PHP rename array keys in multidimensional array - php

Question

In an array such as the one below, how could I rename "fee_id" to "id"?
Array
(
[0] => Array
(
[fee_id] => 15
[fee_amount] => 308.5
[year] => 2009
)
[1] => Array
(
[fee_id] => 14
[fee_amount] => 308.5
[year] => 2009
)
)

Answer 1

foreach ( $array as $k=>$v )
{
$array[$k] ['id'] = $array[$k] ['fee_id'];
unset($array[$k]['fee_id']);
}
This should work

Answer 2

You could use array_map() to do it.
$myarray = array_map(function($tag) {
return array(
'id' => $tag['fee_id'],
'fee_amount' => $tag['fee_amount'],
'year' => $tag['year']
); }, $myarray);

Answer 3

$arrayNum = count($theArray);
for( $i = 0 ; $i < $arrayNum ; $i++ )
{
$fee_id_value = $theArray[$i]['fee_id'];
unset($theArray[$i]['fee_id']);
$theArray[$i]['id'] = $fee_id_value;
}
This should work.

Answer 4

Copy the current 'fee_id' value to a new key named 'id' and unset the previous key?
foreach ($array as $arr)
{
$arr['id'] = $arr['fee_id'];
unset($arr['fee_id']);
}
There is no function builtin doing such thin afaik.

Answer 5

This is the working solution, i tested it.
foreach ($myArray as &$arr) {
$arr['id'] = $arr['fee_id'];
unset($arr['fee_id']);
}

Answer 6

The snippet below will rename an associative array key while preserving order (sometimes... we must). You can substitute the new key's $value if you need to wholly replace an item.
$old_key = "key_to_replace";
$new_key = "my_new_key";
$intermediate_array = array();
while (list($key, $value) = each($original_array)) {
if ($key == $old_key) {
$intermediate_array[$new_key] = $value;
}
else {
$intermediate_array[$key] = $value;
}
}
$original_array = $intermediate_array;

Answer 7

Converted 0->feild0, 1->field1,2->field2....
This is just one example in which i get comma separated value in string and convert it into multidimensional array and then using foreach loop i changed key value of array
<?php
$str = "abc,def,ghi,jkl,mno,pqr,stu
abc,def,ghi,jkl,mno,pqr,stu
abc,def,ghi,jkl,mno,pqr,stu
abc,def,ghi,jkl,mno,pqr,stu;
echo '<pre>';
$arr1 = explode("\n", $str); // this will create multidimensional array from upper string
//print_r($arr1);
foreach ($arr1 as $key => $value) {
$arr2[] = explode(",", $value);
foreach ($arr2 as $key1 => $value1) {
$i =0;
foreach ($value1 as $key2 => $value2) {
$key3 = 'field'.$i;
$i++;
$value1[$key3] = $value2;
unset($value1[$key2]);
}
}
$arr3[] = $value1;
}
print_r($arr3);
?>

Answer 8

I wrote a function to do it using objects or arrays (single or multidimensional) see at https://github.com/joaorito/php_RenameKeys.
Bellow is a simple example, you can use a json feature combine with replace to do it.
// Your original array (single or multi)
$original = array(
'DataHora' => date('YmdHis'),
'Produto' => 'Produto 1',
'Preco' => 10.00,
'Quant' => 2);
// Your map of key to change
$map = array(
'DataHora' => 'Date',
'Produto' => 'Product',
'Preco' => 'Price',
'Quant' => 'Amount');
$temp_array = json_encode($original);
foreach ($map AS $k=>$v) {
$temp_array = str_ireplace('"'.$k.'":','"'.$v.'":', $temp);
}
$new_array = json_decode($temp, $array);

Answer 9

Multidimentional array key can be changed dynamically by following function:
function change_key(array $arr, $keySetOrCallBack = [])
{
$newArr = [];
foreach ($arr as $k => $v) {
if (is_callable($keySetOrCallBack)) {
$key = call_user_func_array($keySetOrCallBack, [$k, $v]);
} else {
$key = $keySetOrCallBack[$k] ?? $k;
}
$newArr[$key] = is_array($v) ? array_change_key($v, $keySetOrCallBack) : $v;
}
return $newArr;
}
Sample Example:
$sampleArray = [
'hello' => 'world',
'nested' => ['hello' => 'John']
];
//Change by difined key set
$outputArray = change_key($sampleArray, ['hello' => 'hi']);
//Output Array: ['hi' => 'world', 'nested' => ['hi' => 'John']];
//Change by callback
$outputArray = change_key($sampleArray, function($key, $value) {
return ucwords(key);
});
//Output Array: ['Hello' => 'world', 'Nested' => ['Hello' => 'John']];

Answer 10

I have been trying to solve this issue for a couple hours using recursive functions, but finally I realized that we don't need recursion at all. Below is my approach.
$search = array('key1','key2','key3');
$replace = array('newkey1','newkey2','newkey3');
$resArray = str_replace($search,$replace,json_encode($array));
$res = json_decode($resArray);
On this way we can avoid loop and recursion.
Hope It helps.