Collections Laravel Package

Product Decisions This Supports

• Domain modeling: value objects vs. primitives. Xi Collections gives you first-class Enum and immutable collection types, which is exactly the toolkit for deciding whether a status column should be a string, an int constant, or a typed enumeration — and whether a lines relationship should be an array, a mutable Collection, or an immutable value object.
• Aggregate boundary and invariant enforcement. Immutability means every "mutation" returns a new instance, so an aggregate can be handed to a view or a serializer without defensive copies or accidental aliasing bugs. This supports a build-vs-buy decision on whether to hand-roll immutability in your domain layer or adopt a library.
• Roadmap / modernization sequencing. The package is a concrete artifact of the PHP 5.3 era — pre-native-enums, pre-typed-properties, pre-generics. If your roadmap includes a PHP 8.x upgrade, evaluating this package is really a decision about retiring legacy abstractions in favor of native enum (8.1+), readonly properties (8.1+), and array_is_list/first-class callable syntax.
• API design precedent. Even if you never install it, the enumerated-type + typed-collection split is a useful reference for teams designing internal interfaces for state machines, permission sets, order lines, feature-flag sets, and event streams.
• Use cases that map cleanly: finite state machines (order/payment lifecycle), permission and role sets, immutable config snapshots, deduplicated tag sets, and any collection passed across a boundary where mutation must be provably impossible.

My call: the category (immutable enumerations and collections) scores well on opportunity; this implementation does not. Treat it as a design reference, not a dependency.

When to Consider This Package

Consider it only if:

• You are actively maintaining a PHP 5.3/5.4/5.5 codebase (rare, and itself a roadmap red flag) where native enums and readonly properties do not exist.
• You need immutable collection semantics and the alternative is writing your own from scratch — and you have already resolved the license question (composer metadata reports NOASSERTION, so legal must confirm terms before any install).
• You are using the surrounding Xi framework and want consistency with its idioms.

Look elsewhere if any of the following is true — and for most teams at least three will be:

• PHP version. Targeting PHP 5.3 (EOL August 2014) signals no compatibility work for PHP 7/8. Expect deprecation warnings or breakage on modern runtimes, and no coverage under typed properties or strict_types.
• Native enums exist. On PHP 8.1+, a backed enum plus readonly classes covers the enumeration use case with zero dependencies and full static analysis support.
• You need maintained collections. Prefer ramsey/collection, marcosh/php-collections, yiisoft/collections, Doctrine Collections (if already in the stack), or Laravel's Illuminate\Support\Collection for the mutable/fluent case.
• Ecosystem signal matters. 26 stars and 0 dependents means no downstream validation, no security patch pipeline, and no community to catch regressions. This is effectively a solo/sunset project.
• You need a support contract or SLA. There is none, and the bus factor is one.

If your answer is "we're on PHP 8 and we want immutable domain collections," the honest recommendation is: adopt the pattern, choose a maintained library or a 40-line internal base class, and move on.

How to Pitch It (Stakeholders)

To executives (one paragraph): This package solves a real modeling problem — making enumerations and collections type-safe and impossible to mutate accidentally — and the category is worth investing in. This particular library, however, is a legacy artifact: it targets PHP 5.3 (end-of-life since 2014), has no dependents, no visible maintenance, and an unresolved license. I recommend a time-boxed spike (1–2 days) to borrow its interface design, then standardize on PHP 8.1 native enums plus a maintained collection library. Cost of the spike is trivial; cost of adopting the dependency is unbounded upgrade and legal risk.

To engineering (the ask):

• Do not add xi/collections to composer.json.
• Do borrow the two-idea split: a typed enumeration base and an immutable collection contract for aggregate internals.
• Implement a thin internal abstraction (or adopt ramsey/collection) behind an interface you own, so the choice is reversible.
• Add static analysis (phpstan/psalm) rules that flag mutable arrays crossing domain boundaries — that is the real, durable version of what this package was reaching for in 2012.

Framing line for the roadmap review: "Low-cost, low-risk to study; high-risk to depend on. We take the pattern, not the package."