Project Summary
Yii is a high-performance component-based PHP framework for developing large-scale Web applications. Yii enables maximum reusability in Web programming and can significantly accelerate the development process. The name Yii (pronounced as [i:]) stands for easy, efficient and extensible.
Yii is easy to learn and use. You only need to know PHP and object-oriented programming. You are not forced to learn a new configuration or templating language.
Yii is extremely fast. Its overhead to applications written on top of it is negligible. As a matter of fact, it is one of the most efficient PHP frameworks around.
Yii is highly reusable and extensible. Yii is purely object-oriented. Everything in Yii is a self-contained component which can be configured, reused or extended easily.
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In a Nutshell, Yii PHP Framework...
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has a well established, mature codebase
maintained by a very large development team
with stable Y-O-Y commits -
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took an estimated 79 years of effort (COCOMO model)
starting with its first commit in July, 2008
ending with its most recent commit 6 days ago
BSD 3-clause "New" or "Revised" License
Permitted
Commercial Use
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Distribute
Place Warranty
Forbidden
Hold Liable
Use Trademarks
Required
Include Copyright
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
GNU Free Documentation License v1.2
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Use Patent Claims
Forbidden
Sub-License
Hold Liable
Required
Distribute Original
Disclose Source
Include Copyright
State Changes
Include License
Include Install Instructions
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryApr 11 2025 — May 11 2025
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12 Month SummaryMay 11 2024 — May 11 2025
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