<?php
function array_not_unique(array $a): array
{
return array_diff_key(
$a,
array_unique($a)
);
}
$array = [
'apple',
'orange',
'pear',
'banana',
'apple',
'pear',
'kiwi',
'kiwi',
'kiwi'
];
var_export(array_not_unique($array));
- Output for 7.4.5, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
- array (
4 => 'apple',
5 => 'pear',
7 => 'kiwi',
8 => 'kiwi',
)
preferences:
74.62 ms | 402 KiB | 92 Q