Deep talk on php multidimensional arrays

The values ​​in one array can be another array, and the values ​​in another array can also be an array. In this way, we can create a two-dimensional or three-dimensional array:

Example

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

PHP - Multidimensional Array

Multidimensional array is An array containing one or more arrays.

In a multi-dimensional array, each element in the main array can also be an array, and each element in the sub-array can also be an array.

In this example, we create a multidimensional array with automatically assigned ID keys:

<?php 
$sites = array 
( 
    "runoob"=>array 
    ( 
        "php中文网", 
        "http://www.php.cn" 
    ), 
    "google"=>array 
    ( 
        "Google 搜索", 
        "http://www.google.com" 
    ), 
    "taobao"=>array 
    ( 
        "淘宝", 
        "http://www.taobao.com" 
    ) 
); 
print("<pre class="brush:php;toolbar:false">"); // 格式化输出数组 
print_r($sites); 
print("

");  ?>

The above array will output the following:

Example 2

Let us try to display a value in the above array:

echo $sites ['runoob'][0] . 'The address is:' . $sites['runoob'][1];

Methods for multi-dimensional array traversal

$a=array('fruits'=>array('a'=>'orange','b'=>'grape',c=>'apple'),
 'numbers'=>array(1,2,3,4,5,6),
 'holes'=>array('first',5=>'second','third')
 );
//第一种：
foreach($a as $list=>$things){
 if(is_array($things)){
 foreach($things as $newlist=>$counter){
 echo "key:".$newlist."<br/>"."value:".$counter."<br/>";
 }
}
}
//第二种:
function MulitarraytoSingle($array){
   $temp=array();
   if(is_array($array)){
     foreach ($array as $key=>$value )
     {
       if(is_array($value)){
         MulitarraytoSingle($value);
       }
       else{
         $temp[]=$value;
       }
     }
   }
}

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