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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function myFunc($arr)
{
$newArr = [];
$duplicate = [];
foreach($arr as $item) {
if(!in_array($item, $newArr)) {
$newArr[] = $item
} else {
$duplicate[] = $item;
}
}
return $duplicate;
}
$arr = [1, 2, 2, 3, 4,];
var_dump(myFunc($arr));