I need to sum the price values of all rows where the optional check element exists.
Sample data:
[
6254 => [
'check' => 'on',
'quantity' => 2,
'name' => 'Testing product_special One Size',
'total' => 15.9,
'price' => 33.0000,
'totalken' => 33075.9,
],
6255 => [
'quantity' => 1,
'name' => 'Testing card',
'total' => 113.85,
'price' => 33.0000,
'totalken' => 16537.95,
],
6256 => [
'check' => 'on',
'quantity' => 1,
'name' => 'Testing food',
'total' => 113.85,
'price' => 33.0000,
'totalken' => 16537.95,
],
]
I tried array_sum(array_column($value, 'price')) but this sums all price values regardless of the check value.
Expected result: 66
I would use array_reduce in this case.
array_reduce loops through the array and uses a callback function to reduce array to a single value.
<?php
$totalPrice = array_reduce($myArray, function ($accumulator, $item) {
// I'm checking 'check' key only here, you can test for 'on' value if needed
if (isset($item['check'])) {
$accumulator += $item['price'];
}
return $accumulator;
});
You can simply filter the array based on condition by using array_filter() function of php.
You can see the usage of array_filter() here.
Here is my solution for you if you want to use condition.
$filteredByCheck = array_filter($value, function ($val){
return isset($val['check']);
});
$total = array_sum(array_column($filteredByCheck, 'price'));
The quickest method would be just to loop over the array and maintain a sum, use ?? '' to default it to blank if not set...
$total = 0;
foreach ($value as $element ) {
if ( ($element['check'] ?? '') == "on" ) {
$total += $element['price'];
}
}
#aliirfaan's implementation of array_reduce() can be modernized and compacted as the following snippet.
Code: (Demo)
echo array_reduce(
$array,
fn($result, $row) =>
$result + isset($row['check']) * $row['price']
);
The above uses arrow function syntax which is available since PHP7.4. The mathematics in the return value of the custom function multiplies the price value by the true/false evaluation of isset() on the check column. The boolean value is coerced to an integer automatically when used with arithmetic -- false is zero and true is one. If the coercion is not to your liking, you can explicitly cast the boolean value using (int) immediately before isset().
I need help once again. I have an array and I need to extract earliest day weight value.
EDIT - EDIT - EDIT
array (
3 =>
array (
'id' => '20110211',
'Date' => '2011-02-11',
'Weight' => '195',
),
4 =>
array (
'id' => '20110213',
'Date' => '2011-02-13',
'Weight' => '160',
),
6 =>
array (
'id' => '20110310',
'Date' => '2011-03-10',
'Weight' => '200',
),
12 =>
array (
'id' => '20110301',
'Date' => '2011-03-01',
'Weight' => '55',
),
21 =>
array (
'id' => '20110215',
'Date' => '2011-02-15',
'Weight' => '120',
),
25 =>
array (
'id' => '20110322',
'Date' => '2011-03-22',
'Weight' => '250',
),
)
I've edited this and this code works:
function sortByDate ($arr1, $arr2)
{
return strcmp($arr1['Date'], $arr2['Date']);
}
// $arr is your array
usort($weight_tracker, 'sortByDate');
$earliest = $weight_tracker[0]['Weight'];
echo $earliest;
But since I have a form on this page which updates the array when array is updated - I got message Fatal error: Cannot use string offset as an array in
EDIT -> I've re-declared this as string, hence the ERROR ! be careful when using global and includes as everything can become a mess ! PHP is forgiving, but that "forgiveness" can cost a lot of time later on... :)
Thanks,
Peter
You could sort the array with a custom callback using usort() and then take the first element.
// $arr is your array
usort($arr, 'sortByDate');
$earliest = $arr[0];
function sortByDate ($arr1, $arr2)
{
return strcmp($arr1['Date'], $arr2['Date']);
}
This is one way of doing it:
function filter_min($a, $b) {
return ($a['Date'] < $b['date']) ? $a : $b;
}
$result = array_reduce($array, 'filter_min');
echo $result['Weight'];
Another way is to simply iterate over the array and find the smallest date.
$smallest = null; // array index of entry with smallest weight.
foreach ($array as $idx => $data) {
if (($data['Weight'] < $array[$smallest]['Weight']) || (is_null($smallest))) {
$smallest = $idx; // found a small weight, so save the index
}
}
echo $array[$smallest]['Date'];
I noticed that the dates are in reverse order with the latest date being pulled in first, and the earliest date last. Will it always be like that? If so, you can do this:
$index = count($array) - 1;
$earliestdate = $array[$index]['Date'];
You could also use array_reverse() to invert the array and make the first element the formerly last element.
If this is being pulled in from MySQL you could also alter the query to ORDER BY 'Date' DESC (or is it ASC that would get you what you want, can't remember)
This question already has answers here:
How can I sort arrays and data in PHP?
(14 answers)
Closed 8 years ago.
I have CSV data loaded into a multidimensional array. In this way each "row" is a record and each "column" contains the same type of data. I am using the function below to load my CSV file.
function f_parse_csv($file, $longest, $delimiter)
{
$mdarray = array();
$file = fopen($file, "r");
while ($line = fgetcsv($file, $longest, $delimiter))
{
array_push($mdarray, $line);
}
fclose($file);
return $mdarray;
}
I need to be able to specify a column to sort so that it rearranges the rows. One of the columns contains date information in the format of Y-m-d H:i:s and I would like to be able to sort with the most recent date being the first row.
Introducing: a very generalized solution for PHP 5.3+
I 'd like to add my own solution here, since it offers features that other answers do not.
Specifically, advantages of this solution include:
It's reusable: you specify the sort column as a variable instead of hardcoding it.
It's flexible: you can specify multiple sort columns (as many as you want) -- additional columns are used as tiebreakers between items that initially compare equal.
It's reversible: you can specify that the sort should be reversed -- individually for each column.
It's extensible: if the data set contains columns that cannot be compared in a "dumb" manner (e.g. date strings) you can also specify how to convert these items to a value that can be directly compared (e.g. a DateTime instance).
It's associative if you want: this code takes care of sorting items, but you select the actual sort function (usort or uasort).
Finally, it does not use array_multisort: while array_multisort is convenient, it depends on creating a projection of all your input data before sorting. This consumes time and memory and may be simply prohibitive if your data set is large.
The code
function make_comparer() {
// Normalize criteria up front so that the comparer finds everything tidy
$criteria = func_get_args();
foreach ($criteria as $index => $criterion) {
$criteria[$index] = is_array($criterion)
? array_pad($criterion, 3, null)
: array($criterion, SORT_ASC, null);
}
return function($first, $second) use (&$criteria) {
foreach ($criteria as $criterion) {
// How will we compare this round?
list($column, $sortOrder, $projection) = $criterion;
$sortOrder = $sortOrder === SORT_DESC ? -1 : 1;
// If a projection was defined project the values now
if ($projection) {
$lhs = call_user_func($projection, $first[$column]);
$rhs = call_user_func($projection, $second[$column]);
}
else {
$lhs = $first[$column];
$rhs = $second[$column];
}
// Do the actual comparison; do not return if equal
if ($lhs < $rhs) {
return -1 * $sortOrder;
}
else if ($lhs > $rhs) {
return 1 * $sortOrder;
}
}
return 0; // tiebreakers exhausted, so $first == $second
};
}
How to use
Throughout this section I will provide links that sort this sample data set:
$data = array(
array('zz', 'name' => 'Jack', 'number' => 22, 'birthday' => '12/03/1980'),
array('xx', 'name' => 'Adam', 'number' => 16, 'birthday' => '01/12/1979'),
array('aa', 'name' => 'Paul', 'number' => 16, 'birthday' => '03/11/1987'),
array('cc', 'name' => 'Helen', 'number' => 44, 'birthday' => '24/06/1967'),
);
The basics
The function make_comparer accepts a variable number of arguments that define the desired sort and returns a function that you are supposed to use as the argument to usort or uasort.
The simplest use case is to pass in the key that you 'd like to use to compare data items. For example, to sort $data by the name item you would do
usort($data, make_comparer('name'));
See it in action.
The key can also be a number if the items are numerically indexed arrays. For the example in the question, this would be
usort($data, make_comparer(0)); // 0 = first numerically indexed column
See it in action.
Multiple sort columns
You can specify multiple sort columns by passing additional parameters to make_comparer. For example, to sort by "number" and then by the zero-indexed column:
usort($data, make_comparer('number', 0));
See it in action.
Advanced features
More advanced features are available if you specify a sort column as an array instead of a simple string. This array should be numerically indexed, and must contain these items:
0 => the column name to sort on (mandatory)
1 => either SORT_ASC or SORT_DESC (optional)
2 => a projection function (optional)
Let's see how we can use these features.
Reverse sort
To sort by name descending:
usort($data, make_comparer(['name', SORT_DESC]));
See it in action.
To sort by number descending and then by name descending:
usort($data, make_comparer(['number', SORT_DESC], ['name', SORT_DESC]));
See it in action.
Custom projections
In some scenarios you may need to sort by a column whose values do not lend well to sorting. The "birthday" column in the sample data set fits this description: it does not make sense to compare birthdays as strings (because e.g. "01/01/1980" comes before "10/10/1970"). In this case we want to specify how to project the actual data to a form that can be compared directly with the desired semantics.
Projections can be specified as any type of callable: as strings, arrays, or anonymous functions. A projection is assumed to accept one argument and return its projected form.
It should be noted that while projections are similar to the custom comparison functions used with usort and family, they are simpler (you only need to convert one value to another) and take advantage of all the functionality already baked into make_comparer.
Let's sort the example data set without a projection and see what happens:
usort($data, make_comparer('birthday'));
See it in action.
That was not the desired outcome. But we can use date_create as a projection:
usort($data, make_comparer(['birthday', SORT_ASC, 'date_create']));
See it in action.
This is the correct order that we wanted.
There are many more things that projections can achieve. For example, a quick way to get a case-insensitive sort is to use strtolower as a projection.
That said, I should also mention that it's better to not use projections if your data set is large: in that case it would be much faster to project all your data manually up front and then sort without using a projection, although doing so will trade increased memory usage for faster sort speed.
Finally, here is an example that uses all the features: it first sorts by number descending, then by birthday ascending:
usort($data, make_comparer(
['number', SORT_DESC],
['birthday', SORT_ASC, 'date_create']
));
See it in action.
You can use array_multisort()
Try something like this:
foreach ($mdarray as $key => $row) {
// replace 0 with the field's index/key
$dates[$key] = $row[0];
}
array_multisort($dates, SORT_DESC, $mdarray);
For PHP >= 5.5.0 just extract the column to sort by. No need for the loop:
array_multisort(array_column($mdarray, 0), SORT_DESC, $mdarray);
With usort. Here's a generic solution, that you can use for different columns:
class TableSorter {
protected $column;
function __construct($column) {
$this->column = $column;
}
function sort($table) {
usort($table, array($this, 'compare'));
return $table;
}
function compare($a, $b) {
if ($a[$this->column] == $b[$this->column]) {
return 0;
}
return ($a[$this->column] < $b[$this->column]) ? -1 : 1;
}
}
To sort by first column:
$sorter = new TableSorter(0); // sort by first column
$mdarray = $sorter->sort($mdarray);
Multiple row sorting using a closure
Here's another approach using uasort() and an anonymous callback function (closure). I've used that function regularly. PHP 5.3 required – no more dependencies!
/**
* Sorting array of associative arrays - multiple row sorting using a closure.
* See also: http://the-art-of-web.com/php/sortarray/
*
* #param array $data input-array
* #param string|array $fields array-keys
* #license Public Domain
* #return array
*/
function sortArray( $data, $field ) {
$field = (array) $field;
uasort( $data, function($a, $b) use($field) {
$retval = 0;
foreach( $field as $fieldname ) {
if( $retval == 0 ) $retval = strnatcmp( $a[$fieldname], $b[$fieldname] );
}
return $retval;
} );
return $data;
}
/* example */
$data = array(
array( "firstname" => "Mary", "lastname" => "Johnson", "age" => 25 ),
array( "firstname" => "Amanda", "lastname" => "Miller", "age" => 18 ),
array( "firstname" => "James", "lastname" => "Brown", "age" => 31 ),
array( "firstname" => "Patricia", "lastname" => "Williams", "age" => 7 ),
array( "firstname" => "Michael", "lastname" => "Davis", "age" => 43 ),
array( "firstname" => "Sarah", "lastname" => "Miller", "age" => 24 ),
array( "firstname" => "Patrick", "lastname" => "Miller", "age" => 27 )
);
$data = sortArray( $data, 'age' );
$data = sortArray( $data, array( 'lastname', 'firstname' ) );
I know it's 2 years since this question was asked and answered, but here's another function that sorts a two-dimensional array. It accepts a variable number of arguments, allowing you to pass in more than one key (ie column name) to sort by. PHP 5.3 required.
function sort_multi_array ($array, $key)
{
$keys = array();
for ($i=1;$i<func_num_args();$i++) {
$keys[$i-1] = func_get_arg($i);
}
// create a custom search function to pass to usort
$func = function ($a, $b) use ($keys) {
for ($i=0;$i<count($keys);$i++) {
if ($a[$keys[$i]] != $b[$keys[$i]]) {
return ($a[$keys[$i]] < $b[$keys[$i]]) ? -1 : 1;
}
}
return 0;
};
usort($array, $func);
return $array;
}
Try it here: http://www.exorithm.com/algorithm/view/sort_multi_array
You can sort an array using usort function.
$array = array(
array('price'=>'1000.50','product'=>'product 1'),
array('price'=>'8800.50','product'=>'product 2'),
array('price'=>'200.0','product'=>'product 3')
);
function cmp($a, $b) {
return $a['price'] > $b['price'];
}
usort($array, "cmp");
print_r($array);
Output :
Array
(
[0] => Array
(
[price] => 134.50
[product] => product 1
)
[1] => Array
(
[price] => 2033.0
[product] => product 3
)
[2] => Array
(
[price] => 8340.50
[product] => product 2
)
)
Example
Here is a php4/php5 class that will sort one or more fields:
// a sorter class
// php4 and php5 compatible
class Sorter {
var $sort_fields;
var $backwards = false;
var $numeric = false;
function sort() {
$args = func_get_args();
$array = $args[0];
if (!$array) return array();
$this->sort_fields = array_slice($args, 1);
if (!$this->sort_fields) return $array();
if ($this->numeric) {
usort($array, array($this, 'numericCompare'));
} else {
usort($array, array($this, 'stringCompare'));
}
return $array;
}
function numericCompare($a, $b) {
foreach($this->sort_fields as $sort_field) {
if ($a[$sort_field] == $b[$sort_field]) {
continue;
}
return ($a[$sort_field] < $b[$sort_field]) ? ($this->backwards ? 1 : -1) : ($this->backwards ? -1 : 1);
}
return 0;
}
function stringCompare($a, $b) {
foreach($this->sort_fields as $sort_field) {
$cmp_result = strcasecmp($a[$sort_field], $b[$sort_field]);
if ($cmp_result == 0) continue;
return ($this->backwards ? -$cmp_result : $cmp_result);
}
return 0;
}
}
/////////////////////
// usage examples
// some starting data
$start_data = array(
array('first_name' => 'John', 'last_name' => 'Smith', 'age' => 10),
array('first_name' => 'Joe', 'last_name' => 'Smith', 'age' => 11),
array('first_name' => 'Jake', 'last_name' => 'Xample', 'age' => 9),
);
// sort by last_name, then first_name
$sorter = new Sorter();
print_r($sorter->sort($start_data, 'last_name', 'first_name'));
// sort by first_name, then last_name
$sorter = new Sorter();
print_r($sorter->sort($start_data, 'first_name', 'last_name'));
// sort by last_name, then first_name (backwards)
$sorter = new Sorter();
$sorter->backwards = true;
print_r($sorter->sort($start_data, 'last_name', 'first_name'));
// sort numerically by age
$sorter = new Sorter();
$sorter->numeric = true;
print_r($sorter->sort($start_data, 'age'));
Before I could get the TableSorter class to run I had came up with a function based on what Shinhan had provided.
function sort2d_bycolumn($array, $column, $method, $has_header)
{
if ($has_header) $header = array_shift($array);
foreach ($array as $key => $row) {
$narray[$key] = $row[$column];
}
array_multisort($narray, $method, $array);
if ($has_header) array_unshift($array, $header);
return $array;
}
$array is the MD Array you want to sort.
$column is the column you wish to sort by.
$method is how you want the sort performed, such as SORT_DESC
$has_header is set to true if the first row contains header values that you don't want sorted.
The "Usort" function is your answer.
http://php.net/usort
I tried several popular array_multisort() and usort() answers and none of them worked for me. The data just gets jumbled and the code is unreadable. Here's a quick a dirty solution. WARNING: Only use this if you're sure a rogue delimiter won't come back to haunt you later!
Let's say each row in your multi array looks like: name, stuff1, stuff2:
// Sort by name, pull the other stuff along for the ride
foreach ($names_stuff as $name_stuff) {
// To sort by stuff1, that would be first in the contatenation
$sorted_names[] = $name_stuff[0] .','. name_stuff[1] .','. $name_stuff[2];
}
sort($sorted_names, SORT_STRING);
Need your stuff back in alphabetical order?
foreach ($sorted_names as $sorted_name) {
$name_stuff = explode(',',$sorted_name);
// use your $name_stuff[0]
// use your $name_stuff[1]
// ...
}
Yeah, it's dirty. But super easy, won't make your head explode.