Sherlock is a PHP library that investigates obscure Minecraft logs and makes them more readable by replacing obfuscated stacktraces with useful names using Mappings provided by Mojang (or FabricMC).

composer require aternos/sherlock

To process a log you need the correct Obfuscation Map. You can get the url of a Vanilla Obfuscation Map for any Minecraft version (including snapshots) using the LauncherMetaMapLocator:

$url = new \Aternos\Sherlock\MapLocator\LauncherMetaMapLocator("1.18.2-pre1", "server");
$map = new \Aternos\Sherlock\Maps\URLVanillaObfuscationMap($url)

The second parameter in this example is the mapping type. Mojang releases both server and client Obfuscation Maps, so you will have to pick the one that matches your environment.

Fabric logs are already mapped from Vanilla's obfuscated names to Intermediary. These are different mappings that aim to keep names consistent across multiple versions. To process such a log you need the corresponding Yarn mappings. You can get the URL to a gzip map file from the Fabric Maven repository like this:

$url = new \Aternos\Sherlock\MapLocator\FabricMavenMapLocator("1.18.2-pre1");
$map = new \Aternos\Sherlock\Maps\GZURLYarnMap($url);

Yarn mappings are not environment dependent since Intermediary already takes care of the differences.

When you have created an Obfuscation Map you can get the raw content using the getContent() method. You can cache that to reduce requests to the APIs that are used to retrieve them. When you want to create an Obfuscation Map from a string directly you can create an instance of VanillaObfuscationMap and YarnMap directly.

$log = new \Aternos\Sherlock\ObfuscatedString(file_get_contents("test.log"), $map);
$remappedContent = $log->getMappedContent();
file_put_contents("test.mapped.log", $remappedContent)

The content will only be mapped once you try to retrieve it and will be stored from then on.