Is it possible to modify array keys in php?

php can modify array keys. Modification method: 1. Use the "array_values ​​(array)" statement to change the string keys in the array to numeric keys; 2. Use "array_combine (key name array, original array)" to replace the keys of the original array with keys The number of elements in the name array, the key array and the original array must be the same.

The operating environment of this tutorial: windows7 system, PHP version 7.1, DELL G3 computer

php can modify the array key. The modification method is as follows:

1. Use the array_values() function

array_values() function can convert an associative array into an index array, that is, the string in the array keys to numeric keys.

<?php
$arr=array("Peter"=>65,"Harry"=>80,"John"=>78,"Clark"=>90);
var_dump($arr);
var_dump(array_values($arr));
?>

2. Use array_combine() function

array_combine() function can create a new array by merging two arrays , one of the array elements is the key name, and the other array element is the key value. The number of elements in the key array and the key value array must be the same.

In other words, this function can replace the keys of the original array with elements in the key array.

Example:

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr=array("red","green","blue","yellow");
echo "原数组：";
var_dump($arr);

echo "键名数组：";
$key=array("a","b","c","d");
var_dump($key);

echo "修改键后的数组：";
$arr2 = array_combine($key,$arr);
var_dump($arr2);
?>

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