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)

'; echo '数组 $arr 中的，键名为2的键值为：'.$arr[2]; ?>

The results show:

2. Associative array

 '苹果','Banana' => '香蕉','Orange' => '橘子','Plum' => '李子','Strawberry' => '草莓'); 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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