Fix: Tainted canvases may not be exported.

The other day, I came across a frustrating CORS-related error while developing a Facebook Instant Game. This is a short post on how I fixed it.

JavaScript: Add image to canvas.

This is a short guide on how to add an image to a canvas element using JavaScript.

JavaScript: How to get the day of the week.

In this guide, we show you how to get the day of the week using JavaScript. We also provide you with a custom function that you can copy.

Calculating the date of Easter with PHP.

This is a short PHP tutorial on how to calculate what date Easter falls on for a given year.

How to create a ZIP file using PHP.

In this guide, I will show you how to create a ZIP file using PHP.

PHP: Force PDF file to download.

This is a short guide on how to force a PDF file to download using PHP.

Receiving XML via POST in PHP.

In this tutorial, I will show you how to receive an XML string via raw post data using PHP.

JavaScript: Check if object property exists.

This is a short JavaScript tutorial on how to check if a given object property exists.

Check if a variable is a JavaScript object.

This is a short guide on how to check if a variable or value if an object using JavaScript.

Tutorial: Change a DIV’s text using JQuery.

This is a short tutorial on how to change the text of a DIV element using the JavaScript JQuery library.

How to handle an array of PHP objects.

This is a short guide on how to work with a PHP array that contains objects.

MyISAM locking explained.

The other day, some of our users reported that saving data had become extremely slow. In some cases, forms were taking up to 15 seconds to submit.

Printing out JSON with PHP.

In this beginner’s tutorial, I will show you how to print out JSON using PHP and specify the correct Content-Type header.

Fix: Unexpected token o in JSON.

A short guide that I wrote on fixing the dreaded “Unexpected token o in JSON” error.

PHP: Following redirects with cURL.

This is a short guide on how to force PHP’s cURL functions to follow a HTTP redirect.

Using PHP with Radio Buttons.

This is a beginner’s tutorial on how to use the Radio Button HTML element with PHP.

PHP: Get visitor country via Cloudflare CF-IPCountry header.

This is a PHP tutorial on how to retrieve a visitor’s country code from Cloudflare’s CF-IPCountry header.

PHP: Using cURL with Basic HTTP Authentication.

This is a short PHP tutorial on how to use cURL to make a Basic Access Authentication request.

PHP: Get the correct IP address from a Cloudflare request.

This article shows you how to the get the user’s IP address from a Cloudflare request using PHP.

Preventing X-Forwarded-For spoofing in HAProxy.

This is a guide on how to prevent IP spoofing with HAProxy.

Call a PHP function using JavaScript.

This is a common question amongst beginner developers. In this article, I clear up the confusion about it and offer an alternative solution.

How to tell if somebody has blocked you on Facebook.

This is a guide on how to tell if somebody has blocked you on Facebook. I wrote this guide because most of the other articles about this subject were pretty much useless.

PHP: Block POST requests.

In this guide, we show you how to block POST requests using PHP. We also show you which HTTP header you should return to the client.

Changing a select element option using JavaScript.

This is a short JavaScript tutorial on how to change the selected option of a select HTML element. In this post, I will show you how to do it with and without JQuery.

No, we do not serve the “Irish Car Bomb” drink in Ireland.

The other day, I saw someone asking whether the “Irish Car Bomb” drink is popular in Ireland.

PHP: Rounding a number up.

This is a beginners guide on how to round a decimal number up using PHP’s ceil function.

The Facebook crawler DDOS.

Facebook’s crawler is an untamed beast and if you are not careful, it will cause you a lot of problems. Especially you use a lot of story images.

PHP cURL: Fixing the “SSL certificate problem: unable to get local issuer certificate” error.

This is a common error that occurs whenever you attempt to use PHP’s cURL functions to connect to an HTTPS website.

Renaming a file with the Linux command line.

This is a short beginners guide on how to rename a file using the Linux command line.

PHP tutorial: Converting images into Base 64.

This is a short PHP tutorial on how to convert an image file into Base 64 before displaying it.

Logging to a file with PHP.

This is a short guide on how to log text to a file using PHP.

Speeding up HAProxy SSL with multiple CPU processes.

This is a guide on how to speed up SSL on HAProxy. In this post, I will show you how to dedicate specific CPU processes to HTTP and HTTPS traffic.

Adding and modifying cookie values in Chrome Developer Tools.

A short guide showing you how to add and modify cookie values using Chrome’s Developer Tools feature.

Get request headers with PHP.

A short tutorial on how to get a client’s request headers using PHP.

Load image as BLOB using JQuery.

A short tutorial on how to load images as BLOB data using the JQuery JavaScript library.