--- title: Namespace Load event | daily.dev description: A PHP internals mailing list thread discussing a pre-RFC idea for a namespace load event: registering a callback via spl_namespace_register() that fires the... canonical: https://daily.dev/posts/namespace-load-event-derhssl2u twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Namespace Load event | daily.dev og:description: A PHP internals mailing list thread discussing a pre-RFC idea for a namespace load event: registering a callback via spl_namespace_register() that fires the... og:url: https://daily.dev/posts/namespace-load-event-derhssl2u og:image: https://api.daily.dev/og/posts/DERhssl2u.png og:image:alt: Namespace Load event 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. # Namespace Load event **[externals.io](https://daily.dev/sources/externals)** · 15 min read · 1 upvotes · 0 comments ## Summary A PHP internals mailing list thread discussing a pre-RFC idea for a namespace load event: registering a callback via spl_namespace_register() that fires the first time PHP encounters a namespace declaration. The proposal aims to enable function and constant autoloading at the namespace level, rather than per-symbol. Discussion covers open questions like sub-namespace callback ordering, interaction with use statements, wildcard loading (use A\*), and how the engine could cache already-handled namespaces. Rowan Tommins suggests the handler should fire on namespace declarations, before class autoloading, and before undefined function/constant errors for qualified names — neatly sidestepping the global-vs-namespace resolution problem that plagues function autoloading proposals. ## Full article daily.dev links to this article rather than hosting it. 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