Do not implicitly fall back to spl_autoload() if no autoloader is registered on PHP 7

[bwoebi]

This could lead to accidental inclusion of files, breaking __autoload() and possibly including the wrong file.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.97%. Comparing base (5513f97) to head (0b1f9b0). Report is 2 commits behind head on master.

Additional details and impacted files

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Benchmarks

Benchmark execution time: 2024-08-29 20:46:23

Comparing candidate commit 0b1f9b01b163ba2f5df86c1cca85b078a1941857 in PR branch bob/fix-autoload with baseline commit 5513f97af537b90c03ce237741c3440974c3f38f in branch master.

Found 5 performance improvements and 1 performance regressions! Performance is the same for 172 metrics, 0 unstable metrics.

scenario:ContextPropagationBench/benchExtractHeaders128Bit-opcache

• 🟩 execution_time [-49.927ns; -30.073ns] or [-4.758%; -2.866%]

scenario:EmptyFileBench/benchEmptyFileBaseline-opcache

• 🟥 execution_time [+133.203µs; +235.477µs] or [+5.038%; +8.906%]

scenario:EmptyFileBench/benchEmptyFileOverhead

• 🟩 execution_time [-204.548µs; -64.472µs] or [-7.234%; -2.280%]

scenario:PDOBench/benchPDOOverhead

• 🟩 execution_time [-18.204µs; -15.852µs] or [-6.625%; -5.769%]

scenario:PDOBench/benchPDOOverheadWithDBM

• 🟩 execution_time [-18.433µs; -16.419µs] or [-6.205%; -5.527%]

scenario:WordPressBench/benchWordPressOverhead

• 🟩 execution_time [-21.761ms; -21.507ms] or [-83.901%; -82.920%]