1、优化 Composer 自动加载，执行命令：composer dumpautoload -o，提示：Deprecation Notice:does not comply with psr-0 autoloading stan
ard. It will not autoload anymore in Composer v2.0.如图1
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PS E:\wwwroot\pcs-api-feature-php-7.4-dumpautoload> composer dumpautoload -o
Generating optimized autoload files
Deprecation Notice: Class HTMLPurifier_Language_en_x_test located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/ezyang/htmlpurifier/library\HTMLPurifier\Language\classes\en-x-test.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathArrayAccessTest located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathArrayAccessTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathBenchmarks located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathBenchmarks.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathDashedIndexTest located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathDashedIndexTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathLexerTest located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathLexerTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathSliceAccessTest located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathSliceAccessTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathTest located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Deprecation Notice: Class Flow\JSONPath\Test\JSONPathTestClass located in E:/wwwroot/pcs-api-feature-php-7.4-dumpautoload/vendor/flow/jsonpath/tests\JSONPathTest.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Autoload/ClassMapGenerator.php:201
Generated optimized autoload files containing 3053 classes
2、翻译之后，弃用通知：类不符合 psr-0 自动加载标准。在 Composer v2.0 中将不再自动加载。不过，现在 Composer 的版本是：Composer version 1.10.6，暂时可以不用理会。如图2
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PS E:\wwwroot\pcs-api-feature-php-7.4-dumpautoload> composer -V
Composer version 1.10.6 2020-05-06 10:28:10
3、文件 vendor/composer/autoload_classmap.php、vendor/composer/autoload_static.php 重新生成，各自添加了 2000 余行。如图3
4、这些是警告和注意，没有错误。仍然可以继续使用。如果后期 Composer 升级至 2.0 后，需要想办法删除或者升级不符合 psr-0 自动加载标准的类库了。