PHP – Rob Allen's DevNotes

Validating default PHP session ID values

I recently needed to validate the value created by PHP for its session ID. After a bit of research, I realised that there are two interesting php.ini config settings that relate to this value: session.sid_length is the number of characters in the ID session.sid_bits_per_character controls the set of characters used. From the manual: The possible values are '4' (0-9, a-f), '5' (0-9, a-v), and '6' (0-9, a-z, A-Z, "-", ","). Therefore, to validate the session… continue reading.

Posted on 13 February 2020 in PHP View all 7 comments

Routing in Slim 4

Routing in Slim 4 works pretty much exactly the same as in Slim 3. They are used to map a URL that the browser requests to a specific handler that executes the code for that particular page or API endpoint. You can also attach middleware that will only be run when that route is matched. The route in the slim4-starter looks like this:

$app->get('/[{name}]', HomePageHandler::class);

1	$app->get('/[{name}]', HomePageHandler::class);

It is made up of the method, the pattern and the… continue reading.

Posted on 18 December 2019 in PHP, Slim Framework 4 View all 3 comments

Changing an SQL Server primary key in Doctrine Migrations

I recently came across a rather weird quirk when trying to change a primary key in Sql Server using Doctrine Migrations: you need to use two migrations to get it to work. This is incredibly minor and I'm only writing it up as it confused me for a while so I thought that I'd document so that I'll find this article if I run across it again in the future! This is the migration:

final class Version20191023125629 extends AbstractMigration
{
    public function up(Schema $schema) : void
    {
        $table = $schema->getTable('page_category');
        $table->dropPrimaryKey();
        $table->setPrimaryKey(['page_uuid', 'category_id']);
    }

    public function down(Schema $schema) : void
    {
        $table = $schema->getTable('page_category');
        $table->dropPrimaryKey();
        $table->setPrimaryKey(['page_id', 'category_id']);
    }
}

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

final class Version20191023125629 extends AbstractMigration

{

public function up(Schema $schema) : void

{

$table = $schema->getTable('page_category');

$table->dropPrimaryKey();

$table->setPrimaryKey(['page_uuid', 'category_id']);

}

public function down(Schema $schema) : void

{

$table = $schema->getTable('page_category');

$table->dropPrimaryKey();

$table->setPrimaryKey(['page_id', 'category_id']);

}

Posted on 20 November 2019 in PHP Leave a comment

Testing migrating to Laminas

Zend Framework is renaming to Laminas and all the source code is moving to a new GitHub organisation. Implicitly this means a new PHP top level namespace. As you can imagine, this implies that a lot of our code will need to change, so Matthew, Michał and the team have been writing migration tooling to make this easier. It's now time to test it and they need all the help they can get on real-world… continue reading.

Posted on 6 November 2019 in Laminas, PHP, Zend Framework One comment so far

Embedding Notist slides

This site uses WordPress under the hood as I find the flexibility that a good CMS provides quite useful. For the talks section, I use a custom post type so that I can set additional properties on the post and customise the display. With my usual lack of imagination, my custom post type is called talk. When Notist was released, I've been uploading the PDFs for my presentations there so that I have a nicely… continue reading.

Posted on 30 October 2019 in PHP, WordPress Leave a comment

Custom error rendering in Slim 4

One of the nice things about Slim 4 is that it's easier to customise the HTML generated on error without having to worry about the rest of the error handling mechanism. This is because we have separated error rendering from error handling. Slim's default ErrorHandler maintains a list of renderers, one for each content-type and will delegate the creation of the error payload (HTML, JSON, XML, etc) to the renderer. Out of the Box, the… continue reading.

Posted on 16 October 2019 in PHP, Slim Framework, Slim Framework 4 View all 13 comments

Dependency Injection in Slim 4

In contrast with Slim 2 and Slim 3, Slim 4 does not ship with a DI container, but instead, supports any PSR-11 compatibly DI container that you provide. This is part of Slim 4's commitment to interoperability via the PHP-FIG standards. The easiest way to add a container to your Slim application is to call AppFactory::setContainer() before you call AppFactory::create(). The setContainer() method expects any PSR-11 container. Register the container with Slim Let's look at… continue reading.

Posted on 2 October 2019 in PHP, Slim Framework, Slim Framework 4 View all 5 comments

Running Slim 4 in a subdirectory

If you want to run Slim 4 in a subdirectory of your website, then you have a few things you need to do. Let's consider the situation: Your main website is in the directory /var/www/html and is accessed at https://example.com/. You want your new Slim 4 app to be in the directory /var/www/html/myapp and to be accessed at https://example.com/myapp. Your Slim 4 index.php file is stored in /var/www/html/myapp. There are two things you need to… continue reading.

Posted on 26 September 2019 in PHP, Slim Framework, Slim Framework 4 View all 3 comments

Slim4-empty: minimal Slim 4 starting point

To simplify creating a new Slim 4 project, I've created slim4-empty which does this for me. To use it:

$ composer create-project akrabat/slim4-empty my-new-project

1	$ composer create-project akrabat/slim4-empty my-new-project

and you're done! The my-new-project directory is created and contains Slim 4 along with a minimally viable public/index.php to get you going. You can then run it with the PHP built-in server:

php -S 0.0.0.0:8888 -t public/

1	php -S 0.0.0.0:8888 -t public/

And navigate to https://localhost:8888 to view "Hello World" in your browser. What does it contain? Slim4-empty provides no structure to your project… continue reading.

Posted on 11 September 2019 in PHP, Slim Framework, Slim Framework 4 View all 2 comments

Receiving input into a Slim 4 application

A Slim 4 (and Slim 3) application receives data from three places: Any query parameters on the URL (the key-value pairs after the ?) The HTTP message's body (usually for POST and PUT) messages Parameters in the URL (such as the 3 in https://example.com/users/3 Within the application, these are available within the PSR-7 Request object. Let's start with a simple Slim 4 application. Firstly we require the Slim framework and a PSR-7 implementation: