option_alt = '';
if($per <= 89) {
  $user_option_alt = '<a href="'.get_permalink($quiz_id).'" class="dt-sc-button small">'.__('Retake Quiz', 'dt_themes').'</a>';
echo "Result: [{$user_option_alt}]<br/>";

Open in new window

Problem is somewhere else.
LVL 110

Expert Comment

by:Ray Paseur
ID: 41845429
Var_export() is your friend.  So is the error_log().  You can use these functions together.  They will let you capture a "moment in time" representation of the contents of your variables, and write that information into a log file that you can inspect after the fact.  You might use something like this:
$xxx = var_export($percent, TRUE);

Open in new window

But that said, one usual range of percentages is from 0 to 100, which translates to a two-digit decimal fraction expressing a value between 0.00 and 1.00.  When you cast these fractional values to integers, you may get unexpected results.

Here's how I would handle the issue...

1. Insert the data visualization code and check the error log to be sure you're working with the correct numeric values.
2. Run this little script to see how (int) casting works, then consider whether you want to use casting or the more mainstream approach of round().  Or if you're preparing a number for visual display, number_format() is often useful.
<?php // demo/temp_rgranlund.php

$questions = 100;
$correct   = 89.999;
$percent   = ($correct / $questions) * 100;
$integer   = (int)$percent;

echo PHP_EOL . "PERCENT $percent IS CAST TO INTEGER $integer";

Open in new window


Open in new window


Featured Post

Secure Your WordPress Site: 5 Essential Approaches

WordPress is the web's most popular CMS, but its dominance also makes it a target for attackers. Our eBook will show you how to:

Prevent costly exploits of core and plugin vulnerabilities
Repel automated attacks
Lock down your dashboard, secure your code, and protect your users

Question has a verified solution.

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

Deprecated and Headed for the Dustbin By now, you have probably heard that some PHP features, while convenient, can also cause PHP security problems.  This article discusses one of those, called register_globals.  It is a thing you do not want.  …
Part of the Global Positioning System A geocode ( is the major subset of a GPS coordinate (, the other parts being the altitude and t…
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…
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 …

729 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