I have a multidimensional array with a race type column and a boats column (which has the total number of boats for each race type). This is how I am getting the array values:
$boats = $wpdb->get_results("
select rt.race_type
,sum(tr.boat_count) boats
from registrations tr
group by rt.race_type;
");
The array works perfectly fine. But now I am trying to get the total number of boats for all race types (without using a loop). After some research, I have tried the code below, but it doesn't seem to be working:
$totalboats = array_sum(array_column($boats,'boats'));
When I run the following command:
echo $totalboats;
The result of that is 0, which is clearly wrong.
Any ideas? I am running PHP 5.6.29.
================== EDIT 01 ==================
As requested, here is the var_dump of $boats:
array(2) {
[0]=>
object(stdClass)#672 (2) {
["race_type"]=> string(12) "Elite 8-Hour"
["boats"]=> string(1) "2"
}
[1]=>
object(stdClass)#673 (2) {
["race_type"]=> string(12) "Sport 4-Hour"
["boats"]=> string(1) "2"
}
}
The problem is that your $boats sub-elements are objects and not arrays. array_column doesn't work with objects in PHP5 (it does in PHP7, though).
You could use a workaround using array_map, as shown in this answer to a previous question :
$totalboats = array_sum(
array_column(
array_map(
function($o){
return (array)$o;
},
$boats),
'boats')
);
echo $totalboats; // echoes "4"
If your variable is array and not object you can use this
$array = [
0 => [
'race_type' => 'Elite 8-Hour',
'boats' => '2',
],
1 => [
'race_type' => 'Sport 4-Hour',
'boats' => '2',
]
];
$toSum = array_sum(array_column($array, 'boats'));
echo "<pre>";print_r($toSum);die;
Related
I'm studying php and I'm trying to figure out how to get the string "Juve_Milan" from this var_dump($_POST) :
array(5) {
["Juve_Milan"] => array(2) {
[0] => string(1)
"5" [1] => string(1)
"1"
}["Inter_Roma"] => array(2) {
[0] => string(1)
"4" [1] => string(1)
"4"
}["Napoli_Lazio"] => array(2) {
[0] => string(1)
"2" [1] => string(1)
"5"
}["name"] => string(0)
"" ["submit"] => string(5)
"Invia"
}
I could get all of them with:
foreach ($_POST as $param_name => $param_val) {
echo "<tr><td>".$param_name."</td><td>".$param_val[0]."-".$param_val[1]."</td></tr>";
}
But i want to get them exactly one by one, for example, if i want to get the string "Juve_Milan" or "inter_Roma" how can i do?
Without looping, how can i get the string value: "Juve_milan" or "Inter_Roma"? Becouse with the loop i can access them this way : $_POST as $param_name => $param_val
But i want to get them without loop, my first attempt was something like $_POST[0][0] but its wrong...
There are numbers of php array functions you can use.
You can use
array shift
to remove an element from an array and display it .e.g
$club = ['juve_millan', 'inter_roma', 'napoli_lazio'];
$juve = array_shift($club);
echo $juve;// 'juve_millan'
but note that the array is shortened by one element i.e. 'juve_millan' is no more in the array and also note that using
array_shift
over larger array is fairly slow
Array Slice function
PHP
array_slice()
function is used to extract a slice of an array e.g
$club = ['juve_millan', 'inter_roma', 'napoli_lazio'];
if I want to display
inter_roma
or assigned it to a variable, then I can do this
$roma = array_slice($club, 1, 1);// The first parameter is the array to slice, the second parameter is where to begin(which is one since most programming language array index start from 0 meaning juve_millan is zero, while inter_roma is 1, napoli_lazio is 2) and the length is 1 since i want to return a single element.
I hope you understand
You could iterate over keys of the main array like this:
foreach($_POST as $param_name => $param_val) {
echo "<tr><td>".$param_name."</td></tr>";
}
This will return each Juve_Milan, Inter_Roma etc. one by one. Although it's part of the code you already have, I believe this will return values you want only.
I have a multidimensional array that I am trying to search for a specific value (url) and then retrieve an another value in the same row (value). I also need to divert to an else if it is not found.
array(2) {
[0]=> array(2) {
["url"]=> string(7) "fareham"
["value"]=> string(7) "Fareham"
}
[1]=> array(2) {
["url"]=> string(11) "southampton"
["value"]=> string(11) "Southampton"
}
}
I have been experimenting with array_key_exists() and isset() to check it's set and just coming up null!
For example, if I search for fareham, I want to return Fareham. If I search for nottingham, I expect null.
How can I isolate the qualifying value?
Use array_column() to index the data by the url columns and then use isset() to check if the value is there...
$data = array_column($data, "value", "url");
$search = 'southampton';
$value = isset($data[$search])?$data[$search]:"not found";
echo $value;
or for PHP 7+, you can use the null coalescing operator (??)
$value = $data[$search]??"not found";
Here is the minimal way to do it (no checks)
$a = array (
0 =>
array (
"url" => 'fareham',
"value" => 'Fareham'
),
1 =>
array (
"url" => 'southampton',
"value" => 'Southampton'
)
);
$u = 'fareham';
$i = $a[false===($f=array_search($u,array_column($a,'url')))?-1:$f]['value'];
print_r($i);
Output
Fareham
Sandbox
How it works
First we create an array we can search by using array_column on the column we want to search in this case url. It looks like this [0=>'fareham', 1=>'southampton']
Then we use the normal array_search which returns an index, if you notice above the indexes are correlated to the original array. Which means we can put that in as the top level key, then it's a simple matter of adding the key we want.
Because array_search can return a boolean(false) which PHP sees as 0 or the first index I put a little hack in for that. But a better way is to check it like this:
$a = array (
0 =>
array (
"url" => 'fareham',
"value" => 'Fareham',
"extra" => 'Foo'
),
1 =>
array (
"url" => 'southampton',
"value" => 'Southampton',
"extra" => 'Bar'
)
);
function serchMultiDimensionalValue($needle, $haystack, $fields='value'){
if(false === ($f=array_search($needle,array_column($haystack,'url')))) return false; //or return [];
if(!is_array($fields)) $fields = [$fields];
return array_intersect_key($haystack[$f], array_flip($fields));
}
var_dump(serchMultiDimensionalValue('foo',$a));
var_dump(serchMultiDimensionalValue('fareham',$a));
var_dump(serchMultiDimensionalValue('fareham',$a, 'extra'));
var_dump(serchMultiDimensionalValue('fareham',$a, ['extra','url']));
Ouput
bool(false)
array(1) {
["value"]=>
string(7) "Fareham"
}
array(1) {
["extra"]=>
string(3) "Foo"
}
array(2) {
["url"]=>
string(7) "fareham"
["extra"]=>
string(3) "Foo"
}
Sandbox
I added a bit more "functionality" to it, hope you don't mind.
While it might be alluring to seek out a one-liner like:
array_column($array, $returnColumn, $haystackColumn)[$needle] ?? null
Be aware that array_column() will be unconditionally doubling the memory usage (because it is generating a new array with the same length as the original) for the sake of assigning new first level keys to search by.
Metaphorically speaking, it is like building a new registry of residences in a neighborhood including every homeowner's name and their address. Yes, you can find out who lives at a given home without knocking on the front door, but you had to knock on every door to collect every home's details before enjoying this convenience. Why not just knock on the door of each original house and ask if they are who you are looking for? It is much easier, and you will be able to "quit" early as soon as you find the homeowner that you are looking for.
For best efficiency and for least memory usage, I recommend the below classic loop with conditional break. It is built with dynamic search and return variables for general usage, but you can use hardcoded values if you like.
Code: (Demo)
$array = [
["url" => 'fareham', "value" => 'Fareham'],
["url" => 'southampton', "value" => 'Southampton']
];
$needle = 'fareham';
$haystackColumn = 'url';
$returnColumn = 'value';
$value = null;
foreach ($array as $row) {
if ($row[$haystackColumn] === $needle) {
$value = $row[$returnColumn];
break;
}
}
var_export($value); // 'Fareham'
I have a some messy data coming in from a feed, and am trying to figure out how to sort it correctly. I posted a simplified example below. I'd like to sort the people array alphabetically by the Group name.
$people = array(
"category_id_1" => array (
"Mark",
"Jenny",
"Andrew"
),
"category_id_2" => array (
"John",
"Lewis",
"Andrea"
),
"category_id_3" => array (
"Hannah",
"Angie",
"Raleigh"
)
);
$categories = array(
"category_id_1" => "Group B",
"category_id_2" => "Group C",
"category_id_3" => "Group A"
);
Ideally, the end result would be
$people = array(
"category_id_3" => array ( // Group A
"Hannah",
"Angie",
"Raleigh"
),
"category_id_1" => array ( // Group B
"Mark",
"Jenny",
"Andrew"
),
"category_id_2" => array ( // Group C
"John",
"Lewis",
"Andrea"
)
);
I've been spinning my wheels for a while now, and the closest I have gotten is this uasort, which still isn't doing the trick.
uasort($people, function ($a, $b) {
return strcmp($categories[$a], $categories[$b]);
});
Thanks so much for any help.
This can be achieved in a simpler way by taking advantage of array_replace:
// Work on a copy just to be sure the rest of your code is not affected
$temp_categories = $categories;
// Sort categories by name
asort($temp_categories);
// Replace the values of the sorted array with the ones in $people
$ordered_people = array_replace($temp_categories, $people);
You want to sort $people by its keys not its values. You can use uksort for this. Additionally you need to make $categories available in your function. I prefer use for that; but you could also make it a global variable. Final code:
uksort($people, function ($a,$b) use ($categories) {
return strcmp($categories[$a], $categories[$b]);
});
Manual for uksort
use language construct. Before example 3.
I think what you need is to Asort categories and the use that sorted array in a foreach.
Asort($categories);
Foreach($categories as $key => $group){
$new[$key] =$people[$key];
}
Var_dump($new);
https://3v4l.org/kDAQW
Output:
array(3) {
["category_id_3"]=> array(3) {
[0]=> "Hannah"
[1]=> "Angie"
[2]=> "Raleigh"
}
["category_id_1"]=> array(3) {
[0]=> "Mark"
[1]=> "Jenny"
[2]=> "Andrew"
}
["category_id_2"]=>array(3) {
[0]=> "John"
[1]=> "Lewis"
[2]=> "Andrea"
}
}
Try this(tested and working):
asort($categories);
$sorted = array();
foreach ($categories as $key => $value)
$sorted[$key]=$people[$key];
A better shorter approach:(tested and working)
asort($categories);
$result = array_merge($categories,$people);
The second method takes advantage of the fact that array_merge function replace the values in the first array with those in the second one when keys are the same.
warning : The second approach will not work if the keys are numbers. Use only string keys with it. Furthermore if the categories array has entries without corresponding entries in the people array they will be copied to the result
To solve this problem we use array_replace :
asort($categories);
$result = array_replace($categories,$people);
Var_dump($result);// tested and working
This question already has answers here:
Transposing multidimensional arrays in PHP
(12 answers)
Closed 1 year ago.
I have the following associative array of column data:
$where = array(
'id'=>array(
12,
13,
14
),
'date'=>array(
'1999-06-12',
'2000-03-21',
'2006-09-31'
)
);
I need to transpose / rotate the structure to be an array of rows (with merged column data assigned to their respective row). I don't need the column names in the result.
Expected output:
$comb = array(
array(12, '1999-06-12'),
array(13, '2000-03-21'),
array(14, '2006-09-31')
);
As Kris Roofe stated in his deleted answer, array_column is indeed a more elegant way. Just be sure to put it into some kind of a foreach loop, similar to what Sahil Gulati showed you. For example, like this:
$result = array();
foreach($where['id'] as $k => $v)
{
$result[] = array_column($where, $k);
}
The var_dump output of $result is exactly what you're looking for
array(3) {
[0]=>
array(2) {
[0]=>
int(12)
[1]=>
string(10) "1999-06-12"
}
[1]=>
array(2) {
[0]=>
int(13)
[1]=>
string(10) "2000-03-21"
}
[2]=>
array(2) {
[0]=>
int(14)
[1]=>
string(10) "2006-09-31"
}
}
Solution 1: Hope this simple foreach to get the desired result
Try this code snippet here
<?php
ini_set('display_errors', 1);
$where = array('id'=>array(12,13,14),'date'=>array('1999-06-12','2000-03-21','2006-09-31'));
$result=array();
foreach($where["id"] as $key => $value)
{
$result[]=array($value,$where["date"][$key]);
}
Solution 2: Here we are using array_walk to achieve the same result
Try this code snippet here
<?php
ini_set('display_errors', 1);
$result=array();
$where = array('id'=>array(12,13,14),'date'=>array('1999-06-12','2000-03-21','2006-09-31'));
array_walk($where["id"], function($value,$key) use(&$result,&$where){
$result[]=array($value,$where["date"][$key]);
});
print_r($result);
Solution 3: Here we are using array_shift on $where["date"].
Try this code snippet here
<?php
ini_set('display_errors', 1);
$result=array();
$where = array('id'=>array(12,13,14),'date'=>array('1999-06-12','2000-03-21','2006-09-31'));
foreach($where["id"] as $value)
{
$result[]=array($value, array_shift($where["date"]));
}
print_r($result);
I've completely re-written my answer because it was unnecessarily bloating this page. Truth is, there is a very clean and native way to handle this specific task of "transposing". Using null as the function argument and passing in the two known rows from the input array is all that is required.
Code: (Demo)
$where = [
'id' => [12, 13, 14],
'date' => ['1999-06-12', '2000-03-21', '2006-09-31']
];
var_export(
array_map(null, $where['id'], $where['date'])
);
Output:
array (
0 =>
array (
0 => 12,
1 => '1999-06-12',
),
1 =>
array (
0 => 13,
1 => '2000-03-21',
),
2 =>
array (
0 => 14,
1 => '2006-09-31',
),
)
For anyone that truly needs a dynamic solution (because the number of rows may fluxuate/change and you don't want to keep maintaining the processing code), then I recommend that you check the version history of my answer.
I have an PHP array that looks something like this:
Index Key Value
[0] 1 Awaiting for Confirmation
[1] 2 Assigned
[2] 3 In Progress
[3] 4 Completed
[4] 5 Mark As Spam
When I var_dump the array values i get this:
array(5) { [0]=> array(2) { ["key"]=> string(1) "1" ["value"]=> string(25) "Awaiting for Confirmation" } [1]=> array(2) { ["key"]=> string(1) "2" ["value"]=> string(9) "Assigned" } [2]=> array(2) { ["key"]=> string(1) "3" ["value"]=> string(11) "In Progress" } [3]=> array(2) { ["key"]=> string(1) "4" ["value"]=> string(9) "Completed" } [4]=> array(2) { ["key"]=> string(1) "5" ["value"]=> string(12) "Mark As Spam" } }
I wanted to remove Completed and Mark As Spam. I know I can unset[$array[3],$array[4]), but the problem is that sometimes the index number can be different.
Is there a way to remove them by matching the value name instead of the key value?
Your array is quite strange : why not just use the key as index, and the value as... the value ?
Wouldn't it be a lot easier if your array was declared like this :
$array = array(
1 => 'Awaiting for Confirmation',
2 => 'Asssigned',
3 => 'In Progress',
4 => 'Completed',
5 => 'Mark As Spam',
);
That would allow you to use your values of key as indexes to access the array...
And you'd be able to use functions to search on the values, such as array_search() :
$indexCompleted = array_search('Completed', $array);
unset($array[$indexCompleted]);
$indexSpam = array_search('Mark As Spam', $array);
unset($array[$indexSpam]);
var_dump($array);
Easier than with your array, no ?
Instead, with your array that looks like this :
$array = array(
array('key' => 1, 'value' => 'Awaiting for Confirmation'),
array('key' => 2, 'value' => 'Asssigned'),
array('key' => 3, 'value' => 'In Progress'),
array('key' => 4, 'value' => 'Completed'),
array('key' => 5, 'value' => 'Mark As Spam'),
);
You'll have to loop over all items, to analyse the value, and unset the right items :
foreach ($array as $index => $data) {
if ($data['value'] == 'Completed' || $data['value'] == 'Mark As Spam') {
unset($array[$index]);
}
}
var_dump($array);
Even if do-able, it's not that simple... and I insist : can you not change the format of your array, to work with a simpler key/value system ?
...
$array = array(
1 => 'Awaiting for Confirmation',
2 => 'Asssigned',
3 => 'In Progress',
4 => 'Completed',
5 => 'Mark As Spam',
);
return array_values($array);
...
$key = array_search("Mark As Spam", $array);
unset($array[$key]);
For 2D arrays...
$remove = array("Mark As Spam", "Completed");
foreach($arrays as $array){
foreach($array as $key => $value){
if(in_array($value, $remove)) unset($array[$key]);
}
}
You can use this
unset($dataArray['key']);
Why do not use array_diff?
$array = array(
1 => 'Awaiting for Confirmation',
2 => 'Asssigned',
3 => 'In Progress',
4 => 'Completed',
5 => 'Mark As Spam',
);
$to_delete = array('Completed', 'Mark As Spam');
$array = array_diff($array, $to_delete);
Just note that your array would be reindexed.
Try this:
$keys = array_keys($array, "Completed");
/edit
As mentioned by JohnP, this method only works for non-nested arrays.
I kinda disagree with the accepted answer. Sometimes an application architecture doesn't want you to mess with the array id, or makes it inconvenient. For instance, I use CakePHP quite a lot, and a database query returns the primary key as a value in each record, very similar to the above.
Assuming the array is not stupidly large, I would use array_filter. This will create a copy of the array, minus the records you want to remove, which you can assign back to the original array variable.
Although this may seem inefficient it's actually very much in vogue these days to have variables be immutable, and the fact that most php array functions return a new array rather than futzing with the original implies that PHP kinda wants you to do this too. And the more you work with arrays, and realize how difficult and annoying the unset() function is, this approach makes a lot of sense.
Anyway:
$my_array = array_filter($my_array,
function($el) {
return $el["value"]!="Completed" && $el!["value"]!="Marked as Spam";
});
You can use whatever inclusion logic (eg. your id field) in the embedded function that you want.
The way to do this to take your nested target array and copy it in single step to a non-nested array.
Delete the key(s) and then assign the final trimmed array to the nested node of the earlier array.
Here is a code to make it simple:
$temp_array = $list['resultset'][0];
unset($temp_array['badkey1']);
unset($temp_array['badkey2']);
$list['resultset'][0] = $temp_array;
for single array Item use reset($item)