How to modify the keys of an array in php

In PHP, you cannot directly modify the keys of an array. You can only copy the elements one by one to another new array, and modify the key names when assigning values. The syntax is such as "$b[0] = $a['a'];$b[1] = $a['b'];$b[2] = $a['c'];$a = $b;".

php Modify the key of the array:

You cannot directly modify the key name of an array in PHP, you can only modify it through Copy the elements one by one to another new array, and modify the key name when assigning, such as;

$a = array('a'=>'China', 'b'=>'America', 'c'=>'England');
$b[0] = $a['a'];
$b[1] = $a['b']
$b[2] = $a['c'];
$a = $b;

The result is $a with the content: array(0=>'China', 1= >'America', 2=>'England');

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