gistfile1.php

<?php

$myarray = array('response' => array('players' => array(array(
       'SteamId' => '12345678901234567',
       'CommunityBanned' => false,
       'VACBanned' => true,
       'NumberOfVACBans' => 1,
       'DaysSinceLastBan' => 1,
       'EconomyBan' => 'none'
))));

// Prints "BANNED"
print ($myarray['response']['players'][0]['VACBanned'] ? 'BANNED' : 'NOT BANNED');