I am trying to figure out how to reorganize an array..
I have a multidimensional array(Ill call that original_array) and I would like to take the first array within original_array and set the values as keys in a new array. I also want to take the values of the second array in original_array and make them keys and then set the values of the third array in original_array as the values for those keys.
Here is an example of original_array:
Array (
[id] => Array (
[0] => 1
[1] => 3
)
[reward] => Array (
[0] => Movie
[1] => Trip
)
[cost] => Array (
[0] => 50
[1] => 200
)
)
Basically what I would like to do is look like this:
Array (
[1] => Array (
[Movie] => 50
)
[3] => Array (
[Trip] => 200
)
)
Is there a simple and elegant way to merge these like this?
I have spent hours trying to figure this out using array_merge, array_merge_recursive.. etc. And have search SO far and wide for a similar questions, but I haven't found anything that does what I am after.
I was able to correctly combine the 2nd and 3rd arrays in original_array with array_combine. But, I am at a loss as how to combine that result with the 1st array's values in original_array.
Thanks in advance to any help!
Well, the dirty way would be just use combine array functions like array_combine with the input:
$new_array = array_combine(
$array['id'], // parent keys
// combine chunked combined sub keys :p
array_chunk(array_combine($array['reward'], $array['cost']), 1, true)
);
There may be some incantation of array_*() merging functions that could produce what you're looking for, but it is far easier to just iterate over the original array's [id] sub-array and use its values to create new sub-array keys in a different output array.
// To hold your output
$output = array();
// Iterate the original array's [id] sub-array
foreach ($original['id'] as $idxkey => $newkey) {
// Add a sub-array using $newkey to the output array
$output[$newkey] = array(
// Using the index (not value), retrieve the corresponding reward
// value to use as the new array key
// and corresponding cost to use as the new subarray value
$original['reward'][$idxkey] => $original['cost'][$idxkey]
);
}
Here is a demonstration: https://3v4l.org/2pac3
This should work for you:
First you can get the keys for the main array into a separate variable with array_shift(), which will just remove the first element from your array, which is the array holding the keys.
Then use array_map() to loop through both of your subArrays and use reward as key with the cost values as value and return it in an array. At the end you just have to array_combine() your keys $keys with the new created array.
Code:
<?php
$keys = array_shift($arr);
$result = array_combine($keys, array_map(function($k, $v){
return [$k => $v];
}, $arr["reward"], $arr["cost"]));
print_r($result);
?>
You might wanna take a look at BaseArrayHelper from Yii 2.0 Framework.
Although this file is part of a framework it has only very few dependencies and you should be able to use just this file or parts of it in your code with small modifications.
An example for your use case can be found in the index() method.
Related
I need to change array value based on specific value. Take a look at this array below :
Array
(
[0] => Array
(
[id] => 5
[title] =>
[nomor] => 1
)
[1] => Array
(
[id] => 6
[title] =>
[nomor] => 2
)
)
I need to change the array key based on nomor value. How can I do that?
You can use array_column for that (doc) as:
$arr = array_column($arr, null, "nomor");
Live example
The easiest way is to simply create a new array, loop through your existing one, and save each elements into the new one with the proper key.
foreach($array as $element) {
$formatted_array[$element['nomor']] = $element;
}
Here is a working fiddle:
https://3v4l.org/PlbJ1
Edit: Keep in mind though, if multiple elements have the same value as "nomor", the latest will override the previous one.
Edit 2: Per the other answer, PHP's array_column function seems to do this simpler.
Very simplified example:
function returnArray() {
return array('First','Second','Third');
}
$arr = array('hello','world');
$arr[] = returnArray();
print_r($arr);
I was (wrongly) expecting to see $arr containing 5 elements, but it actually contains this (and I understand it makes sense):
Array
(
[0] => hello
[1] => world
[2] => Array
(
[0] => First
[1] => Second
[2] => Third
)
)
Easily enough, I "fixed" it using a temporary array, scanning through its elements, and adding the elements one by one to the $arr array.
But I guess/hope that there must be a way to tell PHP to add the elements automatically one by one, instead of creating a "child" array within the first one, right? Thanks!
You can use array_merge,
$arr = array_merge($arr, returnArray());
will result in
Array
(
[0] => hello
[1] => world
[2] => First
[3] => Second
[4] => Third
)
This will work smoothly here, since your arrays both have numeric keys. If the keys were strings, you’d had to be more careful (resp. decide if that would be the result you want, or not), because
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
You are appending the resulting array to previously created array. Instead of the use array merge.
function returnArray() {
return array('First','Second','Third');
}
$arr = array('hello','world');
$arr = array_merge($arr, returnArray());
print_r($arr);
I'm getting started with PHP and I have some troubles finding a way to output values from multiples arrays sent from an external site.
I did a foreach and the code that is printed looks like this :
Array
(
[id] => 1
[title] => Title 1
)
Array
(
[id] => 2
[title] => Title 2
)
Array
(
[id] => 3
[title] => Title 3
)
Any idea how I could get every id (1,2,3) in an echo?
Let me know if you need more informations!
Thanks a lot!
If you just want to echo all the id's in all the arrays, a simple solution would be:
foreach ([$array1, $array2, $array3] as $arr) {
echo $arr['id'];
}
A better solution would probably to create one main array first:
$mainArray = [];
and every time you get a new array, you just push them to the main array:
$mainArray[] = $array1;
$mainArray[] = $array2;
// ... and so on
Then you'll have a multi dimensional array and can loop them with:
foreach ($mainArray as $arr) {
echo $arr['id'];
}
Which solution that works best depends on how you get the arrays and how many they are.
Note: Using array_merge() as others have suggested will not work in this case, since all the arrays have the same keys. From the documentation on array_merge(): "If the input arrays have the same string keys, then the later value for that key will overwrite the previous one."
As you can do:
$array = array_merge_recursive($arr1, $arr2, $arr3);
var_dump($newArray['id']);
echo implode(",", $newArray['id']);
A demo code is here
The above searching I want with minimum number of code and with best serach performance.
I want to generate an array from this above array by putting logic like:
ALL "EMA" key values of array should not be allowed to match with "JACKSON" key values. Similarly all "JACKSON" key values of the same array are not allowed to fall in any value of "EMA" key. So the resulting array would be like shown below:
Array
(
[0] => Array
(
[EMA] => A
[JACKSON] => B
)
[2] => Array
(
[EMA] => D
[JACKSON] => E
)
)
I want to know the best approach with lesser code to achieve this. The method I have used seems so lengthy. I want a shorter and robust approach.
I think this might be a solution:
$emas = array();
$jacksons = array();
foreach($array as $element){
$emas[] = $element['EMA'];
$jacksons[] = $element['JACKSON'];
}
//array_intersect returns the common values in the arrays as an array
if(!empty(array_intersect($emas, $jacksons))){
echo 'array is invalid!';
}
I'm trying to figure out why it is that I cannot access the follow array with this statement:
var_dump($thevar[0]['product_id']);
Array
(
[d142d425a5487967a914b6579428d64b] => Array
(
[product_id] => 253
[variation_id] =>
[variation] =>
[quantity] => 1
[data] => WC_Product Object
(
[id] => 253
[product_custom_fields] => Array
(
[_edit_last] => Array
(
[0] => 1
)
[_edit_lock] => Array
(
[0] => 1345655854:1
)
[_thumbnail_id] => Array
(
[0] => 102
)
I can, however, access the 'product_id' using the dynamically created array name:
print_r($thevar['d142d425a5487967a914b6579428d64b']['product_id']);
The issue is, I don't know what that dynamic name is going to be on the fly...
There are several options for such scenarios.
Manually iterate over the array
You can use reset, next, key and/or each to iterate over the array (perhaps partially).
For example, to grab the first item regardless of key:
$item = reset($thevar);
Reindex the array
Sometimes it's just convenient to be able to index into the array numerically, and a small performance hit is not a problem. In that case you can reindex using array_values:
$values = array_values($thevar);
$item = $values[0]; // because $values is numerically indexed
Iterate with foreach
This would work for a single value as well as it works for more, but it might give the wrong impression to readers of the code.
foreach($thevar as $item) {
// do something with $item
}
If the array key is dynamic you might find the PHP function array_keys() useful.
It will return an array of the keys used in an array. You can then use this to access a particular element in the array.
See here for more:
http://php.net/manual/en/function.array-keys.php
Because PHP array are associative therefor you have to access them by key.
But you may use reset($thevar) to get first item.
Or array_values():
array_values($thevar)[0]
Or if you feel like overkill you may also use array_keys() and use the [0] element to address element like this:
$thevar[ array_keys($thevar)[0]]