How to modify the key value of an array in php?

php method to modify the key value of an array: first use range to generate an array of a specified range; then use [array_combine] to combine the keys and values ​​to form a new array, the code is [$keys = range(2, 4 );$arr = array_combine($keys)].

php method to modify the key value of the array:

There is a method that does not use a loop, the code is as follows

'one',2=>'two',3=>'three');
$keys = range(2, 4);
$arr = array_combine($keys, array_values($arr));

Among them, range generates an array within the specified range, array_combine combines keys and values ​​to form a new array.

In actual application, please use it in combination with the original array length.

Please do this when using loops

'one',2=>'two',3=>'three');
for ($i = count($arr)+1; $i > 1; --$i) {
    $arr[$i] = $arr[$i-1];
}
unset($arr[$i]);

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