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< php $items = array(1,2,3,4,5,6,7,8,9,10); $start = microtime(); for($x=0; $x<100000; $x++){ for($i=0; $i<count($items); $i++) { $j = 100381*$i; } } echo microtime()-$start;

This is because use creates a BEGIN block of its own, as we have already seen Blocks nest too a BEGIN inside a BEGIN will execute during the compilation phase of the outer block A chain of use statements, one module including the next at compile time, does this implicitly, and similarly chains the END blocks (if any)..

If we need to perform initialization within a module before it is used, we can place code inside the source file to perform whatever tasks we need to do, for example, loading a configuration file: package My::Module; return initialize(); sub initialize { ... } ... other sub and var declarations ...

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This module doesn t need a 1 at the end because its success or failure is returned explicitly. However, the initialization only takes place once the module starts to execute; we can t predefine anything before defining critical subroutines. A BEGIN block solves this problem. It forces execution of a module s initialization code before the rest of it compiles. As an example, here is a module that computes a list of variables to export at compile time and exports them before the code that uses the module compiles. For simplicity, we have used a local hash to store the variable definitions and kept it to scalars, but it is easily extensible: # My/SymbolExporter.pm package My::SymbolExporter; use strict; BEGIN { use vars '@SYMBOLS'; # temporary local configuration - we could read from a file too my %conf = ( e => 'mc2', time => 'money', party => 'a good time', ); sub initialize { no strict 'refs'; foreach (keys %conf) { # define variable with typeglob *{__PACKAGE__.'::'.$_} = \$conf{$_}; # add variable (with leading '$') to export list push @SYMBOLS, "\$$_"; } return 1; } return undef unless initialize; } use Exporter; our @ISA = qw(Exporter); our @EXPORT = ('@SYMBOLS',@SYMBOLS); Ordinarily, we d use the Exporter module or an import method to deal with this sort of problem, but these are really just extensions to the basic BEGIN block. Just to prove it works, here is a script that uses this module and prints out the variables it defines: #!/usr/bin/perl # symbolexportertest.pl use warnings; use strict; use My::SymbolExporter; print "Defined: @SYMBOLS\n\n"; print "e = $e\n"; print "time = $time\n"; print "party = '$party'\n";

One of Subversion s most interesting features is its extensive property system. Subversion allows you to apply abstract information to a file using a key and value pair system. Like the files themselves, the properties are versioned. Optionally, they may not be versioned, so that a specific property only applies to a single revision of a file. Properties may be useful for some sort of internal management. If you practice peer reviews, then using properties is a good way to indicate that a specific revision of a file has been peer reviewed. Assign a property to a file with the svn propset command. You specify a key, then its value, and finally where to apply the property: > svn propset myproperty "property value" trunk/web/home.cfm The only restrictions are on the property key. Subversion uses XML internally to manage properties, so the key must be a valid XML NAME. Loosely, an XML NAME is a string containing alphanumeric characters, periods, hyphens, underscores, and commas. Like changes to the working copy, properties are not automatically changed on the repository. They must be committed using svn commit.

Another use of BEGIN blocks is to preconfigure a module before we use it. For example, the AnyDBM_File module allows us to reconfigure its @ISA array by writing something like the following: BEGIN { @AnyDBM_File::ISA = qw(GDBM_File SDBM_File); } use AnyDBM_File; Inside the module, the code simply checks to see if the variable is defined before supplying a default definition: our @ISA = qw(NDBM_File DB_File GDBM_File SDBM_File ODBM_File) unless @ISA; It is vital that we put our definition in a BEGIN block so that it is executed and takes effect before the use statement is processed. Without this, the implicit BEGIN block of the use statement would cause the module to be loaded before our definition is established despite the fact it appears first in the source.

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