How to write a two-dimensional array in php

php How to write a two-dimensional array: 1. Direct assignment method, syntax "$array[one-dimensional subscript][two-dimensional subscript]="value";"; 2. Use the array() function, Syntax "array(array(key=>value...),array(key=>value...)....)".

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

two-dimensional array

The two-dimensional array is declared in the same way as the one-dimensional array, except that one or more elements in the array are also declared as an array. There are also two declarations: directly assigning values ​​to the array elements and using the array() function. 2 Dimensional array methods.

The following uses the method of directly assigning values ​​​​to the array elements to declare an array. The sample code is as follows:

<?php
    $array[0][&#39;name&#39;] = &#39;zhangsan&#39;;
    $array[0][&#39;chinese&#39;] = &#39;89&#39;;
    $array[0][&#39;math&#39;] = &#39;95&#39;;
    $array[0][&#39;english&#39;] = &#39;88&#39;;
    $array[1][&#39;name&#39;] = &#39;lisi&#39;;
    $array[1][&#39;chinese&#39;] = &#39;91&#39;;
    $array[1][&#39;math&#39;] = &#39;86&#39;;
    $array[1][&#39;english&#39;] = &#39;90&#39;;
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    print_r($array);
?>

The running results are as follows:

Array
(
    [0] => Array
        (
            [name] => zhangsan
            [chinese] => 89
            [math] => 95
            [english] => 88
        )
    [1] => Array
        (
            [name] => lisi
            [chinese] => 91
            [math] => 86
            [english] => 90
        )
)

Use the array() function to declare a two-dimensional Arrays are similar to declaring one-dimensional arrays. The sample code is as follows: (The following code is equivalent to the above code, and the running results are the same)

<?php
    $array = array(
        array(&#39;name&#39;=>&#39;zhangsan&#39;,&#39;chinese&#39;=>&#39;89&#39;,&#39;math&#39;=>&#39;95&#39;,&#39;english&#39;=>&#39;88&#39;),
        array(&#39;name&#39;=>&#39;lisi&#39;,&#39;chinese&#39;=>&#39;91&#39;,&#39;math&#39;=>&#39;86&#39;,&#39;english&#39;=>&#39;90&#39;)
    );
    echo &#39;<pre class="brush:php;toolbar:false">&#39;;
    print_r($array);
?>

Similarly, getting the elements in the two-dimensional array is also the same as the one-dimensional array Similarly, you only need to indicate the subscript of each dimension. The sample code is as follows:

<?php
    $array = array(
        array(&#39;name&#39;=>&#39;zhangsan&#39;,&#39;chinese&#39;=>&#39;89&#39;,&#39;math&#39;=>&#39;95&#39;,&#39;english&#39;=>&#39;88&#39;),
        array(&#39;name&#39;=>&#39;lisi&#39;,&#39;chinese&#39;=>&#39;91&#39;,&#39;math&#39;=>&#39;86&#39;,&#39;english&#39;=>&#39;90&#39;)
    );
    echo $array[0][&#39;name&#39;].&#39;同学的数学考了&#39;.$array[0][&#39;math&#39;].&#39;分&#39;;
?>

The running results are as follows:

zhangsan同学的数学考了95分

Tip: Different dimensions of the array indicate how many dimensions we need to use Subscript (index) is used to obtain the corresponding array element. For example, a two-dimensional array requires two subscripts to obtain the corresponding array element, a three-dimensional array requires three, and so on.

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