SEO / Webmaster

Various guides and articles that you might find interesting if you’re a webmaster.

HTTPS is invalid and might prevent it from being indexed.

A couple of days ago, we noticed that Google’s Search Console was displaying a new “HTTPS is invalid” error.

Installing required WordPress extensions for PHP 8.

A guide on how to install certain PHP 8 extensions for WordPress.

Can’t login into WordPress after changing site URL.

A guide on how to log back into WordPress after you have changed the site URL settings.

Post-processing of the image failed – WordPress error.

An annoying error that will sometimes appear while you are attempting to upload an image in WordPress.

Phishing attempt against Facebook page owners.

A warning about a phishing scam that is currently targeting the owners of Facebook pages.

Disable a button until a checkbox is checked.

In this tutorial, I will show you how to disable a HTML button until a checkbox is checked.

JavaScript Christmas Countdown

This is a basic JavaScript countdown timer that counts the number of days, hours, minutes and seconds until Christmas day.

MySQL: Extract Year and Month from Date column.

This is a short guide on how to get the year and month from a date column in MySQL.

What is Rage Bait?

Allow me to explain how digital media companies and social media gurus are drumming up outrage for the sake of generating more advertising revenue.

Setting custom headers with PHP.

This is a guide on how to set custom HTTP response headers using PHP.

Getting a random value from a JavaScript array.

This is a short tutorial on how to get a random value from a JavaScript array. To do this, we will have to generate a random index number that represents an element in the array.

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.

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.

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.

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.

Using PHP with Radio Buttons.

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

Preventing X-Forwarded-For spoofing in HAProxy.

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

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.

Blocking POST, TRACE and PUT requests with HAProxy.

A short guide on how to allow or deny certain HTTP methods using HAProxy.

Prevent unwanted domains from forwarding to Nginx.

A short guide on how to prevent spammy domains from forwarding to your Nginx web server.

PHP: Calculate the ratio between two numbers.

This is a short guide on how to calculate the ratio between two numbers using PHP.

Link existing Facebook page to Facebook app.

A guide on how to link an existing Facebook page to a Facebook app.

Facebook adding “fbclid” parameter to outbound links.

Last week, I noticed that Facebook had started to attach a query parameter called “fbclid” to outbound links.

Guide: Upgrading HAProxy from 1.6 to 1.8 on Ubuntu 16.04.4 LTS (Xenial).

This post details the steps that I took to upgrade HAProxy from 1.6 to 1.8 on Ubuntu 16.04.4 LTS (Xenial).

ngx_slab_alloc() failed: no memory in SSL session shared cache “le_nginx_SSL”

An SSL issue that I ran into the other day.