- array_count_values: documentation ( source)
- print_r: documentation ( source)
- array_filter: documentation ( source)
<?php
$data =[1, 63, 1, 2, 2, 'a', 'b', '1', 'b'];
$data = array_filter($data, function ($value) use ($data) {
return !(array_count_values($data)[$value] > 1);
});
print_r($data);