frog.raindrop.jp.knowledge

<?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";

for ($i = 0; $i < 10; $i ++)
    echo "$i\n";

for ($i = 0; $i < 10; $i ++)
    print "$i\n";

for (var i = 0; i < 10; i ++)
    document.writeln (i);

$array1 = array ("foo", "bar", "baz");
foreach ($array1 as $value)
    echo "$value\n";

$array2 = array ("year" => 2010, "month" => 9, "day" => 27);
foreach ($array1 as $key => $value)
    echo "$key: $value\n";

@array1 = ("foo", "bar", "baz");
foreach $value (@array1)
    print "$value\n";

%hash1 = ("year" => 2010, "month" => 9, "day" => 27);
foreach $key (keys %hash1)
    print "$key: $hash1{$key}\n";

# 実は for と foreach は同様に使える。インタプリタが文脈で判断するので。
@array2 = qw (apple peach banana);
for $value (@array2)
    print "$value\n";

// for ( in ) を配列で使用した場合は添字を列挙
var array = ["foo", "bar", "baz"];
for (var index in array)
    document.writeln (array [index]);

// 連想配列で使用した場合はキーを列挙
var hash = {year: 2010, month: 9, day: 27};
for (var key in hash)
    document.writeln (key + ': ' + hash [key]);