- array_slice: documentation ( source)
- print_r: documentation ( source)
<?php
$a = array('9002209000'=>22.58,
'3915909000'=>21.35,
'8512302000'=>20.06,
'7207190000'=>19.79,
'6306120000'=>18.17,
'5513130000'=>17.74,
'7208400000'=>17.57,
'7210492000'=>17.17,
'0904209000'=>16.99
);
echo "<pre>";
$b = array_slice($a, 0, 20, true);
print_r($b);
echo "</pre>";