[PHP] Retain the next cautious URL match per mapping

[adamziel]

Retains the next URL match already found for each cautious rewrite mapping.

A scan with several mappings previously ran every mapping regexp after every match. Mappings whose next match was later in the text searched the same bytes again on each call. The processor now keeps their relevant captures until the scan reaches them. Captures behind the current byte offset are refreshed, and exhausted mappings stay exhausted. The single-mapping path remains direct because it has no future lookahead to reuse.

For 100 matches of one source URL, the local benchmark measured:

Mappings	Before	After
1	92.8 µs	93.2 µs
2	342 µs	128 µs
8	1.85 ms	0.20 ms
32	7.90 ms	0.48 ms
64	16.16 ms	0.85 ms

Testing

The URL rewriting suite passes with 364 tests and 2,502 assertions. New cases cover a future mapping retained across repeated earlier matches and a shorter overlapping mapping refreshed after the longer source wins. PHPStan and the coding-standard checks pass for the changed files.

[github-actions]

Pull pipeline performance — large-directory

Site: large-directory · 2,000+ plus targeted file-transfer scenarios files · 10,000 posts · 25,000 postmeta · PHP 8.5.9

Stage	PR	trunk	Δ	Status	Details
playground-sqlite-db-pull	9.73 s	9.41 s	⚪ +322 ms (+3.4%)	✓	condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected trunk: condition=db-pull in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=lexer native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=selected
playground-sqlite-db-apply	3.58 s	3.58 s	⚪ -2 ms (-0.1%)	✓	condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified trunk: condition=db-apply to SQLite in PHP.wasm runtime=php.wasm 8.3 wp_mysql_parser=enabled mode=parser native_lexer=verified native_token_stream=WP_MySQL_Native_Token_Stream native_token_count=18 native_parser=verified native_ast=WP_MySQL_Native_Parser_Node sqlite_driver_parser=verified
Total	13.31 s	12.99 s	⚪ +320 ms (+2.5%)

_{Numbers carry runner noise; treat single-run deltas as directional, not authoritative.}

_{📈 Trunk performance history — commit-by-commit timeline.}