- var_dump: documentation ( source)
- array_column: documentation ( source)
<?php
$users = array(array('name' => 'a'),
array('name' => 'b'),
array('name' => 'c'),
array('name' => 'd'),
array('name' => 'e'),
array('name' => 'f'),
array('name' => 'g')
);
$names = array_column($users, 'name');
var_dump($names);