I have the following array:
array('data' => array('one' => 'first', 'two' => 'second'));
How i can get the value of key 'one' using string:
echo __('data.one');
function __($key) {
$parts = explode('.', $key);
$array = array('data' => array('one' => 'first', 'two' => 'second'));
return ???;
}
Thank u!
Add your own error handling in case the key path isn't in your array, but something like:
$array = array('data' => array('one' => 'first', 'two' => 'second'));
$key = 'data.one';
function find($key, $array) {
$parts = explode('.', $key);
foreach ($parts as $part) {
$array = $array[$part];
}
return $array;
}
$result = find($key, $array);
var_dump($result);
This should work for you:
return $array["data"]["one"];
Also for more information and to learn a little bit see: http://php.net/manual/en/language.types.array.php
And : PHP - Accessing Multidimensional Array Values
EDIT:
This should work for you:
<?php
$str = "data.one";
$keys = explode(".", $str);
$array = array('data' => array('one' => 'first', 'two' => 'second'));
$access = $array;
foreach($keys as $v)
$access = $access[$v];
echo $access;
?>
I have two arrays:
$arr1 = array("123" => "abc");
$arr2 = array("123" => "xyz", "456" => "lmn");
I want the resultant array to be:
$arr = array("123" => "abc,xyz", "456" => "lmn");
I know I can write some code to fetch the values corresponding to keys and then concat with a separator like ';' or ',', but I want to know is there any efficient way to do this?
An in-built function maybe?
Simple foreach will do! Check inline comments
$arr1 = ["123" => "abc"];
$arr2 = ["123" => "xyz", "456" => "lmn"];
foreach ($arr2 as $key => $value) {
if(array_key_exists($key, $arr1)) // Check if key exists in array
$arr1[$key] .= ",$value"; // If so, append
else
$arr1[$key] = $value; // otherwise, add
}
print_r($arr1);
Prints
Array
(
[123] => abc,xyz
[456] => lmn
)
Check this Eval
try this:
$arr1 = array("123" => "abc");
$arr2 = array("123" => "xyz", "456" => "lmn");
$o = [];
foreach($arr1 as $k => $v)
{
$o[$k][] = $v;
}
foreach($arr2 as $k => $v)
{
$o[$k][] = $v;
}
$result = array_map(function($v){implode(',', array_unique($v));}, $o);
Array1
(
[a]=>1; [b]=>2; [c]=>3
)
Array2
(
[a]=>1;[b] =>1
)
Required result:
Array1
(
[a]=>2; [b]=>3; [c]=>3
)
How do i append Array1 with the values of Array2 based on their key? Thanks.
You can try something like this:
foreach($array2 as $key2 => $val2){
if(key_exists($key2, $array1)) {
$array1[$key2] += $val2;
} else {
$array1[$key2] = $val2;
}
}
Part of the issue would be that array 1 may not have all of the same keys as array 2. So, an array of all keys from both original arrays is needed, then loop through those keys, check if it exists in either original array, and finally add it to the final combined array.
<?php
$array1 = array('a' => 1, 'b' => 2, 'c' => 3);
$array2 = array('a' => 1, 'b' => 2, 'd' => 3);
$finalarr = array();
$arrkeys = array_merge(array_keys($array1), array_keys($array2));
$arrkeys = array_unique($arrkeys);
foreach($arrkeys as $key) {
$finalarr[$key] = 0;
if (isset($array1[$key])) {
$finalarr[$key] += $array1[$key];
}
if (isset($array2[$key])) {
$finalarr[$key] += $array2[$key];
}
}
print_r($finalarr);
?>
foreach($array1 as $key=>$value){
if(isset($array2[$key])){
$array1[$key] = $array1[$key] + $array2[$key];
}
}
Not the most elegant way, which would use array_walk or array_map, but I like to see and know exactly what's going on. This will give you what you are looking for.
First sum the values of the common keys and after that, add the others key in the other array:
foreach ($array2 as $k2 => $a2){
if (isset($array1[$k2])){
$array1[$k2]+=$a2;
unset($array2[$k2]);
}
}
$array1 += $array2;
Something like:
$result = array();
function ParseArray(array $array, array &$result)
{
foreach ($array as $k => $v) {
if (!array_key_exists($k, $result) {
$result[$k] = $v;
} else {
$result[$k] += $v;
}
}
}
ParseArray($Array1, $result);
ParseArray($Array2, $result);
print_r($result);
You should read about PHP array functions.
$array1 = array(
'a' => 1,
'b' => 2,
'c' => 3,
);
$array2 = array(
'a' => 1,
'b' => 1,
);
array_walk(
$array1,
function (&$value, $key) use ($array2) {
$value += (isset($array2[$key])) ? $array2[$key] : 0;
}
);
var_dump($array1);
I have an array that may look like
$arr = array(
array(
'test1' => 'testing1'
),
array(
'test2' => array(
1 =>'testing2
)
);
and I want to turn it into
$newArr = array(
'test1' => 'testing1',
'test2' => array(
1 => 'testing2'
)
);
so i have been trying to shift all array elements up one level.
eidt:
this is my method that combines 2 array together:
public function arrayMerge($arr1, $arr2)
{
foreach($arr2 as $key => $value) {
$condition = (array_key_exists($key, $arr1) && is_array($value));
$arr1[$key] = ($condition ? $this->arrayMerge($arr1[$key], $arr2[$key]) : $value);
}
return $arr1;
}
It's somewhat trivial, many ways are possible.
For example using the array union operator (+)Docs creating the union of all arrays inside the array:
$newArr = array();
foreach ($arr as $subarray)
$newArr += $subarray;
Or by using array_mergeDocs with all subarrays at once via call_user_func_arrayDocs:
$newArray = call_user_func_array('array_merge', $arr);
Try
$arr = array(
array('test1' => 'testing1' ),
array('test2' => array(1 =>'testing2'))
);
$new = array();
foreach($arr as $value) {
$new += $value;
}
var_dump($new);
Output
array
'test1' => string 'testing1' (length=8)
'test2' =>
array
1 => string 'testing2' (length=8)
How would you flip 90 degrees (transpose) a multidimensional array in PHP? For example:
// Start with this array
$foo = array(
'a' => array(
1 => 'a1',
2 => 'a2',
3 => 'a3'
),
'b' => array(
1 => 'b1',
2 => 'b2',
3 => 'b3'
),
'c' => array(
1 => 'c1',
2 => 'c2',
3 => 'c3'
)
);
$bar = flipDiagonally($foo); // Mystery function
var_dump($bar[2]);
// Desired output:
array(3) {
["a"]=>
string(2) "a2"
["b"]=>
string(2) "b2"
["c"]=>
string(2) "c2"
}
How would you implement flipDiagonally()?
Edit: this is not homework. I just want to see if any SOers have a more creative solution than the most obvious route. But since a few people have complained about this problem being too easy, what about a more general solution that works with an nth dimension array?
i.e. How would you write a function so that:
$foo[j][k][...][x][y][z] = $bar[z][k][...][x][y][j]
?(ps. I don't think 12 nested for loops is the best solution in this case.)
function transpose($array) {
array_unshift($array, null);
return call_user_func_array('array_map', $array);
}
Or if you're using PHP 5.6 or later:
function transpose($array) {
return array_map(null, ...$array);
}
With 2 loops.
function flipDiagonally($arr) {
$out = array();
foreach ($arr as $key => $subarr) {
foreach ($subarr as $subkey => $subvalue) {
$out[$subkey][$key] = $subvalue;
}
}
return $out;
}
I think you're referring to the array transpose (columns become rows, rows become columns).
Here is a function that does it for you (source):
function array_transpose($array, $selectKey = false) {
if (!is_array($array)) return false;
$return = array();
foreach($array as $key => $value) {
if (!is_array($value)) return $array;
if ($selectKey) {
if (isset($value[$selectKey])) $return[] = $value[$selectKey];
} else {
foreach ($value as $key2 => $value2) {
$return[$key2][$key] = $value2;
}
}
}
return $return;
}
Transposing an N-dimensional array:
function transpose($array, &$out, $indices = array())
{
if (is_array($array))
{
foreach ($array as $key => $val)
{
//push onto the stack of indices
$temp = $indices;
$temp[] = $key;
transpose($val, $out, $temp);
}
}
else
{
//go through the stack in reverse - make the new array
$ref = &$out;
foreach (array_reverse($indices) as $idx)
$ref = &$ref[$idx];
$ref = $array;
}
}
$foo[1][2][3][3][3] = 'a';
$foo[4][5][6][5][5] = 'b';
$out = array();
transpose($foo, $out);
echo $out[3][3][3][2][1] . ' ' . $out[5][5][6][5][4];
Really hackish, and probably not the best solution, but hey it works.
Basically it traverses the array recursively, accumulating the current indicies in an array.
Once it gets to the referenced value, it takes the "stack" of indices and reverses it, putting it into the $out array. (Is there a way of avoiding use of the $temp array?)
Codler's answer fails for a single-row matrix (e.g. [[1,2]]) and also for the empty matrix ([]), which must be special-cased:
function transpose(array $matrix): array {
if (!$matrix) return [];
return array_map(count($matrix) == 1 ? fn ($x) => [$x] : null, ...$matrix);
}
(note: PHP 7.4+ syntax, easy enough to adapt for older versions)
I got confronted with the same problem. Here is what i came up with:
function array_transpose(array $arr)
{
$keys = array_keys($arr);
$sum = array_values(array_map('count', $arr));
$transposed = array();
for ($i = 0; $i < max($sum); $i ++)
{
$item = array();
foreach ($keys as $key)
{
$item[$key] = array_key_exists($i, $arr[$key]) ? $arr[$key][$i] : NULL;
}
$transposed[] = $item;
}
return $transposed;
}
I needed a transpose function with support for associative array:
$matrix = [
['one' => 1, 'two' => 2],
['one' => 11, 'two' => 22],
['one' => 111, 'two' => 222],
];
$result = \array_transpose($matrix);
$trans = [
'one' => [1, 11, 111],
'two' => [2, 22, 222],
];
And the way back:
$matrix = [
'one' => [1, 11, 111],
'two' => [2, 22, 222],
];
$result = \array_transpose($matrix);
$trans = [
['one' => 1, 'two' => 2],
['one' => 11, 'two' => 22],
['one' => 111, 'two' => 222],
];
The array_unshift trick did not work NOR the array_map...
So I've coded a array_map_join_array function to deal with record keys association:
/**
* Similar to array_map() but tries to join values on intern keys.
* #param callable $callback takes 2 args, the intern key and the list of associated values keyed by array (extern) keys.
* #param array $arrays the list of arrays to map keyed by extern keys NB like call_user_func_array()
* #return array
*/
function array_map_join_array(callable $callback, array $arrays)
{
$keys = [];
// try to list all intern keys
array_walk($arrays, function ($array) use (&$keys) {
$keys = array_merge($keys, array_keys($array));
});
$keys = array_unique($keys);
$res = [];
// for each intern key
foreach ($keys as $key) {
$items = [];
// walk through each array
array_walk($arrays, function ($array, $arrKey) use ($key, &$items) {
if (isset($array[$key])) {
// stack/transpose existing value for intern key with the array (extern) key
$items[$arrKey] = $array[$key];
} else {
// or stack a null value with the array (extern) key
$items[$arrKey] = null;
}
});
// call the callback with intern key and all the associated values keyed with array (extern) keys
$res[$key] = call_user_func($callback, $key, $items);
}
return $res;
}
and array_transpose became obvious:
function array_transpose(array $matrix)
{
return \array_map_join_array(function ($key, $items) {
return $items;
}, $matrix);
}
We can do this by using Two foreach. Traveling one array and another array to create new arrayLike This:
$foo = array(
'a' => array(
1 => 'a1',
2 => 'a2',
3 => 'a3'
),
'b' => array(
1 => 'b1',
2 => 'b2',
3 => 'b3'
),
'c' => array(
1 => 'c1',
2 => 'c2',
3 => 'c3'
)
);
$newFoo = [];
foreach($foo as $a => $k){
foreach($k as $i => $j){
$newFoo[$i][]= $j;
}
}
Check The Output
echo "<pre>";
print_r($newFoo);
echo "</pre>";
Before I start, I'd like to say thanks again to #quazardus for posting his generalised solution for tranposing any two dimenional associative (or non-associative) array!
As I am in the habit of writing my code as tersely as possible I went on to "minimizing" his code a little further. This will very likely not be to everybody's taste. But just in case anyone should be interested, here is my take on his solution:
function arrayMap($cb, array $arrays) // $cb: optional callback function
{ $keys = [];
array_walk($arrays, function ($array) use (&$keys)
{ $keys = array_merge($keys, array_keys($array)); });
$keys = array_unique($keys); $res = [];
foreach ($keys as $key) {
$items = array_map(function ($arr) use ($key)
{return isset($arr[$key]) ? $arr[$key] : null; },$arrays);
$res[$key] = call_user_func(
is_callable($cb) ? $cb
: function($k, $itms){return $itms;},
$key, $items);
}
return $res;
}
Now, analogous to the PHP standard function array_map(), when you call
arrayMap(null,$b);
you will get the desired transposed matrix.
This is another way to do the exact same thing which #codler s answer does. I had to dump some arrays in csv so I used the following function:
function transposeCsvData($data)
{
$ct=0;
foreach($data as $key => $val)
{
//echo count($val);
if($ct< count($val))
$ct=count($val);
}
//echo $ct;
$blank=array_fill(0,$ct,array_fill(0,count($data),null));
//print_r($blank);
$retData = array();
foreach ($data as $row => $columns)
{
foreach ($columns as $row2 => $column2)
{
$retData[$row2][$row] = $column2;
}
}
$final=array();
foreach($retData as $k=>$aval)
{
$final[]=array_replace($blank[$k], $aval);
}
return $final;
}
Test and output reference: https://tutes.in/how-to-transpose-an-array-in-php-with-irregular-subarray-size/
Here is array_walk way to achieve this,
function flipDiagonally($foo){
$temp = [];
array_walk($foo, function($item,$key) use(&$temp){
foreach($item as $k => $v){
$temp[$k][$key] = $v;
}
});
return $temp;
}
$bar = flipDiagonally($foo); // Mystery function
Demo.
Here's a variation of Codler/Andreas's solution that works with associative arrays. Somewhat longer but loop-less purely functional:
<?php
function transpose($array) {
$keys = array_keys($array);
return array_map(function($array) use ($keys) {
return array_combine($keys, $array);
}, array_map(null, ...array_values($array)));
}
Example:
<?php
$foo = array(
"fooA" => [ "a1", "a2", "a3"],
"fooB" => [ "b1", "b2", "b3"],
"fooC" => [ "c1", "c2", "c3"]
);
print_r( transpose( $foo ));
// Output like this:
Array (
[0] => Array (
[fooA] => a1
[fooB] => b1
[fooC] => c1
)
[1] => Array (
[fooA] => a2
[fooB] => b2
[fooC] => c2
)
[2] => Array (
[fooA] => a3
[fooB] => b3
[fooC] => c3
)
);