<?php
$array = [['a', 1], ['b', 1], ['c',2], ['d',2]];
$result = [];
foreach ($array as $row) {
$result[$row[1]][] = $row;
}
var_export($result);
echo "\n---\n";
var_export(
array_reduce(
$array,
function ($carry, $row) {
$carry[$row[1]][] = $row;
return $carry;
}
)
);
- Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7
- array (
1 =>
array (
0 =>
array (
0 => 'a',
1 => 1,
),
1 =>
array (
0 => 'b',
1 => 1,
),
),
2 =>
array (
0 =>
array (
0 => 'c',
1 => 2,
),
1 =>
array (
0 => 'd',
1 => 2,
),
),
)
---
array (
1 =>
array (
0 =>
array (
0 => 'a',
1 => 1,
),
1 =>
array (
0 => 'b',
1 => 1,
),
),
2 =>
array (
0 =>
array (
0 => 'c',
1 => 2,
),
1 =>
array (
0 => 'd',
1 => 2,
),
),
)
- Output for 8.3.5
- Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
array (
1 =>
array (
0 =>
array (
0 => 'a',
1 => 1,
),
1 =>
array (
0 => 'b',
1 => 1,
),
),
2 =>
array (
0 =>
array (
0 => 'c',
1 => 2,
),
1 =>
array (
0 => 'd',
1 => 2,
),
),
)
---
array (
1 =>
array (
0 =>
array (
0 => 'a',
1 => 1,
),
1 =>
array (
0 => 'b',
1 => 1,
),
),
2 =>
array (
0 =>
array (
0 => 'c',
1 => 2,
),
1 =>
array (
0 => 'd',
1 => 2,
),
),
)
preferences:
135.14 ms | 403 KiB | 154 Q