They are very similar so it is not surprising that it’s a bit confusing. The summary is that PSR-0 had some backwards compatibility features for PEAR-style classnames that PSR-4 dropped, as such it only supports namespaced code. On top of that PSR-4 does not force you to have the whole namespace as a directory structure, … Read more
If you are using composer, you do not create the autoloader but let composer do its job and create it for you. The only thing you need to do is create the appropriate configuration on composer.json and execute composer dump-autoload. E.g.: { “autoload”: { “psr-4”: {“App\\”: “src/”} } } By doing the above, if you … Read more
The problem is that the classmap is NOT actually faster in every case! The speed of the classmap comes from not having to check the filesystem if a file exists before doing the always necessary work of loading it, parsing it (opcode caches will help here) and then executing it. But the downside of the … Read more