Group 2d array by column value and concatenate values within each group - php

Question

I have a simple php array for location postcode and their name. I want compress 'code' by 'name'. This code from WooCommerce database zones.
$new_arr = [
[
'name' => 'Jambi Selatan',
'code' => '36139',
'code_name' => '36139 - Jambi Selatan'
],
[
'name' => 'Jambi Selatan',
'code' => '36137',
'code_name' => '36137 - Jambi Selatan'
],
[
'name' => 'Bagan Pete',
'code' => '36129',
'code_name' => '36129 - Bagan Pete'
],
[
'name' => 'Bagan Pete',
'code' => '36127',
'code_name' => '36127 - Bagan Pete'
]
];
I want get final result combined by 'name' and 'code' like this: i try array_unique method but not working.
Array (
[0] => Array
(
[name] => Jambi Selatan
[code] => 36139, 36137
[code_name] => 36139, 36139 - Jambi Selatan
)
[1] => Array
(
[name] => Bagan Pete
[code] => 36127, 36129
[code_name] => 36127, 36129 - Bagan Pete
)
)
I try this method, but not fix at 'code_name'
$out = array();
foreach ($new_arr as $key => $value){
if (array_key_exists($value['name'], $out)){
$out[$value['name']]['code'] .= ', '.$value['code'];
} else {
$out[$value['name']] = array(
'name' => $value['name'],
'code' => $value['code'],
'code_name' => $value['code'] . ' - ' . $value['name']
);
}
}
$out = array_values($out);
print_r($out);

Answer 1

You have to check duplicate name by in_array and update exist array value .If not exist insert that value to $out array .
$out = array();
foreach($new_arr as $k=>$v) {
//empty array state
if(count($out) == 0) {
$out[] = $v;
continue;
}
foreach ($out as $key => $value) {
if(in_array($v["name"],$value)) {
$out[$key]["code"] .= ",".$v["code"];
//for the code_name output as OP described
$nn = explode("-", $value["code_name"]);
$l = count($nn) - 1;
unset($nn[$l]);
$out[$key]["code_name"] = implode($nn).",".$v["code_name"];
break;
} else {
if((count($out)-1) == $key) {
$out[] = $v;
}
}
}
}
var_dump($out);

Answer 2

For someone have problem like me, this method for fix it:
$out = array();
foreach ($new_arr as $key => $value){
if (array_key_exists($value['name'], $out)){
$out[$value['name']]['code'] .= ', '.$value['code'];
$out[$value['name']]['code_name'] .= ', '.$value['code'] . ' - ' . $value['name'];
} else {
$out[$value['name']] = array(
'name' => $value['name'],
'code' => $value['code'],
'code_name' => $value['code']
);
}
}
$out = array_values($out);
print_r($out);
Final result;
Array
(
[0] => Array
(
[name] => Jambi Selatan
[code] => 36139, 36137
[code_name] => 36139, 36137 - Jambi Selatan
)
[1] => Array
(
[name] => Bagan Pete
[code] => 36129, 36127
[code_name] => 36129, 36127 - Bagan Pete
)
)

Answer 3

Please try below one as another approach:
<?php
$arr = Array (
Array
(
'name' => 'Jambi Selatan',
'code' => '36139',
'code_name' => '36139 - Jambi Selatan'
),
Array
(
'name' => 'Jambi Selatan',
'code' => '36137',
'code_name' => '36137 - Jambi Selatan'
),
Array
(
'name' => 'Bagan Pete',
'code' => '36129',
'code_name' => '36129 - Bagan Pete'
),
Array
(
'name' => 'Bagan Pete',
'code' => '36127',
'code_name' => '36127 - Bagan Pete'
)
);
$newarr = array();
$finalArr = array();
foreach($arr as $aa) {
$newarr[$aa['name']][] = $aa;
}
foreach($newarr as $kk => $bb) {
foreach($bb as $cc) {
$finalArr[$kk]['name'] = $cc['name'];
if(isset($finalArr[$kk]['code'])) {
$finalArr[$kk]['code'] = $finalArr[$kk]['code'].','.$cc['code'];
} else {
$finalArr[$kk]['code'] = $cc['code'];
}
if(isset($finalArr[$kk]['code_name'])) {
$finalArr[$kk]['code_name'] = $finalArr[$kk]['code_name'].','.$cc['code_name'];
} else {
$finalArr[$kk]['code_name'] = $cc['code_name'];
}
}
}
echo "<pre>";
print_r($finalArr);
echo "</pre>";
?>

Answer 4

Definitely avoid any suggestions that use more than one loop to group and concatenate the data.
I do endorse #Opsional's snippet. An alternative approach is to push reference variables into the result array, then only concatenate comma-separated values to the appropriate reference variable.
Code: (Demo)
$result = [];
foreach ($arr as $row) {
if (!isset($ref[$row['name']])) {
$ref[$row['name']] = $row;
$result[] = &$ref[$row['name']];
} else {
$ref[$row['name']]['code'] .= ', ' . $row['code'];
$ref[$row['name']]['code_name'] .= ', ' . $row['code_name'];
}
}
var_export($result);
For any purist developers that insist on destroying references, call unset($ref) after the loop.
Here is a streamlined version of #Opsional's snippet: (Demo)
$result = [];
foreach ($arr as $row) {
if (!isset($result[$row['name']])) {
$result[$row['name']] = $row;
} else {
$result[$row['name']]['code'] .= ', ' . $row['code'];
$result[$row['name']]['code_name'] .= ', ' . $row['code_name'];
}
}
var_export(array_values($result));