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<?php
// foreach は便利
$array = array ("year" => 2010, "month" => 9, "day" => 27);
foreach ($array as $key => $value)
    echo "$key: $value\n";

// こうすると perl っぽい
while (list ($key, $value) = each ($array))
    echo "$key: $value\n";
?>

# たとえば、keys が返すキーの配列を foreach で列挙
%hash = ("year" => 2010, "month" => 9, "day" => 27);
foreach $key (keys %hash1)
    print "$key: $hash{$key}\n";

# 順番を確定したければキーをソートするといい
foreach $key (sort keys %hash1)
    print "$key: $hash{$key}\n";

# たとえばキーと値を each で列挙
while (($key, $value) = each (%hash1))
    print "$key: $value\n";