There’s a big difference between getting a PHP project working and building one that you’ll still be happy to work on six months later.
When you start from scratch, it’s quite easy to open your editor, create a few PHP files and get going. That works for a small test project. For a real business application, though, it can cause headaches surprisingly quickly.
Features get added. The database grows. Someone asks for an API integration that wasn’t part of the original plan. Before long, a small project isn’t quite so small anymore.
That’s why it pays to get the basics right from the start.
First, work out what you're building
Don't start with PHP. Start with the actual problem.
Say a client asks for a booking system. You could start building a calendar and a booking form straight away, but there are probably quite a few things you don't know yet.
Can customers change their booking? Do they pay when they book? Can staff block dates? Does the customer receive an email or text? Is there one location or several?
These aren't minor details. They change how you'll build the application.
We normally find it useful to separate requirements into two groups. Things the first version absolutely needs and things that would be useful later.
That alone can stop a project becoming unnecessarily complicated.
Core PHP or a framework?
This depends on the job.
There's nothing wrong with using core PHP for a straightforward project. You don't need a large framework just because one exists.
On the other hand, once you're dealing with logins, different user roles, payments, APIs and a sizeable admin area, a framework can make life much easier.
Laravel is a common choice because a lot of the groundwork is already there. Routing, authentication, database migrations and validation don't all need to be reinvented.
The important bit is choosing what suits the project, rather than choosing a technology first and trying to make the project fit around it.
Sort out your local setup
Before doing any serious development, get your environment in order.
You'll need PHP and, in most cases, MySQL or another database. Composer will handle dependencies and Git is worth using from the very beginning.
For local development, you might use XAMPP, MAMP, Docker or another setup you're comfortable with.
There's no prize for having the fanciest development environment. It just needs to be reliable and, if you're working in a team, easy for another developer to reproduce.
Don't let the file structure become a mess
This doesn't seem important when you only have five files.
It becomes very important when you have 150.
Keep related code together and try to avoid putting everything into one enormous PHP file. Configuration, database work, business logic, templates and public assets should have some sort of sensible separation.
Frameworks help with this because they already have a structure.
If you're working without one, decide on your own structure early and stick to it.
Future you will be glad you did.
Think about the database before filling it with data
Database changes can become awkward once an application is already being used.
Imagine you've built a basic shop. You have customers, products and orders.
A month later, products need sizes and colours. Then customers need multiple delivery addresses. Then the business wants discount codes.
None of those requests are unusual, but they'll be much easier to deal with if the original database wasn't thrown together in a hurry.
You don't need to predict every future feature. Just think about how the main pieces of information relate to each other and avoid unnecessary duplication.
It's also worth thinking about what you'll need to search regularly. A database query that feels instant with 100 records may be a different story when you've got 100,000.
Get the main journey working
At this point, start building.
But build the important stuff first.
If it's a shop, make sure somebody can find a product, add it to their basket, pay and receive an order confirmation.
If it's a booking platform, make sure they can find an available slot and actually book it.
You can make things prettier later. You can add extra filters later. You can add clever dashboard widgets later.
First make sure the reason the application exists actually works.
Expect people to enter the wrong thing
They will.
Someone will leave a required field empty. Someone else will enter text where you expected a number. Another person will click the submit button twice because the page didn't respond quickly enough.
Your PHP code needs to deal with that.
Validate information before saving it and don't assume that because a form asks for the right information, that's what you'll receive.
This is also where security matters. Use prepared queries, handle passwords correctly, control access to private pages and don't expose sensitive configuration details.
Security isn't a job for the final afternoon before launch.
APIs rarely behave perfectly all the time
If your project connects to Stripe, a CRM, an email platform or another external system, assume that connection will fail at some point.
It might only be for a few seconds, but your application still needs to know what to do.
For example, if a payment request times out, don't immediately create another payment without checking what happened to the first one. That's how customers end up being charged twice.
Log API errors. Show useful messages where appropriate. Give yourself enough information to investigate when something goes wrong.
You'll appreciate those logs later.
Test the awkward cases
Developers naturally test the journey they just built.
Register. Log in. Add product. Pay. Done.
Try breaking it instead.
Refresh halfway through checkout. Enter an invalid email address. Upload the wrong file type. Try opening an admin URL while logged in as a normal customer. Submit the same form twice.
This sort of testing often finds the bugs that matter.
It's also worth getting someone who hasn't worked on the project to try it. They'll usually do something you never thought of.
Then look at performance
If the application feels slow, find out why before throwing more server resources at it.
Check your database queries first. Look for pages making the same query repeatedly. See whether you're requesting information from an external API every time a page loads when that information could be cached.
Large images and unnecessary frontend files can also make a PHP site feel slow even when the backend itself is fine.
Measure first. Fix the actual problem.
Before you put it live
Don't treat launch day as the first proper test.
Use the production environment to check the important journeys again.
Test forms, emails, user accounts, permissions, payments and any third-party connections.
Make sure SSL is working. Check that backups exist and, more importantly, that you know how you'd restore one.
Remove test accounts and development settings too. You don't want customers receiving an email that still says "TEST ORDER".
It happens.
After launch
Something will need changing.
That's not a sign that the project was badly built. Real users have a habit of showing you things that weren't obvious during development.
Maybe a form is confusing. Maybe staff need another filter in the admin area. Maybe a process that made sense on paper takes too many clicks in real life.
Make those improvements based on actual use.
At the same time, keep PHP, packages and integrations up to date. Check logs occasionally rather than waiting for a customer to tell you something has stopped working.
A final thought
A good PHP project isn't necessarily the one with the most complicated architecture.
It's the one that does its job properly and can still be understood when somebody comes back to change it later.
Plan enough before you start. Keep the code organised. Don't rush the database. Test the things users aren't supposed to do, because somebody eventually will.
And build for what the project actually needs, not for every feature it might possibly have one day.
If you're starting a new project, our PHP project step-by-step guide goes into the development process in more detail.
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