When I var_dump on a variable called $tags (a multidimensional array) I get this:
Array ( [0] => Array ( [name] => tabbing [url] => tabbing ) [1] => Array ( [name] => tabby ridiman [url] => tabby-ridiman ) [2] => Array ( [name] => tables [url] => tables ) [3] => Array ( [name] => tabloids [url] => tabloids ) [4] => Array ( [name] => taco bell [url] => taco-bell ) [5] => Array ( [name] => tacos [url] => tacos ) )
I would like to rename all array keys called "url" to be called "value". What would be a good way to do this?
This question is related to
php
This should work in most versions of PHP 4+. Array map using anonymous functions is not supported below 5.3.
Also the foreach examples will throw a warning when using strict PHP error handling.
Here is a small multi-dimensional key renaming function. It can also be used to process arrays to have the correct keys for integrity throughout your app. It will not throw any errors when a key does not exist.
function multi_rename_key(&$array, $old_keys, $new_keys)
{
if(!is_array($array)){
($array=="") ? $array=array() : false;
return $array;
}
foreach($array as &$arr){
if (is_array($old_keys))
{
foreach($new_keys as $k => $new_key)
{
(isset($old_keys[$k])) ? true : $old_keys[$k]=NULL;
$arr[$new_key] = (isset($arr[$old_keys[$k]]) ? $arr[$old_keys[$k]] : null);
unset($arr[$old_keys[$k]]);
}
}else{
$arr[$new_keys] = (isset($arr[$old_keys]) ? $arr[$old_keys] : null);
unset($arr[$old_keys]);
}
}
return $array;
}
Usage is simple. You can either change a single key like in your example:
multi_rename_key($tags, "url", "value");
or a more complex multikey
multi_rename_key($tags, array("url","name"), array("value","title"));
It uses similar syntax as preg_replace() where the amount of $old_keys and $new_keys should be the same. However when they are not a blank key is added. This means you can use it to add a sort if schema to your array.
Use this all the time, hope it helps!
Very simple approach to replace keys in a multidimensional array, and maybe even a bit dangerous, but should work fine if you have some kind of control over the source array:
$array = [ 'oldkey' => [ 'oldkey' => 'wow'] ];
$new_array = json_decode(str_replace('"oldkey":', '"newkey":', json_encode($array)));
print_r($new_array); // [ 'newkey' => [ 'newkey' => 'wow'] ]
It is from duplicated question
$json = '[
{"product_id":"63","product_batch":"BAtch1","product_quantity":"50","product_price":"200","discount":"0","net_price":"20000"},
{"product_id":"67","product_batch":"Batch2","product_quantity":"50","product_price":"200","discount":"0","net_price":"20000"}
]';
$array = json_decode($json, true);
$out = array_map(function ($product) {
return array_merge([
'price' => $product['product_price'],
'quantity' => $product['product_quantity'],
], array_flip(array_filter(array_flip($product), function ($value) {
return $value != 'product_price' && $value != 'product_quantity';
})));
}, $array);
var_dump($out);
class DataHelper{
private static function __renameArrayKeysRecursive($map = [], &$array = [], $level = 0, &$storage = []) {
foreach ($map as $old => $new) {
$old = preg_replace('/([\.]{1}+)$/', '', trim($old));
if ($new) {
if (!is_array($new)) {
$array[$new] = $array[$old];
$storage[$level][$old] = $new;
unset($array[$old]);
} else {
if (isset($array[$old])) {
static::__renameArrayKeysRecursive($new, $array[$old], $level + 1, $storage);
} else if (isset($array[$storage[$level][$old]])) {
static::__renameArrayKeysRecursive($new, $array[$storage[$level][$old]], $level + 1, $storage);
}
}
}
}
}
/**
* Renames array keys. (add "." at the end of key in mapping array if you want rename multidimentional array key).
* @param type $map
* @param type $array
*/
public static function renameArrayKeys($map = [], &$array = [])
{
$storage = [];
static::__renameArrayKeysRecursive($map, $array, 0, $storage);
unset($storage);
}
}
Use:
DataHelper::renameArrayKeys([
'a' => 'b',
'abc.' => [
'abcd' => 'dcba'
]
], $yourArray);
foreach ($basearr as &$row)
{
$row['value'] = $row['url'];
unset( $row['url'] );
}
unset($row);
Loop through, set new key, unset old key.
foreach($tags as &$val){
$val['value'] = $val['url'];
unset($val['url']);
}
Talking about functional PHP, I have this more generic answer:
array_map(function($arr){
$ret = $arr;
$ret['value'] = $ret['url'];
unset($ret['url']);
return $ret;
}, $tag);
}
Recursive php rename keys function:
function replaceKeys($oldKey, $newKey, array $input){
$return = array();
foreach ($input as $key => $value) {
if ($key===$oldKey)
$key = $newKey;
if (is_array($value))
$value = replaceKeys( $oldKey, $newKey, $value);
$return[$key] = $value;
}
return $return;
}
This is how I rename keys, especially with data that has been uploaded in a spreadsheet:
function changeKeys($array, $new_keys) {
$newArray = [];
foreach($array as $row) {
$oldKeys = array_keys($row);
$indexedRow = [];
foreach($new_keys as $index => $newKey)
$indexedRow[$newKey] = isset($oldKeys[$index]) ? $row[$oldKeys[$index]] : '';
$newArray[] = $indexedRow;
}
return $newArray;
}
Source: Stackoverflow.com