- array_count_values: documentation ( source)
- array_column: documentation ( source)
<?php
$arr = [
["name" => "Martin", "type" => "0"],
["name" => "Jack", "type" => "0"],
["name" => "Tiam", "type" => "1"],
];
echo array_count_values(array_column($arr, 'type'))[1];