Reorganizing a PHP array structure (arrays within arrays) - php

Question

I have this array within array which contains a lot of values:
183 =>
array (size=3)
0 => string 'DE' (length=2)
1 => string '2015-06-09' (length=10)
2 => string 'GK' (length=2)
184 =>
array (size=3)
0 => string 'DE' (length=2)
1 => string '2015-06-08' (length=10)
2 => string 'GL' (length=2)
185 =>
array (size=3)
0 => string 'FR' (length=2)
1 => string '2015-06-09' (length=10)
2 => string 'GN' (length=2)
186 =>
array (size=3)
0 => string 'FR' (length=2)
1 => string '2015-09-08' (length=10)
2 => string 'GO' (length=2)
0 is the country code. 1 is a date. 2 is a column on an Excel file.
I want to organize it in this way:
2015-06-09 =>
array (size=3)
DE =>
array (size=2)
column => GK
download => 666
FR =>
array (size=2)
column => GN
download => 777
2015-06-08 =>
array (size=3)
DE =>
array (size=2)
column => GL
download => 666
FR =>
array (size=2)
column => GO
download => 777
So the same date can show up more than once. if it gets to an array value with the same date - it inserts in it the country code with and its' column.
if it has more than 1 country - it adds a new country. (with the 'download' and column values).
I have this function:
function get_cols_to_array_by_date($array) {
$mainarr = array();
$last_in_arr = count($array);
for ($i=0; $i<$last_in_arr; $i++){
$mainarr[$array[$i][1]] = array( $array[$i][0]=> array('downloads'=> 666, 'col'=>$array[$i][2]) );
}
return $mainarr;
}
which outputs an array that runs over the country when it gets to the same date and doesn't give me an array of countries.
What part am I missing in my code?
Is there a simpler way to do it? ( PHP syntax shortcuts ;) )

Answer 1

Assuming that the downloads is the key of the initial array, and each element has 3 elements(date and 2 countries):
Code:
//demo array
$old = array(
555=>array(
0 => 'DE',
1 => '2015-06-09',
2 => 'GK'),
234=>array(
0 => 'DE',
1 => '2015-06-08',
2 => 'GL'),
123=>array(
0 => 'FR',
1 => '2015-06-09',
2 => 'GN')
);
$new = array();
foreach($old as $key=>$arrayValues)
{
if(!array_key_exists($arrayValues[1], $new)){ //check if there is already a key by date
$new[$arrayValues[1]] = array();
}
$new[$arrayValues[1]][$arrayValues[0]] = array('column'=>$arrayValues[2], 'downloads'=>$key); //append formated array
}
echo "<pre>";
var_dump($new);
echo "</pre>";
Output:
array(2) {
["2015-06-09"]=>
array(2) {
["DE"]=>
array(2) {
["column"]=>
string(2) "GK"
["downloads"]=>
int(555)
}
["FR"]=>
array(2) {
["column"]=>
string(2) "GN"
["downloads"]=>
int(123)
}
}
["2015-06-08"]=>
array(1) {
["DE"]=>
array(2) {
["column"]=>
string(2) "GL"
["downloads"]=>
int(234)
}
}
}

Answer 2

Try looping and checking if element exists, if not - add it.
$result = [];
foreach ($myArray as $key => $values) {
if (!isset($result[$values[1]])) {
$result[$values[1]] = [
$values[0] => [
'column' => $values[2],
'download' => $key,
]
];
} elseif (!isset($result[$values[1]][$values[0]])) {
$result[$values[1]][$values[0]] = [
'column' => $values[2],
'download' => $key,
];
}
}
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