Its syntax is: void usort(array array, string function_name)
$vocab = array("S123","A1234", "P12345", "A1234567","T");
function compare_length($str1, $str2) {
$length1 = strlen($str1);
$length2 = strlen($str2);
if ($length1 == $length2) :
return 0;
elseif ($length1 < $length2) :
return -1;
else :
return 1;
endif;
}
usort($vocab, "compare_length");
while (list ($key, $val) = each ($vocab)) {
echo "$val
";
}
?>