What are the best practices for PHP functions?

PHP function best practices: follow naming conventions, clarify parameter types, declare return types, use documentation comments, pursue reusability, optimize performance, write unit tests, for example: clearly name sum() functions, declare int type parameters and return types, and ensure correctness through testing.

Best Practices for PHP Functions

Functions in PHP are valuable tools for organizing and reusing code. In order to write efficient and maintainable code, it is crucial to follow best practices for functions.

Naming Convention

• Use lowercase letters and underscores.
• Function names should clearly describe their functionality.
• Avoid using generic terms (such as do()).

Parameters

• Use type declarations whenever possible.
• Place optional parameters at the end.
• For multiple parameters, consider using an array or object.

Return type declaration

• Specifies the type returned by the function.
• Helps improve code readability and security.
• Use built-in types or custom types.

Documentation Comments

• Use PHPDoc to comment out your functions.
• Contains parameters, return type and brief description. Tags such as
• @param, @return, and @throws are useful.

Reusability

• Avoid duplication of code.
• Create functions for common functions.
• Consider using classes or namespaces to organize related functions.

Performance

• Avoid expensive operations in functions.
• Use cache to store intermediate results.
• Use lazy loading as needed.

Unit Testing

• Write unit tests for your functions.
• Test various inputs and edge cases.
• Use the assertion library to verify the results.

Practical Case

Consider the following example function, which calculates the sum of two numbers:

<?php
function sum(int $a, int $b): int
{
    return $a + $b;
}

$result = sum(5, 10);
echo $result; // 输出 15
?>

Best for Application Practice :

• Name clearly and reflect its function (sum()).
• Parameter type declaration (int).
• Return type declaration (int).
• Ensure correctness through testing.

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