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localising variables

localising variables

localising variables

I saw this piece of code in subroutine and the comment said something about localising the variable.

local($check_referer) = 0;

What does localising a variable do?

my test site

RE: localising variables

Hi Will,

You often see this kind of thing at the beginning of a subroutine.

local ($_) = @_;

This code gives you a local version of $_ in your subroutine. You can change the contents of $_ there without having to worry about clobbering $_ in your main program or other subroutines.

Use local for things like $_, predefined Perl variables.

Use my for your own variables that you want to be private to that subroutine, like this.

my ($param1, $param2) = @_;

to pick up the subroutines parameters or:

my ($i, $a, $x)=(0,0,0);

to create and initialise some local variables or just

my $local_var;

to create a local variable.

Anyway - long answer so hope it helps.


Cargill's Corporate Web Site
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