How do I use static analysis in PHP (Psalm, PHPStan)?

Static analysis is a crucial technique in PHP development that helps identify potential issues in your code before execution. Two popular tools for this purpose are PHPStan and Psalm. These tools analyze your source code without running it, ensuring that your code adheres to best practices and is free from common bugs.

// Example code for PHPStan and Psalm

require 'vendor/autoload.php';

$number = 3;

// This will raise an error if $number is not an integer
if ($number > 0) {
    echo "The number is positive.";
}

// Use PHPStan or Psalm to analyze your code
// phpstan analyse src
// ./vendor/bin/psalm