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例子 1

在这个例子中,会自动分配 ID 键:

$names = array("Peter","Quagmire","Joe");

例子 2

在这个例子中,我们人工分配的 ID 键:

$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";

可以在脚本中使用这些 ID 键:

<?php

$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";

echo $names[1] . " and " . $names[2] . " are ". $names[0] . "'s neighbors";
?>

以上代码的输出:

Quagmire and Joe are Peter's neighbors

关联数组

关联数组,它的每个 ID 键都关联一个值。

在存储有关具体命名的值的数据时,使用数值数组不是最好的做法。

通过关联数组,我们可以把值作为键,并向它们赋值。
例子 1

在本例中,我们使用一个数组把年龄分配给不同的人:

$ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34);

例子 2

本例与例子 1 相同,不过展示了另一种创建数组的方法:

$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";

可以在脚本中使用 ID 键:

<?php

$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";

echo "Peter is " . $ages['Peter'] . " years old.";
?>

以上脚本的输出:

Peter is 32 years old.

多维数组

在多维数组中,主数组中的每个元素也是一个数组。在子数组中的每个元素也可以是数组,以此类推。
例子 1

在本例中,我们创建了一个带有自动分配的 ID 键的多维数组:

$families = array
(
  "Griffin"=>array
  (
  "Peter",
  "Lois",
  "Megan"
  ),
  "Quagmire"=>array
  (
  "Glenn"
  ),
  "Brown"=>array
  (
  "Cleveland",
  "Loretta",
  "Junior"
  )
);

如果输出这个数组的话,应该类似这样:

Array
(
[Griffin] => Array
  (
  [0] => Peter
  [1] => Lois
  [2] => Megan
  )
[Quagmire] => Array
  (
  [0] => Glenn
  )
[Brown] => Array
  (
  [0] => Cleveland
  [1] => Loretta
  [2] => Junior
  )
)












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