<!-- Collection of code snippets by Arne Vajhøj -->
<!-- posted to eksperten.dk, usenet and other places (2002-now) -->
<?php
$data = array();
$data[] = array('id' => 1, 'val' => 1);
$data[] = array('id' => 2, 'val' => 2);
$data[] = array('id' => 3, 'val' => 2);
$data[] = array('id' => 4, 'val' => 4);
$data[] = array('id' => 5, 'val' => 4);
$data[] = array('id' => 6, 'val' => 4);
$valcnt = array_count_values(array_map(function($row) { return $row['val']; }, $data));
print_r($valcnt);
?>