What are the two types of php arrays based on index?

Index array

Arrays with numbers as key names are generally called index arrays. An array whose keys are represented by strings is an associative array that will be introduced below. The keys of the index array are integers and start from 0 and so on.

Index array initialization example:

<pre name="code" class="php"><?php  
//创建一个索引数组，索引数组的键是“0”，值是“苹果”  
$fruit=array("苹果","香蕉");  
print_r($fruit);  
?>

Running result

Array
(
    [0] => 苹果
    [1] => 香蕉
)

Associative array

In fact, associative array The difference from the index array is only in the key value. The key value of the associative array is a string, and it is an artificial regulation, for example:

<?php  
//创建一个关联数组，关联数组的键“orange”，值是“橘子”  
$fruit=array(&#39;orange&#39;=>&#39;橘子&#39;);  
echo $fruit[&#39;orange&#39;];  
?>

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