Home  >  Article  >  Backend Development  >  PHP数组实例详解,php数组详解_PHP教程

PHP数组实例详解,php数组详解_PHP教程

WBOY
WBOYOriginal
2016-07-12 08:49:22899browse

PHP数组实例详解,php数组详解

作为一名C++程序员,在转做PHP开发的过程中,对PHP数组产生了一些混淆,与C++数组有相似的地方,也有一些不同,下面就全面地分析一下PHP的数组及其与C++中相应数据类型的区别和联系。

数组的分类:

1、数值数组:也叫索引数组,即以数字(从0 开始)作为数组下标。相当于C++中的vector。

2、关联数组:以字符串作为数组下标。相当于C++中的map。

3、多维数组:数组中每个元素也是一个数组。其子数组中的每个元素也可以是数组。

数组的声明:

1、数值数组

a、如下例子中,会自动分配数字ID键。

$names = array("Peter","Joe","Lily");
b、如下例子中,我们人工分配数字ID键。

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

可以在脚本中使用这些ID键:

<&#63;php 
$names[0] = "Peter"; 
$names[1] = "Joe"; 
$names[2] = "Lily"; 
echo $names[0]." and ".$names[1]." are ".$names[2]."'s neighbors"; 
/* 何问起 hovertree.com */
&#63;> 

2、关联数组:

例子1

$ages = array("Peter"=>32, "Joe"=>30, "Lily"=>28);

例子2

本例与例子1相同,只是另一种创建数组的方法。

$ages["Peter"] = "32"; 
$ages["Joe"] = "30"; 
$ages["Lily"] = "28"; 

在脚本中使用关联数组:

<?php 
$ages["Peter"] = "32"; 
$ages["Joe"] = "30"; 
$ages["Lily"] = "28"; 
echo "Peter is ".$ages["Peter"]." years old."; 
/* 何问起 hovertree.com */
?> 

以上脚本输出:

Peter is 32 years old.

3、多维数组:

在本例中,我们创建了一个带有自动分配数字ID键的多维数组:

$families = array 
{ 
"Griffin"=>array 
{ 
"Peter", 
"Lois", 
"Megan" 
}, 
"Quagmire"=>array 
{ 
"Glenn" 
}, 
"Brown"=>array 
{ 
"Cleveland", 
"Loretta", 
"Junior" 
} 
}; 
echo "Is " . $families['Griffin'][2] . " a part of the Griffin family&#63;"; 

以上代码输出:

Is Megan a part of the Griffin family?

1、for循环遍历

for循环只能遍历索引数组。

<&#63;php 
$names = array("Peter","Joe","Lily"); 
for($id=0;$id<count($names);++$id) 
{ 
echo $names[$id]; 
} 
&#63;> 

2、foreach遍历

即可以遍历索引数组,也可以遍历关联数组

遍历索引数组

foreach(array_expression as $value) 
{ 
循环体; 
} 
遍历关联数组 
foreach(array_expression as $key=>$value) 
{ 
循环体; 
} 

A、一维数组遍历

索引数组

<&#63;php 
$contact = array("李某","xx公司","abc@xx.com"); 
foreach($contact as $value) 
{ 
echo $value; 
} 
&#63;> 
<&#63;php 
$contact = array("姓名"=>"李某","公司"=>"xx公司","邮箱"=>"abc@xx.com"); 
foreach($contact as $key=>$value) 
{ 
echo $key.":".$value; 
} 
&#63;> 

B、多维数组遍历

<&#63;php 
$wage = array( 
"市场部"=array( 
array(1,"李某","市场经理",8000), 
array(2,"王某","市场专员",5000), 
array(3,"刘某","市场专员",7000) 
), 
"产品部"=array( 
array(1,"李某","产品经理",9000), 
array(2,"王某","产品专员",6000), 
array(3,"刘某","产品专员",5000) 
), 
"账务部"=array( 
array(1,"李某","账务经理",7000), 
array(2,"王某","账务专员",6000), 
array(3,"刘某","账务专员",5000) 
) 
); 
foreach($wage as $section=>$table) 
{ 
echo $section."部门人员如下"; 
foreach($table as $row) 
{ 
foreach($row as $value) 
{ 
echo $value; 
} 
} 
} /* 何问起 hovertree.com */
&#63;> 

以上所述是小编给大家介绍的php数组的实例详解,希望对大家有所帮助。

www.bkjia.comtruehttp://www.bkjia.com/PHPjc/1138975.htmlTechArticlePHP数组实例详解,php数组详解 作为一名C++程序员,在转做PHP开发的过程中,对PHP数组产生了一些混淆,与C++数组有相似的地方,也有一些不...
Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn