I have an array of objects and I need to convert to key value pairs, my code is
i have a model as: model setting.php
public function currency_info[]{
$currency_info = [
['code' => 'AED', 'name' => 'United Arab Emirates Dirham'],
['code' => 'ANG', 'name' => 'NL Antillian Guilder'],
['code' => 'ARS', 'name' => 'Argentine Peso'],
['code' => 'AUD', 'name' => 'Australian Dollar'],
['code' => 'BRL', 'name' => 'Brazilian Real'],
]
}
and controller as:
SettingController.php
public function index[]
{
$setting = new Setting[];
$currency_list = $setting->currency_info[];
$result = [];
foreach [$currency_list as $currency] {
$result[$currency->code] = $currency->name;
}
return $result;
}
i get the following error:
ErrorException [E_NOTICE] Trying to get property 'code' of non-object
Where am I doing wrong and how can I correct this?
[PHP 4, PHP 5, PHP 7, PHP 8]
array_keys — Return all the keys or a subset of the keys of an array
Description
array_keys[array $array]: array
array_keys[array $array,
mixed $search_value, bool $strict = false]: array
If a search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the array are returned.
Parameters
arrayAn array containing keys to return.
search_valueIf specified, then only keys containing this value are returned.
strictDetermines if strict comparison [===] should be used during the search.
Return Values
Returns an array of all the keys in array.
Examples
Example #1 array_keys[] example
The above example will output:
Array
[
[0] => 0
[1] => color
]
Array
[
[0] => 0
[1] => 3
[2] => 4
]
Array
[
[0] => color
[1] => size
]
See Also
- array_values[] - Return all the values of an array
- array_combine[] - Creates an array by using one array for keys and another for its values
- array_key_exists[] - Checks if the given key or index exists in the array
- array_search[] - Searches the array for a given value and returns the first corresponding key if successful
pat dot leblanc at gmail dot com ¶
11 years ago
It's worth noting that if you have keys that are long integer, such as '329462291595', they will be considered as such on a 64bits system, but will be of type string on a 32 bits system.
for example:
will return on a 64 bits system:
but on a 32 bits system:
I hope it will save someone the huge headache I had :]
Sven [bitcetera.com] ¶
16 years ago
Here's how to get the first key, the last key, the first value or the last value of a [hash] array without explicitly copying nor altering the original array:
phpnet at holodyn dot com ¶
8 years ago
Since 5.4 STRICT standards dictate that you cannot wrap array_keys in a function like array_shift that attempts to reference the array.
Invalid:
echo array_shift[ array_keys[ array['a' => 'apple'] ] ];
Valid:
$keys = array_keys[ array['a' => 'apple'] ];
echo array_shift[ $keys ];
But Wait! Since PHP [currently] allows you to break a reference by wrapping a variable in parentheses, you can currently use:
echo array_shift[ [ array_keys[ array['a' => 'apple'] ] ] ];
However I would expect in time the PHP team will modify the rules of parentheses.
Robert C. ¶
6 years ago
Keys from multi dimensional array to simple array
Want to traverse an multi dimensional array and get the keys back in a single dimensional array? This will do the trick:
el dot quick at gmail dot com ¶
11 years ago
Sorry for my english...
I wrote a function to get keys of arrays recursivelly...
I hope it will be usefull
Regards
jochem ¶
16 years ago
might be worth noting in the docs that not all associative [string] keys are a like, output of the follow bit of code demonstrates - might be a handy introduction to automatic typecasting in php for some people [and save a few headaches]: