List destructuring assigns indexed or named array entries to local variables.
What It Does
List destructuring assigns indexed or named array entries to local variables. The following examples distinguish a normal use case, a boundary case and a practical application.
Requirements and Compatibility
PHP 8.x and a local test environment. Apply input validation, correct error handling and the requirements of any optional libraries.
The code focuses on the core concept. Production implementation may also need routes, validation, persistence, authorization or deployment tooling.
Example 1: Basic Behavior
Start with the smallest meaningful working case.
<?php
[$first, $second] = [12, 34];
echo $first + $second;Example 2: Another Case
Examine the edge case and the observable result.
<?php
[$name, , $city] = ['Sam', 35, 'Paris'];
echo $name . ':' . $city;Practical Example: Putting It to Use
Apply the technique to a small practical task.
<?php
['id' => $id, 'name' => $name] = ['id' => 5, 'name' => 'Aki'];
echo $id . ':' . $name;Important Behavior and Edge Cases
Missing indexes can produce warnings; validate input structures first.
Comparison with Related Functions or Approaches
| Option | What it means in practice |
|---|---|
| List Assignment | List destructuring assigns indexed or named array entries to local variables. |
| Related approach | Direct array access is clearer for extracting a single field. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Ignoring the important boundary for List Assignment | Missing indexes can produce warnings; validate input structures first. |
| Assuming a related mechanism has the same behavior | Direct array access is clearer for extracting a single field. |
Key Takeaways
- List destructuring assigns indexed or named array entries to local variables.
- Missing indexes can produce warnings; validate input structures first.
- Direct array access is clearer for extracting a single field.
Before adapting these examples, verify the return values, test the failure paths and confirm that your application meets its security and environment requirements.