You can sort arrays by key with ksort() and krsort().
<?php
$inventory = array(
'orange' => 3,
'blue' => 5,
'green' => 7,
'red' => 12,
'white' => 8,
'teal' => 1
);
print_r($inventory);
print "<br>";
ksort($inventory);
print_r($inventory);
print "<br>";
krsort($inventory);
print_r($inventory);
?>
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