@ENV{qw(VAR1 VAR2 VAR3)} =qw(variable1 variable2 variable3); while(my$line = <DATA> ) { lastunless$line =~/\S/; chomp$line; my@components =splitqr{/}, $line; formy$c ( @components ) { if(my($var) = $c =~m{^\$(\w+)\z} ) { if(exists$ENV{$var} ) { $c = ...
GNU General Public License, which may be foundinthe Perl5source kit. Complete documentationforPerl, including FAQ lists, should be foundonthissystemusing"man perl"or"perldoc perl". If you have access to the Internet, point your browser at http://www.perl.org/, the Perl Home Page.12345678 ...
sub AUTOLOAD { my $self = shift; my $type = ref ($self) || croak "$self is not an object"; my $field = $AUTOLOAD; $field =~ s/.*://; unless (exists $self->{$field}) { croak "$field does not exist in object/class $type"; } if (@_) { return $self->($name) = ...
gt Returns True if the operand on the left is stringwise greater than the operand on the right of the operator. Returns False otherwise. cmp Returns -1, 0, or 1 if the left operand is stringwise less than, equal to, or greater than the right operand. , Evaluates the left operand, t...
if ($year > 1999) { warn "Debug: millennium bug in year $year\n"; } ## DEBUG_END The filter ensures that Perl parses the code between the <DEBUG_BEGIN> and"DEBUG_END"markers only when the"DEBUG"environment variable exists. That means that when"DEBUG"does exist, the code above shou...
词法范围通常是一个带有一组括号的代码块,例如定义子例程主体的那些或标记if, while, for, foreach,和eval语句的代码块的代码块。 以下是一个示例,说明如何使用my运算符定义单个或多个私有变量 - sub somefunc { my $variable; # $variable is invisible outside somefunc() my ($another, @an_array, %...
If this environment variable isn't set; then verify_hostname defaults to 1. Please note that that recently the overall effect of this option with regards to SSL handling has changed. As of version 6.11 of LWP::Protocol::https, which is an external module, SSL certificate verification was ...
See PerlIO, perlrun, and the discussion about the PERLIO environment variable. perl v5.12.5 Last change: 2012-11-03 10 Perl Programmers Reference Guide PERLFUNC(1) The ":bytes", ":crlf", ":utf8", and any other directives of the form ":...", are called I/O layers. The "open"...
all of which work could be bypassed by a debug variable at the statement level, like this: logger->debug( "A logging message via process-id: $$ INC: " . Dumper(\%INC) ) if $DEBUG; This effect can be demonstrated by setting up a test script with both forms, including a "debug()...
DBI checks the DBI_DSN environment variable if the DSN parameter is undef or empty. dsn_env.pl #!/usr/bin/perl use 5.30.0; use warnings; use DBI; use DBI::Const::GetInfoType; my $user = "user7"; my $password = 's$cret'; my $dbh = DBI->connect('', $user, $password) ...