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The vars pragma merely tells Perl that we are going to be making use of the named package variable; it has no useful effect if strict variables are not enabled Unfortunately, it does not allow us to declare and assign to the variable at the same time use vars '$variable'; $variable = "value"; The our keyword does, however It declares a package variable, but only makes it visible lexically, just like my our $variable = "value"; The our keyword is intended as an improved, more intuitive replacement for use vars, but we often see the latter in older Perl code and code designed to run on a wide range of Perl versions So what about local It provides the ability to temporarily hide a package variable with another variable of the same name, but holding a different value.

A time of 6.9 seconds ouch, that s not very good. It s going to take a long time for our article administrator to page through all the articles if this is the query that is feeding his admin screen. So let s look at our slow query log.

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Somewhat counterintuitively, the scope of the variable is lexical, so it persists only while the interpreter is executing code within the file or block in which it is declared However, it is visible from anywhere so long as this remains true, notably within called subroutines This isn t what most people are expecting, and is why my is usually what we want to use In fact, local is most useful for temporarily overriding Perl s built-in variables, which are really special cases of package variables Scope and visibility are important concepts, so it is worth taking a moment to look at them a little more closely before the end of the chapter..

The scope and visibility of a variable is determined by its nature, package or lexical, and where in a piece of code it resides. As we mentioned, Perl has two distinct types of variable in terms of scope: package variables, which are visible from anywhere in a program, and lexical variables, whose scope and visibility is constrained to the file or block in which they are first declared.

The cfpresentationslide tag takes up to 12 different attributes For this example, I am going to use a simple HTML-based slide and add only a slide title, myself as a presenter, notes, and a duration of 15 seconds (see Listing 33-3) Listing 33-3 Creating a Slide <cfpresentationslide title="my First Slide" presenter="Wally Kolcz" notes="This is my first slide" duration="15"> Hello World Welcome to my first presentation and slide! </cfpresentationslide> Anything in between the beginning and ending cfpresentationslide tags is included in your slide It can use normal HTML markup, CSS, images, dynamic data with cfquery or query of queries, charts and graphs, and more Anything that can be put on a normal HTML/CFML page can be added to the slide If you don t specify the font size, the presentation reduces the size of the font to fit inside the slide area.

In the following example, the first mention of $scalar is a package variable. Because it exists at the top of the program and is not in a declared package, it is also what we traditionally think of as a global variable. Inside the block, we have a second $scalar. This one is declared to be a lexical variable through the use of the my keyword. The lexical variable obscures the package global within the block, but as soon as the block finishes, the original package variable reappears. #!/usr/bin/perl # scope.pl our $scalar = "global"; print "\$scalar is a $scalar variable\n"; { my $scalar = "lexical"; print "\$scalar is now a $scalar variable\n"; } print "\$scalar is a $scalar variable again\n"; When we run this program, we get the following output: > perl scope.pl

$scalar is a global variable $scalar is now a lexical variable $scalar is a global variable again The subject of package and lexical variables is simple at first glance, rather more complex on closer examination. We can declare package variables lexically with our or hide one package variable with another using local, which differs from the my example earlier because its visibility would persist until execution leaves the block. We tackle all this in more detail in 8.

# Time: 101103 23:03:00 # User@Host: root[root] @ localhost [] # Query_time: 6.920107 Lock_time: 0.000111 Rows_sent: 10 Rows_examined: 123675 SET timestamp=1288796580; select article_title from articles order by article_title limit 10;

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