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.IX Title "Level 3"
.TH Level 3 2026-08-14 "perl v5.42.2" "User Contributed Perl Documentation"
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.SH NAME
Log::Log4perl::Level \- Predefined log levels
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 2
\&  use Log::Log4perl::Level;
\&  print $ERROR, "\en";
\&
\&  # \-\- or \-\-
\&
\&  use Log::Log4perl qw(:levels);
\&  print $ERROR, "\en";
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\f(CW\*(C`Log::Log4perl::Level\*(C'\fR simply exports a predefined set of \fILog4perl\fR log
levels into the caller\*(Aqs name space. It is used internally by 
\&\f(CW\*(C`Log::Log4perl\*(C'\fR. The following scalars are defined:
.PP
.Vb 8
\&    $OFF
\&    $FATAL
\&    $ERROR
\&    $WARN
\&    $INFO
\&    $DEBUG
\&    $TRACE
\&    $ALL
.Ve
.PP
\&\f(CW\*(C`Log::Log4perl\*(C'\fR also exports these constants into the caller\*(Aqs namespace
if you pull it in providing the \f(CW\*(C`:levels\*(C'\fR tag:
.PP
.Vb 1
\&    use Log::Log4perl qw(:levels);
.Ve
.PP
This is the preferred way, there\*(Aqs usually no need to call 
\&\f(CW\*(C`Log::Log4perl::Level\*(C'\fR explicitly.
.PP
The numerical values assigned to these constants are purely virtual,
only used by Log::Log4perl internally and can change at any time,
so please don\*(Aqt make any assumptions. You can test for numerical equality
by directly comparing two level values, that\*(Aqs ok:
.PP
.Vb 3
\&    if( get_logger()\->level() == $DEBUG ) {
\&        print "The logger\*(Aqs level is DEBUG\en";
\&    }
.Ve
.PP
But if you want to figure out which of two levels is more verbose, use
Log4perl\*(Aqs own comparator:
.PP
.Vb 5
\&    if( Log::Log4perl::Level::isGreaterOrEqual( $level1, $level2 ) ) {
\&        print Log::Log4perl::Level::to_level( $level1 ), 
\&            " is equal or more verbose than ", 
\&            Log::Log4perl::Level::to_level( $level2 ), "\en";
\&    }
.Ve
.PP
If the caller wants to import level constants into a different namespace,
it can be provided with the \f(CW\*(C`use\*(C'\fR command:
.PP
.Vb 1
\&    use Log::Log4perl::Level qw(MyNameSpace);
.Ve
.PP
After this \f(CW$MyNameSpace::ERROR\fR, \f(CW$MyNameSpace::INFO\fR etc. 
will be defined accordingly.
.SS "Numeric levels and Strings"
.IX Subsection "Numeric levels and Strings"
Level variables like \f(CW$DEBUG\fR or \f(CW$WARN\fR have numeric values that are 
internal to Log4perl. Transform them to strings that can be used
in a Log4perl configuration file, use the c<\fBto_level()\fR> function
provided by Log::Log4perl::Level:
.PP
.Vb 2
\&    use Log::Log4perl qw(:easy);
\&    use Log::Log4perl::Level;
\&
\&        # prints "DEBUG"
\&    print Log::Log4perl::Level::to_level( $DEBUG ), "\en";
.Ve
.PP
To perform the reverse transformation, which takes a string like
"DEBUG" and converts it into a constant like \f(CW$DEBUG\fR, use the
\&\fBto_priority()\fR function:
.PP
.Vb 2
\&    use Log::Log4perl qw(:easy);
\&    use Log::Log4perl::Level;
\&
\&    my $numval = Log::Log4perl::Level::to_priority( "DEBUG" );
.Ve
.PP
after which \f(CW$numval\fR could be used where a numerical value is required:
.PP
.Vb 1
\&    Log::Log4perl\->easy_init( $numval );
.Ve
.SH LICENSE
.IX Header "LICENSE"
Copyright 2002\-2026 by Mike Schilli <m@perlmeister.com>
and Kevin Goess <cpan@goess.org>.
.PP
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.