In PHP, how do you change the key of an array element?

php arrays associative-array
Thomas Owens picture Thomas Owens · Oct 27, 2008 · Viewed 438.6k times · Source

I have an associative array in the form key => value where key is a numerical value, however it is not a sequential numerical value. The key is actually an ID number and the value is a count. This is fine for most instances, however I want a function that gets the human-readable name of the array and uses that for the key, without changing the value.

I didn't see a function that does this, but I'm assuming I need to provide the old key and new key (both of which I have) and transform the array. Is there an efficient way of doing this?

Answer

KernelM picture KernelM · Oct 27, 2008 
$arr[$newkey] = $arr[$oldkey];
unset($arr[$oldkey]);

Related questions

Adding an item to an associative array

//go through each question foreach($file_data as $value) { //separate the string by pipes and place in variables list($category, $question) = explode('|', $value); //place in assoc array $data = array($category => $question); print_r($data); } This is not …

Read More
Display array values in PHP

So, I'm working with PHP for the first time and I am trying to retrieve and display the values of an array. After a lot of googling, the only methods I can find for this are print_r, var_dump …

Read More
Fastest way to implode an associative array with keys

I'm looking for a fast way to turn an associative array in to a string. Typical structure would be like a URL query string but with customizable separators so I can use '&' for xhtml links or …

Read More