The difference between php associative array and index array

In PHP, an array is a collection of a series of data, forming an operable whole. Each data is an element, and the element contains a key name and a key value.

The difference between index array and associative array is distinguished by key name

1. Index array (Recommended learning: PHP video tutorial)

<?php
    $arr = array(&#39;华为&#39;,&#39;三星&#39;,&#39;vivo&#39;,&#39;oppo&#39;);
    print_r($arr);
    echo &#39;<br/><br/><br/>&#39;;
    echo &#39;数组 $arr 中的，键名为2的键值为：&#39;.$arr[2];
?>

The results show:

2. Associative array

<?php
    $arr1 = array(&#39;Apple&#39; => &#39;苹果&#39;,&#39;Banana&#39; => &#39;香蕉&#39;,&#39;Orange&#39; => &#39;橘子&#39;,&#39;Plum&#39; => &#39;李子&#39;,&#39;Strawberry&#39; => &#39;草莓&#39;);
    print_r($arr1);
?>

The result shows:

Arrays with numbers as key names are generally called index arrays and associative arrays The key values ​​are strings and are artificially specified.

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