<?php spl_autoload_register(function (string $class): void { echo "autoload: '$class'\n"; }); foreach (['', '\\', '\Foo', 'Foo'] as $callable) { echo "class_exists(\"$callable\")\n"; class_exists($callable); }
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Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).