$arr = array(5 => 1, 12 => 2);
$arr[] = 56;    // This is the same as $arr[13] = 56;
                // at this point of the script
$arr["x"] = 42; // This adds a new element to
                // the array with key "x"
unset($arr[5]); // This removes the element from the array
unset($arr);    // This deletes the whole array
?> 
<?php
class foo
{
    function do_foo()
    {
        echo "Doing foo.";
    }
}

$bar = new foo;
$bar->do_foo();
?> 

<?php
$arr1=array(100,200,300,400);
$arr2=array("num"=>100,"name"=>"Liuxy","score"=>98);
print_r($arr1);
echo "<br>";
print_r($arr2);
?>


以上代码的输出结果如下：
Array ( [0] => 100 [1] => 200 [2] => 300 [3] => 400 ) 
Array ( [num] => 100 [name] => Liuxy [score] => 98 )