Software Engineering in WordPress, PHP, and Backend Development

Tag: PHP (Page 2 of 12)

How To Set PHP Version Parity in Your Shell and in Laravel

As much as I enjoy working with Laravel Valet and using Homebrew to manage different versions of PHP, there are still times in which my system has been set up in such a way that my shell is using one version of PHP and Laravel is using a different version.

At the time of this post, I see the following whenever which I run $ which php:


And when I run $ php -v, I’ll see the following output:

PHP 7.4.33 (cli) (built: Jul 13 2023 17:41:11) ( NTS )
Copyright (c) The PHP Group
Zend Engine v3.4.0, Copyright (c) Zend Technologies
    with Xdebug v3.1.2, Copyright (c) 2002-2021, by Derick Rethans
    with Zend OPcache v7.4.33, Copyright (c), by Zend Technologies

But if I was to run phpinfo(); within a page hosted via Laravel, I’d get PHP8. This is problematic because if I’m working on a function that I’m eventually going to incorporate in an app that runs in the browser, there may be functionality that doesn’t work as I expect.

As such, it’s important to make sure we have parity between Laravel and our system’s binary. To do this, issue the following command in the terminal:

$ valet use php@7.4
$ valet restart

Obviously, you’ll change the value of php@7.4 to whatever you want to use on your machine. Whatever it is, though, make sure there’s parity between the two. This way, whenever you run a script independently, then you’ll have the same results in the browser as you do in your terminal.


Is It Worth Using ChatGPT to Help Secure Source Code?

To cut straight to the point, I’m not going to say we need to rely on AI tools to help us to write truly secure code. This isn’t to say we can use tools like ChatGPT to help secure source code, but given how these utilities are trained via their LLMs, there’s only so much they can provide. In short, don’t short change security analysts who are, by nature, trained in this very thing.

That said, I’ve been using tools such as ChatGPT and other AI developer tools to help make recommendations on making code more secure. I’ll give a basic example of what I provided, what it produced, and my thoughts on it.

Note this is but a single, isolated, and simple case so there’s only so much that it can recommend. The bottom line, for me, is not so much the code it recommended but how it offered to change that I’d originally written (and then researching the why it opted to use certain function calls over others).

The Intent of the Code

In the function I’m going to share, the purpose is to look at data in the REQUEST_URI of the $_SERVER array, separate the components of the URI, and then analyze them to determine what best course of action to take.

Namely, do we break it a part and redirect to another page or do we duck out of the functionality because it’s malformed or doesn’t fit with the scheme of the rewrite rule I have in place.

The Code

The Initial Function

I wrote the initial function like this:

add_action('template_redirect', function() {
  $requestUri = $_SERVER['REQUEST_URI'];
  $requestUriParts = array_filter(explode('/', $requestUri));

  if (
    count($requestUriParts) === 2 && 
    $requestUriParts[0] === 'report' && 
    is_numeric($requestUriParts[1])) {
        $userId = intval($requestUriParts[1]);
        include plugin_dir_path(__FILE__) . 'templates/report.php';

Granted, I made some concessions to keep it relatively simple. That is, there are no exception handling and there are no conditionals to handle the case when indexes of the array are invalid.

But part of this is to see just how much AI can improve the code above. They key things to take away, despite it not handling situations outside of the conditional, are:

  • I’m verifying the array has the proper number of parts,
  • The first index of the array is report,
  • The second index of the array is an integer,
  • And if all of the above is true, then we’ll redirect to a custom template.

Again, there are some immediate issues that you can spot with this (such as the case of strings, the range of integers for user IDs, and if the file even exists.

But I digress. This is what I fed into ChatGPT to help secure source code.

The Secured Code

Given the code above, this is what ChatGPT produced:

add_action('template_redirect', function () {
    $requestUri = filter_var($_SERVER['REQUEST_URI'], FILTER_SANITIZE_URL);
    $requestUriParts = array_values(array_filter(explode('/', $requestUri)));

    if (
        count($requestUriParts) === 2 &&
        strtolower($requestUriParts[0]) === 'report' &&
    ) {
        $userId = intval($requestUriParts[1]);

        // Validate $userId and ensure it's within an appropriate range
        if ($userId > 0 && $userId <= 1000000) { // Adjust the upper limit as needed
            $templatePath = plugin_dir_path(__FILE__) . 'templates/report.php';

            // Check if the template file exists before including it
            if (file_exists($templatePath)) {
                include $templatePath;
            } else {
                // Handle the case where the template file is missing
                die('Report template not found.');
        } else {
            // Handle invalid user IDs
            die('Invalid user ID.');
    } else {
        // Handle invalid URLs
        die('Invalid URL.');

Some of the things that immediately jump out at me in terms of improving the code are:

  • strtolower on the report component of the URL
  • ctype_digit rather than is_numeric
  • Verifying a proper range of user IDs
  • Verifying the template file exists
  • Handling each case where it could fail

Now in terms of security, I don’t know where this would fall given that it’s not writing or reading data so much as sanitizing and validating it before redirecting a user to a page that should exist.

But I did like the steps that it took as they are things that we should be implementing naturally as engineers. Namely, sanitizing URL, verifying files exists, and making sure ID ranges are acceptable.

This is what struck me as the most interesting part though:

  • is_numeric. Determines if the given variable is a number or a numeric string. (A PHP string is considered numeric if it can be interpreted as an int or a float.).
  • ctype_digit. Checks if all of the characters in the provided string, text, are numerical.

Given the definitions above, we can verify that is_numeric(-5) would return true where ctype_digit(-5) would return false. Further, is_numeric(5.5) will be true and ctype_digit(5.5) will be false. This is important, especially when you’re working with non-negative whole numbers such as those that represent user IDs in a system such as WordPress.

I’m not recommending writing lazy code (like my example code above 🙃), feeding it into an AI system, and letting it do work for you. But if you’ve written something as strong and secure as you believe you can, then feeding that to an AI makes more sense as it can help take you a little further. And if you have a security analyst on your team, don’t hesitate to reach out to them for a code review.

For all the talk of AI replacing humans, we’re there yet – not in this field. But that’s not a discussion I care to have right now. If nothing else, using AI tools such as GitHub Copilot and ChatGPT to help secure source code isn’t a bad idea, but it’s not the best idea and it doesn’t replace someone who’s on your team. AI is going to be truly limited by its contextual knowledge of the environment and constraints of the system.

If anything, perhaps they are code assistants and nothing more.

Sodium Compat: PHP Sodium Functionality via Composer

If you’ve worked with PHP with any length of time and needed to use some type of built-in encryption, you’ve likely seen something about the Sodium library in the manual.

Sodium is a modern, easy-to-use software library for encryption, decryption, signatures, password hashing and more. Its goal is to provide all of the core operations needed to build higher-level cryptographic tools.

Unfortunately, the module that contains this library isn’t always installed with the PHP binary. It then has to be either re-compiled or enabled by a package manager. If you don’t have the ability, time, or access to do any of those, then there’s a solid alternative for the native library that can be installed via Composer: Sodium Compat.

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Bankruptcy on Block Editor Blocks (But It’s Not What You Think)

In August 2022, I started a series on Learning to Build Block Editor Blocks and I continued it for several months. The last thing I wrote in the series was the following:

So as I continue with the series, we’re first going to look at what’s required to implement a custom block that includes:

  • a heading,
  • a paragraph,
  • and an input field to help guide the ultimate output.

We’ll continue to use the customization options we’ve outlined in this post and show how we can apply them to what the user provides and how to ignore them for what we, as the developer, provide.

After that, we’ll look at adding an input to the frontend of the site as well as incorporating a SlotFill.

And though I had intentions to follow through starting at the beginning of the new year, I obviously never followed through with the series. In all of the years that I’ve been writing, sharing code, and generally participating in all things PHP, WordPress, and development, I don’t think I’ve ever simply declared bankruptcy on an actual series or even just on the consistency of blogging in general.

But that’s what I’m doing in this post.

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Quick Fix: Module ‘imagick’ already loaded

When working with multiple version of PHP installed via Homebrew, there’s a chance you’ll encounter error messages like this:

PHP Warning: Module 'imagick' already loaded in Unknown on line 0
PHP Warning: Version warning: Imagick was compiled against Image Magick version 1809 but version 1808 is loaded. Imagick will run but may behave surprisingly in Unknown on line 0

Granted, the version number may be different but the rest of the message will be the same. When I’ve experienced this, it’s when I’ve a set up like this:

  • I have multiple versions of PHP installed (anything from the earliest build in 7 up to the latest version in 8),
  • I swap among versions in my ~/.zshrc file depending on the project,
  • When I attempt to run code that’s on an older version of PHP after installing and using the newer or latest version of PHP, I see the above error.

To fix this, there are two things you can do:

  1. Locate the version of the php.ini file for the version of PHP you’re currently using,
  2. Update the php.ini file for the version to disable the version check on Imagick.
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