I have a big associative array with over 1 000 items and I want to rename one key but the order must be preserved.
I don't wont to iterate over the complete array and copy it into a new.
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1possible duplicate of [In PHP, how do you change the key of an array element?](http://stackoverflow.com/questions/240660/in-php-how-do-you-change-the-key-of-an-array-element) – Lawrence Cherone Mar 30 '12 at 12:41
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You know the value of the key or you know the index of the key you want to change or both? – hakre Jun 21 '12 at 10:26
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I only know the key name, not the index position – mabe.berlin Jun 25 '12 at 10:18
4 Answers
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have a look at the array_splice function: http://php.net/manual/en/function.array-splice.php
this will do the job
Fender
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$array_keys = array_keys($array);
$array_keys[array_search('old', $array_keys)] = 'new';
$array = array_combine($array_keys, $array);
Michael
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This is working but it copy's all keys into a new array which allocates much RAM on big arrays – mabe.berlin Mar 30 '12 at 12:56
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Unfortunately I think any solution is going to involve the creation of (a) new array(s). I'd love to be wrong here. – Michael Mar 30 '12 at 13:14
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From PHP's C-level it should be possible - but can't find a function to do so :( – mabe.berlin Mar 30 '12 at 13:23
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$array[$newkeyname] = $array[$oldkeyname];
unset($array[$oldkeyname]);
bendataclear
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This is the same answer as one above, it doesn't answer the question. This does not preserve the order of the array. – David Barker Mar 30 '12 at 12:52
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