PHP数组详解

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：  
<?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 */
?>  

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. 

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?";  
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。  
<?php  
    $names = array("Peter","Joe","Lily");  
    for($id=0;$id<count($names);++$id)  
    {  
        echo $names[$id];  
    }  
?>  
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  
<?php  
    $contact = array("李某","xx公司","abc@xx.com");  
    foreach($contact as $value)  
    {  
        echo $value;  
    }  
?>  
  
<?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;  
    }  
?>  
  
B、多维数组遍历  
<?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 */
?>