1. To optimize Composer autoloading, I ran the command: composer dumpautoload -o, and received the notice: Deprecation Notice:does not comply with psr-0 autoloading stan
ard. It will not autoload anymore in Composer v2.0. See Figure 1.
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. Translated, the deprecation notice states: the class does not comply with the psr-0 autoloading standard. It will no longer autoload in Composer v2.0. However, the current Composer version is: Composer version 1.10.6, so it can be safely ignored for now. See Figure 2.
PS E:\wwwroot\pcs-api-feature-php-7.4-dumpautoload> composer -V
Composer version 1.10.6 2020-05-06 10:28:10
3. The files vendor/composer/autoload_classmap.php and vendor/composer/autoload_static.php were regenerated, with over 2,000 lines added to each. See Figure 3.
4. These are warnings and notices, not errors. Usage can continue as normal. Once Composer is upgraded to 2.0 in the future, the libraries that do not comply with the psr-0 autoloading standard will need to be removed or upgraded.