単独の変数の参照
$num = 10;
print $num;

$str = "this is a pen.";
print $str;

配列の要素の参照
@str = ("this", "is", "a", "pen" );
print $str[2];

@str = ("this", "is", "a", "pen" );

@str = ("this", "is", "a", "pen" );
$num = @str;
print $num;

4

注意
@str = ("this", "is", "a", "pen" );
print @str;

thisisapen

リスト表現と配列
@str1 = ("this", "is", "a", "pen" );
@str2 = ( "who", "are", "you" );
@str3 = ( @str1, @str2 );
foreach( @str3 ) {
	print "$_ ";
}

this is a pen who are you

配列の中身を捨てて空にする
@str = ();

配列の要素数の最大値
@str = ("this", "主語", "is", "動詞", "a", "冠詞", "pen", "名詞" );
print "$#str<br>";
print $str[$#str];

7
名詞

%str = ("this", "主語", "is", "動詞", "a", "冠詞", "pen", "名詞" );
while ( ($key,$val) = each %str ) {
	print $str{"$key"} . "<br>";
}

名詞
主語
動詞
冠詞