URI extension polyfill

A polyfill for the PHP URI extension introduced in PHP 8.5. All features as of PHP 8.5.8 are replicated.

Features

• Compatibility back to PHP 7.1
• Passes all urltestdata.json Web Platform tests
• Passes most PHP tests (see Differences below)
• Requires no PHP extensions

Differences

• The Uri\Rfc3986\Uri and Uri\WhatWg\Url classes are neither final nor read-only
• Uri\Rfc3986\Uri and Uri\WhatWg\Url object serialization differ and are subject to change
• Performing var_export() on Uri\Rfc3986\Uri and Uri\WhatWg\Url objects will yield different results
• Casting Uri\Rfc3986\Uri and Uri\WhatWg\Url to array will yield different results
• When using PHP 8.0 or earlier Uri\UriComparisonMode and Uri\WhatWg\UrlValidationErrorType are classes with a series of string constants rather than enumerations.
• Where the enumerations Uri\UriComparisonMode and Uri\WhatWg\UrlValidationErrorType are used as parameter types, their types are not enforced
• The result of converting an internationalized domain name to ASCII may differ
• The following PHP bugs are preemptively fixed:
  • GH-22608: ext/uri: RFC 3986 initial-double-dot path can yield incorrect normalization
  • GH-22618: ext/uri: RFC 3986 IPv6 handling is inconsistent
  • GH-22628: ext/uri: Percent-encoding of caret in WHATWG URL paths is not performed
  • GH-22629: ext/uri: WHATWG Validation error incorrect with empty host and non-empty userinfo

Availability

The polyfill is available on Packagist as mensbeam/uri, with source code available on my personal repository and mirrored on Codeberg.