How to change array index name in php

In PHP, you can use the array_combine() function to change the array index name. This function can use the element value of another array as the index (key) of the original array, thereby changing the index; the syntax "array_combine($ keys,$arr)".

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

How to change the array in php Index name

For example, there is an array like this:

$arr=array("red","green","blue","yellow");

How to modify its index name (key name)?

In PHP, you can use the array_combine() function to achieve this.

array_combine() function creates a new array by merging two arrays, where the elements of one array are key names and the elements of the other array are key values.

We only need to create a key name array, which contains the modified index name, and then the original array is used as the key value array, and the two arrays can be merged using array_combine().

Note: The number of elements in the key name array and the key value array must be the same!

Example:

The key name array is:

$keys=array("a","b","c","d");

Use the array_combine() function to replace the key name of the $arr array with the value of the $keys array:

<!--?php
header("Content-type:text/html;charset=utf-8");
$arr=array("red","green","blue","yellow");
var_dump($arr);
$keys=array("a","b","c","d");
echo "使用array_combine()替换键名后:";
var_dump(array_combine($keys,$arr));
?-->

Recommended learning: "PHP Video Tutorial", "PHP ARRAY"

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