Related
How can I add all the columnar values by associative key? Note that key sets are dynamic.
Input array:
Array
(
[0] => Array
(
[gozhi] => 2
[uzorong] => 1
[ngangla] => 4
[langthel] => 5
)
[1] => Array
(
[gozhi] => 5
[uzorong] => 0
[ngangla] => 3
[langthel] => 2
)
[2] => Array
(
[gozhi] => 3
[uzorong] => 0
[ngangla] => 1
[langthel] => 3
)
)
Desired result:
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
You can use array_walk_recursive() to get a general-case solution for your problem (the one when each inner array can possibly have unique keys).
$final = array();
array_walk_recursive($input, function($item, $key) use (&$final){
$final[$key] = isset($final[$key]) ? $item + $final[$key] : $item;
});
Example with array_walk_recursive() for the general case
Also, since PHP 5.5 you can use the array_column() function to achieve the result you want for the exact key, [gozhi], for example :
array_sum(array_column($input, 'gozhi'));
Example with array_column() for the specified key
If you want to get the total sum of all inner arrays with the same keys (the desired result that you've posted), you can do something like this (bearing in mind that the first inner array must have the same structure as the others) :
$final = array_shift($input);
foreach ($final as $key => &$value){
$value += array_sum(array_column($input, $key));
}
unset($value);
Example with array_column() in case all inner arrays have the same keys
If you want a general-case solution using array_column() then at first you may consider to get all unique keys , and then get the sum for each key :
$final = array();
foreach($input as $value)
$final = array_merge($final, $value);
foreach($final as $key => &$value)
$value = array_sum(array_column($input, $key));
unset($value);
Example with array_column() for the general case
$sumArray = array();
foreach ($myArray as $k=>$subArray) {
foreach ($subArray as $id=>$value) {
isset($sumArray[$id]) || $sumArray[$id] = 0;
$sumArray[$id]+=$value;
}
}
print_r($sumArray);
Use this snippet:
$key = 'gozhi';
$sum = array_sum(array_column($array,$key));
Here is a solution similar to the two others:
$acc = array_shift($arr);
foreach ($arr as $val) {
foreach ($val as $key => $val) {
$acc[$key] += $val;
}
}
But this doesn’t need to check if the array keys already exist and doesn’t throw notices neither.
It can also be done using array_map :
$rArray = array(
0 => array(
'gozhi' => 2,
'uzorong' => 1,
'ngangla' => 4,
'langthel' => 5
),
1 => array(
'gozhi' => 5,
'uzorong' => 0,
'ngangla' => 3,
'langthel' => 2
),
2 => array(
'gozhi' => 3,
'uzorong' => 0,
'ngangla' => 1,
'langthel' => 3
),
);
$sumResult = call_user_func_array('array_map', array_merge(['sum'], $rArray));
function sum()
{
return array_sum(func_get_args());
}
$newarr=array();
foreach($arrs as $value)
{
foreach($value as $key=>$secondValue)
{
if(!isset($newarr[$key]))
{
$newarr[$key]=0;
}
$newarr[$key]+=$secondValue;
}
}
Another version, with some benefits below.
$sum = ArrayHelper::copyKeys($arr[0]);
foreach ($arr as $item) {
ArrayHelper::addArrays($sum, $item);
}
class ArrayHelper {
public function addArrays(Array &$to, Array $from) {
foreach ($from as $key=>$value) {
$to[$key] += $value;
}
}
public function copyKeys(Array $from, $init=0) {
return array_fill_keys(array_keys($from), $init);
}
}
I wanted to combine the best of Gumbo's, Graviton's, and Chris J's answer with the following goals so I could use this in my app:
a) Initialize the 'sum' array keys outside of the loop (Gumbo). Should help with performance on very large arrays (not tested yet!). Eliminates notices.
b) Main logic is easy to understand without hitting the manuals. (Graviton, Chris J).
c) Solve the more general problem of adding the values of any two arrays with the same keys and make it less dependent on the sub-array structure.
Unlike Gumbo's solution, you could reuse this in cases where the values are not in sub arrays. Imagine in the example below that $arr1 and $arr2 are not hard-coded, but are being returned as the result of calling a function inside a loop.
$arr1 = array(
'gozhi' => 2,
'uzorong' => 1,
'ngangla' => 4,
'langthel' => 5
);
$arr2 = array(
'gozhi' => 5,
'uzorong' => 0,
'ngangla' => 3,
'langthel' => 2
);
$sum = ArrayHelper::copyKeys($arr1);
ArrayHelper::addArrays($sum, $arr1);
ArrayHelper::addArrays($sum, $arr2);
It can also be done using array_walk:
function array_sum_values(array $input, $key) {
$sum = 0;
array_walk($input, function($item, $index, $params) {
if (!empty($item[$params[1]]))
$params[0] += $item[$params[1]];
}, array(&$sum, $key)
);
return $sum;
}
var_dump(array_sum_values($arr, 'gozhi'));
Not so readable like previous solutions but it works :)
Go through each item of the array and sum values to previous values if they exist, if not just assign the value.
<?php
$array =
[
[
'a'=>1,
'b'=>1,
'c'=>1,
],
[
'a'=>2,
'b'=>2,
],
[
'a'=>3,
'd'=>3,
]
];
$result = array_reduce($array, function($carry, $item) {
foreach($item as $k => $v)
$carry[$k] = $v + ($carry[$k] ?? 0);
return $carry;
}, []);
print_r($result);
Output:
Array
(
[a] => 6
[b] => 3
[c] => 1
[d] => 3
)
Or just loop through each sub array, and group the values for each column. Eventually summing them:
foreach($array as $subarray)
foreach($subarray as $key => $value)
$grouped[$key][] = $value;
$sums = array_map('array_sum', $grouped);
Here's a version where the array keys may not be the same for both arrays, but you want them all to be there in the final array.
function array_add_by_key( $array1, $array2 ) {
foreach ( $array2 as $k => $a ) {
if ( array_key_exists( $k, $array1 ) ) {
$array1[$k] += $a;
} else {
$array1[$k] = $a;
}
}
return $array1;
}
We need to check first if array key does exist.
CODE:
$sum = array();
foreach ($array as $key => $sub_array) {
foreach ($sub_array as $sub_key => $value) {
//If array key doesn't exists then create and initize first before we add a value.
//Without this we will have an Undefined index error.
if( ! array_key_exists($sub_key, $sum)) $sum[$sub_key] = 0;
//Add Value
$sum[$sub_key]+=$value;
}
}
print_r($sum);
OUTPUT With Array Key Validation:
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
OUTPUT Without Array Key Validation:
Notice: Undefined index: gozhi in F:\web\index.php on line 37
Notice: Undefined index: uzorong in F:\web\index.php on line 37
Notice: Undefined index: ngangla in F:\web\index.php on line 37
Notice: Undefined index: langthel in F:\web\index.php on line 37
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
This is a bad practice although it prints the output. Always check first if key does exist.
Simple example with array_reduce()
$numbers = [10,20,30];
$total = 0;
foreach ($numbers as $number) {
$total += $number;
}
echo $total; // 60
=>
$numbers = [10,20,30];
$total = array_reduce($numbers, function ($previous, $current) {
return $previous + $current;
});
echo $total; // 60
With assoc array:
$carts = [
['item' => 'A', 'qty' => 2, 'price' => 10],
['item' => 'B', 'qty' => 3, 'price' => 20],
['item' => 'C', 'qty' => 5, 'price' => 30]
];
$total = array_reduce(
$carts,
function ($prev, $item) {
return $prev + $item['qty'] * $item['price'];
}
);
echo $total; // 155
More info => https://www.phptutorial.net/php-tutorial/php-array_reduce/
For those who landed here and are searching for a solution that merges N arrays AND also sums the values of identical keys found in the N arrays, I've written this function that works recursively as well. (See: https://gist.github.com/Nickology/f700e319cbafab5eaedc)
Example:
$a = array( "A" => "bob", "sum" => 10, "C" => array("x","y","z" => 50) );
$b = array( "A" => "max", "sum" => 12, "C" => array("x","y","z" => 45) );
$c = array( "A" => "tom", "sum" => 8, "C" => array("x","y","z" => 50, "w" => 1) );
print_r(array_merge_recursive_numeric($a,$b,$c));
Will result in:
Array
(
[A] => tom
[sum] => 30
[C] => Array
(
[0] => x
[1] => y
[z] => 145
[w] => 1
)
)
Here's the code:
<?php
/**
* array_merge_recursive_numeric function. Merges N arrays into one array AND sums the values of identical keys.
* WARNING: If keys have values of different types, the latter values replace the previous ones.
*
* Source: https://gist.github.com/Nickology/f700e319cbafab5eaedc
* #params N arrays (all parameters must be arrays)
* #author Nick Jouannem <nick#nickology.com>
* #access public
* #return void
*/
function array_merge_recursive_numeric() {
// Gather all arrays
$arrays = func_get_args();
// If there's only one array, it's already merged
if (count($arrays)==1) {
return $arrays[0];
}
// Remove any items in $arrays that are NOT arrays
foreach($arrays as $key => $array) {
if (!is_array($array)) {
unset($arrays[$key]);
}
}
// We start by setting the first array as our final array.
// We will merge all other arrays with this one.
$final = array_shift($arrays);
foreach($arrays as $b) {
foreach($final as $key => $value) {
// If $key does not exist in $b, then it is unique and can be safely merged
if (!isset($b[$key])) {
$final[$key] = $value;
} else {
// If $key is present in $b, then we need to merge and sum numeric values in both
if ( is_numeric($value) && is_numeric($b[$key]) ) {
// If both values for these keys are numeric, we sum them
$final[$key] = $value + $b[$key];
} else if (is_array($value) && is_array($b[$key])) {
// If both values are arrays, we recursively call ourself
$final[$key] = array_merge_recursive_numeric($value, $b[$key]);
} else {
// If both keys exist but differ in type, then we cannot merge them.
// In this scenario, we will $b's value for $key is used
$final[$key] = $b[$key];
}
}
}
// Finally, we need to merge any keys that exist only in $b
foreach($b as $key => $value) {
if (!isset($final[$key])) {
$final[$key] = $value;
}
}
}
return $final;
}
?>
Here you have how I usually do this kind of operations.
// We declare an empty array in wich we will store the results
$sumArray = array();
// We loop through all the key-value pairs in $myArray
foreach ($myArray as $k=>$subArray) {
// Each value is an array, we loop through it
foreach ($subArray as $id=>$value) {
// If $sumArray has not $id as key we initialize it to zero
if(!isset($sumArray[$id])){
$sumArray[$id] = 0;
}
// If the array already has a key named $id, we increment its value
$sumArray[$id]+=$value;
}
}
print_r($sumArray);
You can try this:
$c = array_map(function () {
return array_sum(func_get_args());
},$a, $b);
and finally:
print_r($c);
this works great on my laravel project
print_r($Array); // your original array
$_SUM = [];
// count($Array[0]) => if the number of keys are equall in all arrays then do a count of index 0 etc.
for ($i=0; $i < count($Array[0]); $i++) {
$_SUM[] = $Array[0][$i] + $Array[1][$i]; // do a for loop on the count
}
print_r($_SUM); // get a sumed up array
$sumArray = array();
foreach ($myArray as $k => $subArray) {
foreach ($subArray as $id => $value) {
if (!isset($sumArray[$id])) {
$sumArray[$id] = 0;
}
$sumArray[$id]+=$value;
}
}
$sumArray = array();
foreach ($myArray as $k=>$subArray) {
foreach ($subArray as $id=>$value) {
if(!isset($sumArray[$id])){
$sumArray[$id] =$value;
}else {
$sumArray[$id]+=$value;
}
}
}
print_r($sumArray);
`
For example, you can pluck all fields from a result like this below.
I am picking out the 'balance' from an array and save to a variable
$kii = $user->pluck('balance');
then on the next line u can sum like this:
$sum = $kii->sum();
Hope it helps.
Code here:
$temp_arr = [];
foreach ($a as $k => $v) {
if(!is_null($v)) {
$sum = isset($temp_arr[$v[0]]) ? ((int)$v[5] + $sum) : (int)$v[5];
$temp_arr[$v[0]] = $sum;
}
}
return $temp_arr;
Result:
{SEQ_OK: 1328,SEQ_ERROR: 561}
I have an array.
$a = array(
0 => 1,
1 => 1,
2 => 2,
3 => 3,
4 => 1
);
How to get unique array like this?
$result = array_My_unique($a);
print_r($result);
Output:
$a = array(
0 => 1,
1 => 2,
2 => 3,
3 => 1
);
Thank!
Assuming you are trying to avoid duplicates that are immediately next to each other:
function array_my_unique($a = array()) {
$out = array();
$curr = false;
foreach ($a as $v) {
if ($curr !== $v) {
$out[] = $v;
}
$curr = $v;
}
return $out;
}
This satisfies the assertion between input/output that you described in the question.
I want to split an array in 2 pieces and add the first slice to the end. The point where it should splitten is set in another variable.
$where = 7;
$array = array( 1 => "aaa", 2 => "bbb", 7 => "ccc", 13 => "ddd", 20 => "eee" );
//...code...
//I'd like to have
$array = array(7 => "ccc", 13 => "ddd", 20 => "eee", 1 => "aaa", 2 => "bbb" );
How to achieve that?
foreach($array as $key=>$value)
{
if ($key === $where)
{
break;
}
unset($array[$key]);
$array[$key] = $value;
}
You can use array_slice() to split the array twice -->
$arr1 = array_slice($array, 0, $where-1);
$arr2 = array_slice($array, $where, count($array)-1);
$array = array();
$array[] = $arr2;
$array[] = $arr1;
function split_array($array, $where) {
$temp_array = array();
foreach ($array as $key => $value) {
if($key != $where) {
$temp_array[$key] = $value;
unset($array[$key]);
}
else {
break;
}
}
//return array_merge($array, $temp_array);
return ($array+$temp_array);
}
You can use array_slice() with a offset to split the array, and join the two chunks with the array union operator.
$where = 7;
$array = array( 1 => "aaa", 2 => "bbb", 7 => "ccc", 13 => "ddd", 20 => "eee" );
$offset = array_search($where, array_keys($array), true);
if ($offset !== false) {
$array = array_slice($array, $offset, null, true) + $array;
}
I have an array like this:
$arr = array(1, 1, 1, 2, 2, 3, 3, 1, 1, 2, 2, 3);
I found the function array_count_values(), but it will group all of the same values and count the occurrences without respecting breaks in the consecutive sequences.
$result[1] = 5
$result[2] = 4
$result[3] = 3
How can I group each set of consecutive values and count the length of each sequence? Notice there are two sets of sequences for the numbers 1, 2, and 3.
The data that I expect to generate needs to resemble this:
[1] = 3;
[2] = 2;
[3] = 2;
[1] = 2;
[2] = 2;
[3] = 1;
It can be done simply manually:
$arr = array(1,1,1,2,2,3,3,1,1,2,2,3);
$result = array();
$prev_value = array('value' => null, 'amount' => null);
foreach ($arr as $val) {
if ($prev_value['value'] != $val) {
unset($prev_value);
$prev_value = array('value' => $val, 'amount' => 0);
$result[] =& $prev_value;
}
$prev_value['amount']++;
}
var_dump($result);
My suggestion is to extract&remove the first value from the array prior to entering the loop and use a temporary array ($carry) to track whether each new value matches the key in the carry array. If so, increment it. If not, push the completed sequence count into the result array and overwrite the carry with the new value and set the counter to 1. When the loop finishes, push the lingering carry into the result set. My snippet does not check if the input array is empty; if necessary, add that condition to your project.
Code: (Demo)
$array = [1,1,1,2,2,3,3,1,1,2,2,3];
$result = [];
$carry = [array_shift($array) => 1];
foreach ($array as $value) {
if (isset($carry[$value])) {
++$carry[$value];
} else {
$result[] = $carry;
$carry = [$value => 1];
}
}
$result[] = $carry;
print_r($result);
Output: (condensed to reduce page bloat)
[
[1 => 3],
[2 => 2],
[3 => 2],
[1 => 2],
[2 => 2],
[3 => 1],
]
If you'd rather implement a zerkms-style, modify-by-reference style technique, the following snippet provides the same result as the above snippet.
Effectively, it pushes every newly encountered value as an associative, single-element array into the indexed result array. Because the pushed subarray is declared as a variable ($carry) then assigned-by-reference (= &) to the result array, incrementation of $carry will be applied to the deeply nested value in the result array. The output array requires the additional depth in its structure so that a given value which occurs multiple times can be reliably stored.
Code: (Demo)
$result = [];
$carry = [];
foreach ($array as $value) {
if ($carry && key($carry) === $value) {
++$carry[$value];
} else {
unset($carry);
$carry = [$value => 1];
$result[] = &$carry;
}
}
unset($carry);
print_r($result);
Unsetting the reference variable $carry after the loop may not be necessary, but if there is any potential re-use of that variable within the variable's scope, it will be important to uncouple the reference with unset().
And just for fun, here is a hideous regex-infused approach that works with the sample data: Demo
What about PHP's array_count_values function?
<?php
$array = array(1, "hello", 1, "world", "hello");
print_r(array_count_values($array));
?>
output:
Array
(
[1] => 2
[hello] => 2
[world] => 1
)
function findRepetitions($times, $array) {
$values = array_unique($array);
$counts = [];
foreach($values as $value) {
$counts[] = ['value' => $value, 'count' => 0];
}
foreach ($array as $value) {
foreach ($counts as $key => $count) {
if ($count['value'] === $value) {
$counts[$key]['count']++;
}
}
}
$repetitions = [];
foreach ($counts as $count) {
if ($count['count'] === $times) {
$repetitions[] = $count['value'];
}
}
return $repetitions;
}
$current = null;
foreach($your_array as $v) {
if($v == $current) {
$result[count($result)-1]++;
} else {
$result[] = 1;
$current = $v;
}
}
var_dump($result);
Here is the way that I would do it:
function SplitIntoGroups($array)
{
$toReturnArray = array();
$currentNumber = $array[0];
$currentCount = 1;
for($i=1; $i <= count($array); $i++)
{
if($array[$i] == $currentNumber)
{
$currentCount++;
}
else
{
$toReturnArray[] = array($currentNumber, $currentCount);
$currentNumber = $array[$i];
$currentCount = 1;
}
}
return $toReturnArray;
}
$answer = SplitIntoGroups(array(1,1,1,2,2,3,3,1,1,2,2,3));
for($i=0; $i<count($answer); $i++)
{
echo '[' . $answer[$i][0] . '] = ' . $answer[$i][1] . '<br />';
}
How can I add all the columnar values by associative key? Note that key sets are dynamic.
Input array:
Array
(
[0] => Array
(
[gozhi] => 2
[uzorong] => 1
[ngangla] => 4
[langthel] => 5
)
[1] => Array
(
[gozhi] => 5
[uzorong] => 0
[ngangla] => 3
[langthel] => 2
)
[2] => Array
(
[gozhi] => 3
[uzorong] => 0
[ngangla] => 1
[langthel] => 3
)
)
Desired result:
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
You can use array_walk_recursive() to get a general-case solution for your problem (the one when each inner array can possibly have unique keys).
$final = array();
array_walk_recursive($input, function($item, $key) use (&$final){
$final[$key] = isset($final[$key]) ? $item + $final[$key] : $item;
});
Example with array_walk_recursive() for the general case
Also, since PHP 5.5 you can use the array_column() function to achieve the result you want for the exact key, [gozhi], for example :
array_sum(array_column($input, 'gozhi'));
Example with array_column() for the specified key
If you want to get the total sum of all inner arrays with the same keys (the desired result that you've posted), you can do something like this (bearing in mind that the first inner array must have the same structure as the others) :
$final = array_shift($input);
foreach ($final as $key => &$value){
$value += array_sum(array_column($input, $key));
}
unset($value);
Example with array_column() in case all inner arrays have the same keys
If you want a general-case solution using array_column() then at first you may consider to get all unique keys , and then get the sum for each key :
$final = array();
foreach($input as $value)
$final = array_merge($final, $value);
foreach($final as $key => &$value)
$value = array_sum(array_column($input, $key));
unset($value);
Example with array_column() for the general case
$sumArray = array();
foreach ($myArray as $k=>$subArray) {
foreach ($subArray as $id=>$value) {
isset($sumArray[$id]) || $sumArray[$id] = 0;
$sumArray[$id]+=$value;
}
}
print_r($sumArray);
Use this snippet:
$key = 'gozhi';
$sum = array_sum(array_column($array,$key));
Here is a solution similar to the two others:
$acc = array_shift($arr);
foreach ($arr as $val) {
foreach ($val as $key => $val) {
$acc[$key] += $val;
}
}
But this doesn’t need to check if the array keys already exist and doesn’t throw notices neither.
It can also be done using array_map :
$rArray = array(
0 => array(
'gozhi' => 2,
'uzorong' => 1,
'ngangla' => 4,
'langthel' => 5
),
1 => array(
'gozhi' => 5,
'uzorong' => 0,
'ngangla' => 3,
'langthel' => 2
),
2 => array(
'gozhi' => 3,
'uzorong' => 0,
'ngangla' => 1,
'langthel' => 3
),
);
$sumResult = call_user_func_array('array_map', array_merge(['sum'], $rArray));
function sum()
{
return array_sum(func_get_args());
}
$newarr=array();
foreach($arrs as $value)
{
foreach($value as $key=>$secondValue)
{
if(!isset($newarr[$key]))
{
$newarr[$key]=0;
}
$newarr[$key]+=$secondValue;
}
}
Another version, with some benefits below.
$sum = ArrayHelper::copyKeys($arr[0]);
foreach ($arr as $item) {
ArrayHelper::addArrays($sum, $item);
}
class ArrayHelper {
public function addArrays(Array &$to, Array $from) {
foreach ($from as $key=>$value) {
$to[$key] += $value;
}
}
public function copyKeys(Array $from, $init=0) {
return array_fill_keys(array_keys($from), $init);
}
}
I wanted to combine the best of Gumbo's, Graviton's, and Chris J's answer with the following goals so I could use this in my app:
a) Initialize the 'sum' array keys outside of the loop (Gumbo). Should help with performance on very large arrays (not tested yet!). Eliminates notices.
b) Main logic is easy to understand without hitting the manuals. (Graviton, Chris J).
c) Solve the more general problem of adding the values of any two arrays with the same keys and make it less dependent on the sub-array structure.
Unlike Gumbo's solution, you could reuse this in cases where the values are not in sub arrays. Imagine in the example below that $arr1 and $arr2 are not hard-coded, but are being returned as the result of calling a function inside a loop.
$arr1 = array(
'gozhi' => 2,
'uzorong' => 1,
'ngangla' => 4,
'langthel' => 5
);
$arr2 = array(
'gozhi' => 5,
'uzorong' => 0,
'ngangla' => 3,
'langthel' => 2
);
$sum = ArrayHelper::copyKeys($arr1);
ArrayHelper::addArrays($sum, $arr1);
ArrayHelper::addArrays($sum, $arr2);
It can also be done using array_walk:
function array_sum_values(array $input, $key) {
$sum = 0;
array_walk($input, function($item, $index, $params) {
if (!empty($item[$params[1]]))
$params[0] += $item[$params[1]];
}, array(&$sum, $key)
);
return $sum;
}
var_dump(array_sum_values($arr, 'gozhi'));
Not so readable like previous solutions but it works :)
Go through each item of the array and sum values to previous values if they exist, if not just assign the value.
<?php
$array =
[
[
'a'=>1,
'b'=>1,
'c'=>1,
],
[
'a'=>2,
'b'=>2,
],
[
'a'=>3,
'd'=>3,
]
];
$result = array_reduce($array, function($carry, $item) {
foreach($item as $k => $v)
$carry[$k] = $v + ($carry[$k] ?? 0);
return $carry;
}, []);
print_r($result);
Output:
Array
(
[a] => 6
[b] => 3
[c] => 1
[d] => 3
)
Or just loop through each sub array, and group the values for each column. Eventually summing them:
foreach($array as $subarray)
foreach($subarray as $key => $value)
$grouped[$key][] = $value;
$sums = array_map('array_sum', $grouped);
Here's a version where the array keys may not be the same for both arrays, but you want them all to be there in the final array.
function array_add_by_key( $array1, $array2 ) {
foreach ( $array2 as $k => $a ) {
if ( array_key_exists( $k, $array1 ) ) {
$array1[$k] += $a;
} else {
$array1[$k] = $a;
}
}
return $array1;
}
We need to check first if array key does exist.
CODE:
$sum = array();
foreach ($array as $key => $sub_array) {
foreach ($sub_array as $sub_key => $value) {
//If array key doesn't exists then create and initize first before we add a value.
//Without this we will have an Undefined index error.
if( ! array_key_exists($sub_key, $sum)) $sum[$sub_key] = 0;
//Add Value
$sum[$sub_key]+=$value;
}
}
print_r($sum);
OUTPUT With Array Key Validation:
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
OUTPUT Without Array Key Validation:
Notice: Undefined index: gozhi in F:\web\index.php on line 37
Notice: Undefined index: uzorong in F:\web\index.php on line 37
Notice: Undefined index: ngangla in F:\web\index.php on line 37
Notice: Undefined index: langthel in F:\web\index.php on line 37
Array
(
[gozhi] => 10
[uzorong] => 1
[ngangla] => 8
[langthel] => 10
)
This is a bad practice although it prints the output. Always check first if key does exist.
Simple example with array_reduce()
$numbers = [10,20,30];
$total = 0;
foreach ($numbers as $number) {
$total += $number;
}
echo $total; // 60
=>
$numbers = [10,20,30];
$total = array_reduce($numbers, function ($previous, $current) {
return $previous + $current;
});
echo $total; // 60
With assoc array:
$carts = [
['item' => 'A', 'qty' => 2, 'price' => 10],
['item' => 'B', 'qty' => 3, 'price' => 20],
['item' => 'C', 'qty' => 5, 'price' => 30]
];
$total = array_reduce(
$carts,
function ($prev, $item) {
return $prev + $item['qty'] * $item['price'];
}
);
echo $total; // 155
More info => https://www.phptutorial.net/php-tutorial/php-array_reduce/
For those who landed here and are searching for a solution that merges N arrays AND also sums the values of identical keys found in the N arrays, I've written this function that works recursively as well. (See: https://gist.github.com/Nickology/f700e319cbafab5eaedc)
Example:
$a = array( "A" => "bob", "sum" => 10, "C" => array("x","y","z" => 50) );
$b = array( "A" => "max", "sum" => 12, "C" => array("x","y","z" => 45) );
$c = array( "A" => "tom", "sum" => 8, "C" => array("x","y","z" => 50, "w" => 1) );
print_r(array_merge_recursive_numeric($a,$b,$c));
Will result in:
Array
(
[A] => tom
[sum] => 30
[C] => Array
(
[0] => x
[1] => y
[z] => 145
[w] => 1
)
)
Here's the code:
<?php
/**
* array_merge_recursive_numeric function. Merges N arrays into one array AND sums the values of identical keys.
* WARNING: If keys have values of different types, the latter values replace the previous ones.
*
* Source: https://gist.github.com/Nickology/f700e319cbafab5eaedc
* #params N arrays (all parameters must be arrays)
* #author Nick Jouannem <nick#nickology.com>
* #access public
* #return void
*/
function array_merge_recursive_numeric() {
// Gather all arrays
$arrays = func_get_args();
// If there's only one array, it's already merged
if (count($arrays)==1) {
return $arrays[0];
}
// Remove any items in $arrays that are NOT arrays
foreach($arrays as $key => $array) {
if (!is_array($array)) {
unset($arrays[$key]);
}
}
// We start by setting the first array as our final array.
// We will merge all other arrays with this one.
$final = array_shift($arrays);
foreach($arrays as $b) {
foreach($final as $key => $value) {
// If $key does not exist in $b, then it is unique and can be safely merged
if (!isset($b[$key])) {
$final[$key] = $value;
} else {
// If $key is present in $b, then we need to merge and sum numeric values in both
if ( is_numeric($value) && is_numeric($b[$key]) ) {
// If both values for these keys are numeric, we sum them
$final[$key] = $value + $b[$key];
} else if (is_array($value) && is_array($b[$key])) {
// If both values are arrays, we recursively call ourself
$final[$key] = array_merge_recursive_numeric($value, $b[$key]);
} else {
// If both keys exist but differ in type, then we cannot merge them.
// In this scenario, we will $b's value for $key is used
$final[$key] = $b[$key];
}
}
}
// Finally, we need to merge any keys that exist only in $b
foreach($b as $key => $value) {
if (!isset($final[$key])) {
$final[$key] = $value;
}
}
}
return $final;
}
?>
Here you have how I usually do this kind of operations.
// We declare an empty array in wich we will store the results
$sumArray = array();
// We loop through all the key-value pairs in $myArray
foreach ($myArray as $k=>$subArray) {
// Each value is an array, we loop through it
foreach ($subArray as $id=>$value) {
// If $sumArray has not $id as key we initialize it to zero
if(!isset($sumArray[$id])){
$sumArray[$id] = 0;
}
// If the array already has a key named $id, we increment its value
$sumArray[$id]+=$value;
}
}
print_r($sumArray);
You can try this:
$c = array_map(function () {
return array_sum(func_get_args());
},$a, $b);
and finally:
print_r($c);
this works great on my laravel project
print_r($Array); // your original array
$_SUM = [];
// count($Array[0]) => if the number of keys are equall in all arrays then do a count of index 0 etc.
for ($i=0; $i < count($Array[0]); $i++) {
$_SUM[] = $Array[0][$i] + $Array[1][$i]; // do a for loop on the count
}
print_r($_SUM); // get a sumed up array
$sumArray = array();
foreach ($myArray as $k => $subArray) {
foreach ($subArray as $id => $value) {
if (!isset($sumArray[$id])) {
$sumArray[$id] = 0;
}
$sumArray[$id]+=$value;
}
}
$sumArray = array();
foreach ($myArray as $k=>$subArray) {
foreach ($subArray as $id=>$value) {
if(!isset($sumArray[$id])){
$sumArray[$id] =$value;
}else {
$sumArray[$id]+=$value;
}
}
}
print_r($sumArray);
`
For example, you can pluck all fields from a result like this below.
I am picking out the 'balance' from an array and save to a variable
$kii = $user->pluck('balance');
then on the next line u can sum like this:
$sum = $kii->sum();
Hope it helps.
Code here:
$temp_arr = [];
foreach ($a as $k => $v) {
if(!is_null($v)) {
$sum = isset($temp_arr[$v[0]]) ? ((int)$v[5] + $sum) : (int)$v[5];
$temp_arr[$v[0]] = $sum;
}
}
return $temp_arr;
Result:
{SEQ_OK: 1328,SEQ_ERROR: 561}