PHP数组的用法

<?php
$paper[] = "Copier";
$paper[] = "Inkjet";
$paper[0] = "Copier";
$paper[1] = "Inkjet";
print_r($paper);
for ($j = 0 ; $j < 4 ; ++$j)
    echo "$j: $paper[$j]<br>";

$paper['copier'] = "Copier & Multipurpose";
$paper['inkjet'] = "Inkjet Printer";
$paper['laser']  = "Laser Printer";
$paper['photo']  = "Photographic Paper";
echo $paper['laser'];

$p1 = array("Copier", "Inkjet", "Laser", "Photo");
echo "p1 element: " . $p1[2] . "<br>";
$p2 = array('copier' => "Copier & Multipurpose",
            'inkjet' => "Inkjet Printer",
            'laser'  => "Laser Printer",
            'photo'  => "Photographic Paper");
echo "p2 element: " . $p2['inkjet'] . "<br>";
foreach ($paper as $item => $description)
    echo "$item: $description<br>";
while (list($item, $description) = each($paper))
    echo "$item: $description<br>";
echo "<pre>";
foreach ($products as $section => $items)
    foreach ($items as $key => $value)
        echo "$section:\t$key\t($value)<br>";
echo "</pre>";

$paper = array("Copier", "Inkjet", "Laser", "Photo");
$j = 0;
foreach ($paper as $item)
{
    echo "$j: $item<br>";
    ++$j;
}

$temp = explode(' ', "This is a sentence with seven words");
$temp = explode('***', "A***sentence***with***asterisks");
print_r($temp);

$fname   = "Elizabeth";
$sname   = "Windsor";
$address = "Buckingham Palace";
$city    = "London";
$country = "United Kingdom";
$contact = compact('fname', 'sname', 'address', 'city', 'country');
print_r($contact);

$j       = 23;
$temp    = "Hello";
$address = "1 Old Street";
$age     = 61;
print_r(compact(explode(' ', 'j temp address age')));

?>