array_multisort() not working

[michael nieuwenhuizen]

<newbie alert>

i have 2 related arrays that i wanna sort at once. if i try:

print_r($my_array1);
array_multisort($my_array1, SORT_ASC, $my_array2, SORT_ASC);
print_r($my_array1);

both arrays remain unsorted. if i try:

print_r($my_array1);
sort($my_array1);
print_r($my_array1);

$my_array1 gets sorted. what am i doing wrong? both arrays
are indexed array and they have an equal amount of entries.

mike

[Andy Hassall]

On Tue, 13 Jan 2004 17:06:47 +0100, "michael nieuwenhuizen" <us****@mikkie.net>
wrote:

<newbie alert>

i have 2 related arrays that i wanna sort at once. if i try:

print_r($my_array1);
array_multisort($my_array1, SORT_ASC, $my_array2, SORT_ASC);
print_r($my_array1);

both arrays remain unsorted. if i try:

print_r($my_array1);
sort($my_array1);
print_r($my_array1);

$my_array1 gets sorted. what am i doing wrong? both arrays
are indexed array and they have an equal amount of entries.

PHP version?
Can you post example data (i.e. something runnable) and output?

--
Andy Hassall <an**@andyh.co.uk> / Space: disk usage analysis tool
<http://www.andyh.co.uk> / <http://www.andyhsoftware.co.uk/space>

[michael nieuwenhuizen]

"Andy Hassall" <an**@andyh.co.uk> wrote

i have 2 related arrays that i wanna sort at once. if i try:

print_r($my_array1);
array_multisort($my_array1, SORT_ASC, $my_array2, SORT_ASC);
print_r($my_array1);

both arrays remain unsorted. if i try:

print_r($my_array1);
sort($my_array1);
print_r($my_array1);

$my_array1 gets sorted. what am i doing wrong? both arrays
are indexed array and they have an equal amount of entries. PHP version?

4.3.2.
Can you post example data (i.e. something runnable)
not sure if it's a good idea to post this all, but here we go.

==== code =============

<?php

$file = 'dvds.xml';

$current_tag = "";
$current_item = -1;

// init arrays
$year = array(); // year
$var1 = array(); // dvd: name; cd: artist; travel: country

// start element
function startElement($parser, $tagname, $attrs) {
global $current_item, $current_tag;
$current_tag = $tagname;
switch ($tagname) {
case "ITEM":
$current_item++;
$year[$current_item] = 0;
$var1[$current_item] = "";
break;
}
}

// end element
function endElement($parser, $tagname) {
}

// character data
function characterData($parser, $data) {
global $current_item, $current_tag, $year, $var1;
switch ($current_tag) {
case "YEAR":
if ($year[$current_item] == 0) {
$year[$current_item] = $data;
}
break;
case "VAR1":
if ($var1[$current_item] == "") {
$var1[$current_item] = $data;
}
break;
}
}

// set parser variables
$xml_parser = xml_parser_create();
xml_parser_set_option($xml_parser, XML_OPTION_CASE_FOLDING, true);
xml_set_element_handler($xml_parser, "startElement", "endElement");
xml_set_character_data_handler($xml_parser, "characterData");

// file not found
if (!($fp = fopen($file, "r"))) {
die("could not open XML input");
}

// xml error
while ($data = fread($fp, 4096)) {
if (!xml_parse($xml_parser, $data, feof($fp))) {
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
}
}

// free parser
xml_parser_free($xml_parser);

sort_dvds();
print_dvds();

// sort dvds
function sort_dvds() {
global $sort, $year, $var1;
// sort by year
array_multisort($year, SORT_ASC, $var1, SORT_ASC);
}

// print dvds
function print_dvds() {
global $current_item, $sort, $year, $var1;
// print by year
echo " <tr>\n <td class=\"pagetitle\">dvd's</td>\n </tr>\n";
$temp_year = 0;
for ($i = 1; $i <= $current_item; $i++) {
if ($year[$i] != $temp_year) {
echo " <tr>\n <td class=\"title\">$year[$i]</td>\n
</tr>\n";
$temp_year = $year[$i];
}
echo " <tr>\n <td class=\"text\">$var1[$i]</td>\n </tr>\n";
}
}

?>

==== code =============

it reads an xml file (http://mikkie.net/php/sort/dvds.xml), stores the
titles and years in two arrays ($var1 and $year) and tries to output
the list of movies by year.

maybe the script looks a bit funny, but a) it's part of a larger script
(sorting in different ways, sorting & outputting different xml files) and
b) i didn't know ANYTHING of php til monday last week.
and output?

http://mikkie.net/php/sort/data.php

mike