PHP Multidimensional Array

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

Example

<?php
 // 二維數(shù)組:
 $cars = array
 (
     array("Volvo",100,96),
     array("BMW",60,59),
     array("Toyota",110,100)
 );
 ?>

PHP - Multidimensional Array

A multidimensional array contains a or Array of multiple 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.

Example

In this example, we create a multi-dimensional array with automatically assigned ID keys:

Example

<?php 
 $sites = array 
 ( 
     "php"=>array 
     ( 
         "php中文網(wǎng)", 
         "http://miracleart.cn" 
     ), 
     "google"=>array 
     ( 
         "Google 搜索", 
         "http://www.google.com" 
     ), 
     "taobao"=>array 
     ( 
         "淘寶", 
         "http://www.taobao.com" 
     ) 
 ); 
 print("<pre>"); // 格式化輸出數(shù)組 
 print_r($sites); 
 print("</pre>"); 
 ?>

The above array will be output as follows ：

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?

’s ’ :' . $sites['php'][1];

The above code will output:

Multidimensional array

The multidimensional array refers to is an array containing one or more arrays.

1. One-dimensional array There are no other arrays in the array, only some variables or values.

2. A single-layer array or multiple arrays are inserted into a two-dimensional array array

3. A three-dimensional array inserts an array (B) into the array (A), and Another level of array (C) is inserted into the B array, which we call a three-dimensional array

4. Anything with more than three dimensions is called a multi-dimensional array.

Difficulties in learning multi-dimensional arrays:

Pay attention to the format and tidy up the line breaks and indentations of each dimension. It’s not easy to make mistakes.

【Remember】

The separator between array elements is a comma. When inserting an array into an array, do not write a semicolon (;) at the end