On 21 May 2010 13:34, <cr.vegelin@xxxxxxxxx> wrote:
>
> ----- Original Message ----- From: "Richard Quadling"
> <rquadling@xxxxxxxxxxxxxx>
> To: <cr.vegelin@xxxxxxxxx>
> Cc: <php-general@xxxxxxxxxxxxx>
> Sent: Friday, May 21, 2010 1:30 PM
> Subject: Re: how to update array keys and keep element order ?
>
>
>> On 21 May 2010 10:56, <cr.vegelin@xxxxxxxxx> wrote:
>>>
>>> How do I update an array key without disturbing the element order ?
>>> Suppose an existing array("FR", values ...)
>>> where I want to change 0 => "FR" to "country" => "FR"
>>> and keep the original element order.
>>>
>>> TIA, Cor
>>>
>>
>> Something like ...
>>
>> function arrayKeyChange(array &$array, $oldKey, $newKey) {
>> if (!array_key_exists($oldKey, $array)) {
>> trigger_error('Requested key does not exist.', E_USER_WARNING);
>> return False;
>> }
>> if (array_key_exists($oldKey, $array) && array_key_exists($newKey,
>> $array)) {
>> trigger_error('Will result in duplicate keys.', E_USER_WARNING);
>> return False;
>> }
>>
>> // Split keys/values
>> $keys = array_keys($array);
>> $values = array_values($array);
>>
>> // Find position of oldKey
>> $oldKeyPos = array_search($oldKey, $keys, True);
>>
>> // Replace key
>> $keys[$oldKeyPos] = $newKey;
>>
>> // Combine keys/values
>> $array = array_combine($keys, $values);
>>
>> return True;
>> }
>
> Thanks Richard,
>
> I will check your solution. I tried the following:
>
> function ar_replacekeys ($array, $replacements)
> {
> foreach ($array as $key => $value) // 1)
> {
> foreach ($replacements as $oldkey => $newkey)
> {
> if ($key == $oldkey)
> {
> $array[$newkey] = $value; // 2)
> unset($array[$key]); // 2)
> }
> }
> }
> }
>
> Works fine, except that replaced elements are placed at the end. (2)
> Also tested: foreach ($array as &$key => $value) (1)
> but this gave "Key element cannot be a reference"
>
>
>
>
<?php
function arrayKeyChange(...){...} // As previously supplied.
$arr = array('Continent'=>'Europe', 'FR', 'Currency'=>'Euro');
arrayKeyChange($arr, 0, 'country');
arrayKeyChange($arr, 'country', 'Country');
print_r($arr);
?>
outputs ...
Array
(
[Continent] => Europe
[Country] => FR
[Currency] => Euro
)
--
-----
Richard Quadling
"Standing on the shoulders of some very clever giants!"
EE : http://www.experts-exchange.com/M_248814.html
EE4Free : http://www.experts-exchange.com/becomeAnExpert.jsp
Zend Certified Engineer : http://zend.com/zce.php?c=ZEND002498&r=213474731
ZOPA : http://uk.zopa.com/member/RQuadling
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
