How to transpose array elements? [duplicate] - php

Question

This question already has answers here:
Transposing multidimensional arrays in PHP
(12 answers)
Closed 11 months ago.
I have an array $categories in php as follows.
Array
(
[item_name] => Array
(
[0] => I-Phone
[1] => samsung
[2] => nokia
[3] => htc
)
[item_price] => Array
(
[0] => 30.00
[1] => 20
[2] => 10
[3] => 15
)
)
And I want to transpose its element as,
Array
(
[0] => Array
(
[item_name] => I-Phone
[item_price] => 30.00
)
[1] => Array
(
[item_name] => samsung
[item_price] => 20
)
[2] => Array
(
[item_name] => nokia
[item_price] => 10
)
[2] => Array
(
[item_name] => htc
[item_price] => 15
)
)
I've tried using foreach loop but not working.
$count=0;
foreach ($categories as $key=> $category)
{
$categories[$count] = $category[$key];
$categories[$count] = $category[$key];
$count++;
}

Answer 1

Here's an approach:
$categories = array(
'item_name' => array('I-Phone', 'samsung', 'nokia','htc'),
'item_price' => array('30.00', '20', '10', '15')
);
$out = array();
foreach($categories as $key => $a){
foreach($a as $k => $v){
$out[$k][$key] = $v;
}
}
echo '<pre>';
print_r($out);
echo '</pre>';

Answer 2

Simple solution using array_keys and array_map functions:
$keys = array_keys($categories);
$transposed = array_map(function($a, $b) use($keys){
return [$keys[0] => $a, $keys[1] => $b];
}, $categories['item_name'], $categories['item_price']);
print_r($transposed);
The output:
Array
(
[0] => Array
(
[item_name] => I-Phone
[item_price] => 30
)
[1] => Array
(
[item_name] => samsung
[item_price] => 20
)
[2] => Array
(
[item_name] => nokia
[item_price] => 10
)
[3] => Array
(
[item_name] => htc
[item_price] => 15
)
)

Answer 3

Something like this:
$categories = array(); // your array
$ctg_names = array_keys($categories); // get names of source array keys
$new_ctgs = array(); // result array
// iterate over first key values to get indexes
foreach ($categories[$ctg_names[0]] as $k => $v) {
$ctg = array();
// iterate over all key names
foreach ($ctg_names as $name) {
$ctg[$name] = $categories[$name][$k];
}
$new_ctgs[] = $ctg;
}
print_r($new_ctgs);

Answer 4

Try this:
<?php
$array = Array
(
'item_name' => Array
(
'0' => 'I-Phone',
'1' => 'samsung',
'2' => 'nokia',
'3' => 'htc',
),
'item_price' => Array
(
'0' => 30.00,
'1' => 20,
'2' => 10,
'3' => 15,
)
);
$keys = array_keys($array);
$result = array();
for($i = 0; $i < count($array['item_name']); $i++)
{
$tempArray = array();
foreach($keys as $key)
$tempArray[$key] = $array[$key][$i];
$result[] = $tempArray;
}
Output:
Array
(
[0] => Array
(
[item_name] => I-Phone
[item_price] => 30
)
[1] => Array
(
[item_name] => samsung
[item_price] => 20
)
[2] => Array
(
[item_name] => nokia
[item_price] => 10
)
[3] => Array
(
[item_name] => htc
[item_price] => 15
)
)

Answer 5

$result = [];
foreach($categories['Item_name'] as $key => $data){
$result[$key]['category'] = $categories['Item_name']['$key'];
$result[$key]['price'] = $categories['price'][$key];
}
dd($result);