--- title: [RFC] Primary Constructors | daily.dev description: A PHP internals mailing list thread discussing the proposed Primary Constructors RFC, which introduces syntax to declare class properties and constructor... canonical: https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: [RFC] Primary Constructors | daily.dev og:description: A PHP internals mailing list thread discussing the proposed Primary Constructors RFC, which introduces syntax to declare class properties and constructor... og:url: https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb og:image: https://api.daily.dev/og/posts/wXnr1pMJB.png og:image:alt: [RFC] Primary Constructors og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # [RFC] Primary Constructors **[externals.io](https://daily.dev/sources/externals)** · 57 min read · 0 upvotes · 0 comments ## Summary A PHP internals mailing list thread discussing the proposed Primary Constructors RFC, which introduces syntax to declare class properties and constructor parameters at the class declaration level (e.g., `class Money(public readonly int $amount)`). The main debate centers on whether primary constructors should support a body for initialization/validation logic. The RFC author (Rob Landers) argues bodies are intentionally excluded to keep the feature focused on simple declaration cases, noting 30-70% of real-world constructors could benefit as-is. Critics (notably Nick Sdot) argue that without body support the feature is too limited, creates inconsistency with conventional constructors, and follows a pattern of PHP shipping incomplete features that never get properly finished — citing stringable enums, readonly hooks, and promoted property set hooks as examples. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [\[RFC\] Primary Constructors](https://daily.dev/posts/rfc-primary-constructors-rmjnswd5v) · externals.io · 0 upvotes · 0 comments - [\[RFC\] Primary Constructors](https://daily.dev/posts/rfc-primary-constructors-qem8lsz1y) · externals.io · 0 upvotes · 0 comments - [\[RFC\] Primary Constructors](https://daily.dev/posts/rfc-primary-constructors-gvpxifvw8) · externals.io · 0 upvotes · 0 comments - [\[RFC\] Primary Constructors](https://daily.dev/posts/rfc-primary-constructors-rwbey9qr0) · externals.io · 0 upvotes · 0 comments - [\[RFC\] Primary Constructors](https://daily.dev/posts/rfc-primary-constructors-0pmcr4opw) · externals.io · 0 upvotes · 0 comments --- Tags: [#php](https://daily.dev/tags/php) [View this post on daily.dev](https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"[RFC] Primary Constructors","url":"https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb"},"datePublished":"2026-06-29T20:44:10.200Z","dateModified":"2026-06-29T20:44:34.539Z","description":"A PHP internals mailing list thread discussing the proposed Primary Constructors RFC, which introduces syntax to declare class properties and constructor...","image":"https://media.daily.dev/image/upload/s--2-1xRawN--/f_auto/v1722860399/public/Placeholder%2011","thumbnailUrl":"https://media.daily.dev/image/upload/s--2-1xRawN--/f_auto/v1722860399/public/Placeholder%2011","isAccessibleForFree":true,"articleSection":"externals.io","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"externals.io","logo":"https://media.daily.dev/image/upload/s--9i0zxASK--/f_auto,q_auto/v1780213616/logos/externals?_a=BAMAMiWQ0","url":"https://daily.dev/sources/externals"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/rfc-primary-constructors-wxnr1pmjb","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"php","timeRequired":"PT57M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"externals.io","item":"https://daily.dev/sources/externals"},{"@type":"ListItem","position":3,"name":"[RFC] Primary Constructors"}]} ```