- array_search: documentation ( source)
- array_slice: documentation ( source)
- var_export: documentation ( source)
- array_values: documentation ( source)
<?php
$array = [
1 => 'admin',
'5d1acff7-51f5-d10a-8807-5ce3a25f3f01' => 'atul',
'9324e078-e651-09ab-856c-5d00cf1d6302' => 'tushar',
'3e4d9711-e4e0-f9de-8d40-5d021f3137fb' => 'praful',
'b283b589-c527-389f-498b-5cf0ea2338e1' => 'suraj'
];
$values = array_values($array);
$offset = array_search('atul', $values);
if ($offset !== false && isset($values[++$offset])) {
var_export(array_slice($array, $offset, 1, true));
} else {
echo "not found or no next";
}