数组能够在单独的变量名中存储一个或多个值。

数组类型：

1、数值数组带有数字 ID 键的数组2、关联数组数组中的每个 ID 键关联一个值3、多维数组包含一个或多个数组的数组

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数值数组-->数值数组存储的每个元素都带有一个数字 ID 键

eg:

$names = array("Peter","Quagmire","Joe"); $names[0] = "Peter"; $names[1] = "Quagmire"; $names[2] = "Joe"; <?php $names[0] = "Peter"; $names[1] = "Quagmire"; $names[2] = "Joe"; echo $names[1] . " and " . $names[2] . " are ". $names[0] . "'s neighbors"; ?>

输出：

Quagmire and Joe are Peter's neighbors

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关联数组-->每个 ID 键都关联一个值

$ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34); <?php $ages['Peter'] = "32"; $ages['Quagmire'] = "30"; $ages['Joe'] = "34"; echo "Peter is " . $ages['Peter'] . " years old."; ?>

输出：

Peter is 32 years old.

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多维数组-->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

$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 ) )

显示上面的数组中的一个单一的值：

echo "Is " . $families['Griffin'][2] . " a part of the Griffin family?";

输出：

Is Megan a part of the Griffin family?