Code

Code examples for languages such as PHP and JavaScript.

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.

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.

PHP: Rounding a number up.

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

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.

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.

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.

PHP: Calculate the ratio between two numbers.

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

Using a local WSDL file with PHP SoapClient.

This is a short guide on how to use a local WSDL file with the PHP SoapClient object.

PHP: Send POST request WITHOUT cURL.

This is a short PHP tutorial on how to send a HTTP POST request without using cURL.

Fixing “Uncaught error: Call to undefined function curl_init”

This is a common error that occurs whenever PHP’s curl extension has not been installed or enabled.

PHP: Get a list of included PHP files.

This is a PHP tutorial on how to get a list of files that have been included in your script.

Copy a file with PHP.

This is a short tutorial on how to copy files using PHP.

Call to undefined function mysql_connect()

If you are encountering this undefined error, then it means that you are trying to use the old mysql_* functions in PHP 7.

Secure PHP logout script.

This is a short PHP tutorial on how to create a simple user logout script that guards against CSRF attacks.

PHP: Detect if operating system is Windows.

This is a PHP tutorial on how to check if the operating system is Windows.

Infinite loops with PHP.

This is a short guide on how to create an infinite loop using PHP.

Autoloading PHP classes that use namespaces

This is a basic tutorial on autoloading PHP classes that use namespaces.

Tutorial: Subtracting numbers using PHP.

This is a beginners tutorial on how to do basic subtraction in PHP. The aim of this tutorial is to help developers who are completely new to the language.

Send JavaScript object via Ajax to PHP script.

This is a short guide on how to send a JavaScript object to a PHP script using an Ajax request.

JSON.stringify returning empty string / object.

The other day, I came across an issue where the JSON.stringify method failed to convert one of my objects into a JSON string.

Releasing session locks in PHP.

A short and simple guide to releasing session locks in PHP.

SSL with HAProxy and PHP: Forwarding HTTPS header.

A short guide on how to forward HTTPS headers with HAProxy so that PHP knows what protocol is being used.

JavaScript Date: One week ago.

This is a short tutorial on how to create a JavaScript date that is “7 days ago” or “30 days ago”.

Reading an email inbox with PHP – IMAP.

This is a short tutorial on how to connect to an IMAP email inbox using PHP’s imap functions.

Handling Ajax errors with jQuery.

This is a tutorial on how to handle errors when making Ajax requests via the jQuery library.

PDO: Get the ID of the last inserted row.

This is a short guide on how to get the ID of the last inserted row using PDO’s lastInsertId method.

How to generate a random number with PHP.

In this guide, we show you how to generate a random number using PHP. We also explain why you should use the random_int function.

Ajax poll request every 10 seconds.

This is a short tutorial on how to send an Ajax request every 10 seconds – something that is often referred to as polling.