SplStack
Last updated: April 6, 2026 Minimum PHP Version: PHP 5.3+ Status: Stable
Overview
Stack (LIFO - Last In First Out) data structure implementation. Perfect for undo/redo operations, expression parsing, or browser history.
Stack Operation Diagram
graph TB
D["⬆️ push<br/>Add to Top"]
D --> E["Item 3"]
E --> F["Item 2"]
F --> G["Item 1"]
G --> H["⬇️ pop<br/>Remove from Top"]
I["Top<br/>Add/Remove Here"] -.-> E
J["Bottom"] -.-> G
style D fill:#c8e6c9,stroke:#388e3c,color:#000
style E fill:#fff3e0,stroke:#f57c00,color:#000
style F fill:#fff3e0,stroke:#f57c00,color:#000
style G fill:#fff3e0,stroke:#f57c00,color:#000
style H fill:#ffccbc,stroke:#d84315,color:#000
style I fill:#f3e5f5,stroke:#7b1fa2,color:#000
style J fill:#f3e5f5,stroke:#7b1fa2,color:#000
When to Use
- Appropriate use case 1
- Appropriate use case 2
- Not for use case 1
- ❌ Not for use case 2
Basic Example
<?php
// Basic usage example
?>
Advanced Example
<?php
// Advanced usage example
?>
Comparison
| Feature | SplStack | Alternative |
|---|---|---|
| Use Case | Primary use | Secondary use |
| Performance | Fast | Varies |