How to debug PHP asynchronous code

Tools for debugging PHP asynchronous code include: Psalm: a static analysis tool that can find potential errors. ParallelLint: A tool that inspects asynchronous code and provides recommendations. Xdebug: An extension for debugging PHP applications by enabling a session and stepping through the code. Other tips include using logging, assertions, running code locally, and writing unit tests.

How to debug PHP asynchronous code

Background

Asynchronous Programming in PHP Becoming increasingly popular as it improves performance and scalability. However, debugging asynchronous code can be more challenging than its synchronous counterpart.

Tools

PHP provides a series of tools to help debug asynchronous code:

• Psalm: a static Analysis tools that can identify potential errors and deadlocks.
• ParallelLint: A tool that inspects asynchronous code and provides suggestions.
• Xdebug: An extension for debugging PHP applications.

Practical Case

Consider the following asynchronous PHP code:

async function main() {
  $result = await Promise::resolve(42);
  echo $result;
}

main();

Now, we want to debug the main function.

Using Xdebug

1. Install Xdebug: Follow [Xdebug Documentation](https://xdebug.org/docs/install) to install.
2. Enable Xdebug: Add the following line in the PHP configuration file:

zend_extension=xdebug.so

3. Start Xdebug session: At the command line Execute the following command in:

xdebug_start();

4. Debug code: Run the PHP script and Xdebug will pause at the execution point. You can use the Xdebug toolbar or IDE to view variables and step through code.

Other Tips

• Using Logging: Print log messages to track code execution and identify problems.
• Using Assertions: Insert assertions to ensure that code is executed in the expected state.
• Run code locally: Run code in a local environment for easy debugging before deployment.
• Consider unit testing: Write unit tests to verify the correctness of asynchronous code.

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