PHP数组

一、定义数组:arry()函数用于创建数组

  • 数值数组-带有数字ID键的数组
  • 关联数组-带有指定键的数组,每个键关联一个值
  • 多维数组-包含一个或多个数组的数组

1、数值数组

(1)、$cars=arry("","BMW","Toyota");

         或   $cars[0]="Volvo"     $cars[1]="BMW"     $cars[2]="Toyota"

<?php
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>

(2)、获取数组的长度-count()函数

<?php
$cars=array("Volvo","BMW","Toyota");
echo count($cars);
?>

运行结果:3

(3)、遍历数值数组

<?php
$cars=arry("Volvo","BMW","Toyota");
$arrlength=count($cars);
for($x=0;$x<$arrlength;$x++){
   echo $cars[$x];
   echo "<br>"
}

运行结果为:Volvo

                    BMW

                    Toyota

2、关联数组

(1)、创建关联数组

       $age=arry("Peter"=>"35","Ben"=>"37","Joe"=>"43");

  或 $age['Peter']="35"    $age['Ben']="37"    $age['Joe']="43"

例:

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
echo "Peter is " . $age['Peter'] . " years old.";
?>

运行结果为:Peter is 35 years old.

(2)、遍历关联数组

<?php
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
 
foreach($age as $x=>$x_value)
{
    echo "Key=" . $x . ", Value=" . $x_value;
    echo "<br>";
}
?>

3、多维数组

<?php
// 二维数组:
$cars = array
(
    array("Volvo",100,96),
    array("BMW",60,59),
    array("Toyota",110,100)
);
?>

自动分配ID键

<?php 
$sites = array 
( 
    "runoob"=>array 
    ( 
        "菜鸟教程", 
        "http://www.runoob.com" 
    ), 
    "google"=>array 
    ( 
        "Google 搜索", 
        "http://www.google.com" 
    ), 
    "taobao"=>array 
    ( 
        "淘宝", 
        "http://www.taobao.com" 
    ) 
); 
print("<pre>"); // 格式化输出数组 
print_r($sites); 
print("</pre>"); 
?>

输出结果:

让我们试着显示上面数组中的某个值:

echo $sites['runoob'][0] . '地址为:' . $sites['runoob'][1];

上面的代码将输出:


文章来源: PHP数组

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