The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →PSR-3 defines a common logger interface for PHP; it does not, by itself, make Apache log4php PSR-3-compatible. Before wiring the two together, check the exact log4php version in your project and confirm whether it implements PsrLogLoggerInterface or needs an adapter. The specification tells you what a conforming logger must do; log4php’s current compatibility and API must be established from its own versioned documentation.
What is PSR-3?
PSR-3 is a PHP-FIG standard for a shared logging contract. Its stated goal is to let libraries receive a PsrLogLoggerInterface and write logs in a simple, universal way. That lets a library request a logger without depending on one specific logging framework, while an application can direct logs through its chosen implementation.
PSR-3 standardizes the interface and expected behavior, not a particular destination, formatter, or logging framework. The normative requirements are in the PHP-FIG PSR-3 specification.
Does Apache log4php support PSR-3?
Apache describes Log4php as a versatile logging framework for PHP, originally ported from Log4j and later extended with PHP-specific features. That project description does not establish that a particular Log4php release implements PSR-3, what version is current, or how its API handles PSR-3 context. See the Apache Logging Services project index for the project’s broad description.
#1 Best Overall
Do not infer compatibility from the name or from documentation for Apache Log4j, the Java project, or log4net, the .NET project. Verify the package and version actually installed in your application before choosing an integration:
- Check the official PHP Log4php repository and release notes for the exact version used.
- Confirm whether that release implements
PsrLogLoggerInterfacedirectly and whichpsr/logpackage constraints it supports. - If it does not implement the interface, determine whether a wrapper can map its API to PSR-3 without losing levels, context, or exception information.
Until those checks are made, it is not possible to give a reliable Log4php-specific class name, configuration snippet, or claim that an adapter is required. The contract below is what either a native implementation or a correct adapter must satisfy.
Rank #2
What are the PSR-3 log levels?
LoggerInterface declares eight methods for RFC 5424 severity levels, plus a generic log method that takes the level as an argument.
| Level | Method |
|---|---|
| Emergency | emergency() |
| Alert | alert() |
| Critical | critical() |
| Error | error() |
| Warning | warning() |
| Notice | notice() |
| Informational | info() |
| Debug | debug() |
| Caller-supplied | log($level, ...) |
Calling log() with one of the defined levels must have the same result as calling that level’s named method. If the implementation receives an unrecognized level, it must throw PsrLogInvalidArgumentException; silently dropping it or treating it as an arbitrary new level does not meet the specification.
Quick wins for a faster PC:
Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →How do messages, placeholders, and context work?
A PSR-3 message is a string or an object with a __toString() method. An implementation may offer special handling for particular objects, but otherwise it must cast the message to a string.
Keep message text static and supply changing values through the context array. A placeholder must match a context key and use the exact {name} form: one opening and one closing brace, with no whitespace inside. For example, a message template might be User {user_id} could not be loaded with a context entry keyed user_id. Context may contain arbitrary data; the specification does not require every logger to interpolate every value.
Rank #4
This separation is intentional. PHP-FIG’s PSR-3 Meta Document explains that static message text is more usable by translation systems, while each destination can decide how to escape context for its output format. Avoid building variable values into the message string when they can be passed as context.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should exceptions be passed?
Pass an exception in the context array under the exception key when the logger should include exception details, for example its stack trace. The PSR-3 specification requires an implementation that uses this value as an exception to verify that the value is actually an Exception. Do not assume that any arbitrary value under that key can safely be treated as one.
How do I implement the contract?
If you are writing a logger or adapter, implement all the behavior required by LoggerInterface, even if the underlying framework uses different method names or data structures. A conforming adapter should map the eight levels and generic dispatch, preserve useful context, and handle the exception convention without assuming every context value is an exception.
The PSR-3 specification also provides AbstractLogger and LoggerTrait to reduce repetitive forwarding methods. Both leave generic log() as the core implementation point; when using the trait, the class must still explicitly implement LoggerInterface. These are PSR-3 package helpers, not evidence that Log4php itself provides native PSR-3 support.
Quick Recap
- Use
AbstractLoggerorLoggerTraitwhen implementing the standard interface would otherwise mean repeating level-method forwarding code. - Use a direct implementation only when the installed Log4php version demonstrably satisfies the interface.
- Use an adapter when the installed version exposes a different API, and test the adapter against the installed
psr/logversion.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
