Snippets

Snippet Library

Practical pure PHP patterns that are easy to study, adapt and use.

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Transactional Email Envelope Builder

Builds a normalized transactional email envelope with recipient validation, subject trimming, and headers.

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Email Delivery Result Parser

Parses mail delivery provider responses into accepted, deferred, bounced, or failed status records.

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Double Opt-In Request Plan

Creates a double opt-in request plan with token expiry, recipient hash, and replay protection metadata.

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Unsubscribe Link Token Plan

Builds unsubscribe token metadata with route, expiry, scope, and one-click email compliance fields.

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Order Number Collision Check

Checks a generated order number against known identifiers and prepares retry guidance when collisions exist.

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Cart Line Merge Review

Reviews cart lines and merges compatible SKU, option, and price records without losing quantity detail.

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Cart Total Reconciliation

Reconciles cart subtotal, discounts, tax, shipping, and grand total using integer cents.

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Discount Rule Evaluation Trace

Traces discount-rule eligibility decisions so an admin can see why each rule passed or failed.

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Tax Region Resolution Map

Resolves a tax region from shipping country, state, postal prefix, and fallback rules.

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Shipping Rate Selection Audit

Audits shipping-rate candidates and selects the lowest eligible service while recording rejection reasons.

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Inventory Reservation Window Plan

Plans inventory reservation expiry windows from cart age, stock pressure, and payment state.

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Invoice Line Sanity Check

Checks invoice lines for negative values, quantity errors, subtotal drift, and duplicate SKU rows.

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