<?php
$array = [1, 1, 2, 3, 4, 5, 6, 7, 9, 9, 10];
$result = [];
foreach ($array as $index => $value) {
if (!isset($result[$value])) {
$result[$value] = $index;
} else {
$result[$value] .= ",$index";
}
}
var_export(array_values($result));
- Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.26, 8.4.1 - 8.4.13
- array (
0 => '0,1',
1 => 2,
2 => 3,
3 => 4,
4 => 5,
5 => 6,
6 => 7,
7 => '8,9',
8 => 10,
)
- 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 (
0 => '0,1',
1 => 2,
2 => 3,
3 => 4,
4 => 5,
5 => 6,
6 => 7,
7 => '8,9',
8 => 10,
)
preferences:
133.37 ms | 408 KiB | 5 Q