PHP array Finding values based on two keys - php

Question

I have an array I got from a mysql query
key1 key2 value
10 2 url_A
10 1 url_B
9 3 url_C
9 2 url_D
9 1 url_E
7 1 url_f
I want to put it into this format in html.
<ul class="main">
<li id="10">
<ul>
<li>url_A</li>
<li>url_B</li>
</ul>
</li>
<li id="9">
<ul>
<li>url_C</li>
<li>url_D</li>
<li>url_E</li>
</ul>
</li>
<li id="7">
<ul>
<li>url_F</li>
</ul>
</li>
</ul>
How can I use foreach() (or is there a better way) and get this done?
This is HOW I get my array now.
$result = mysql_query($sql) or die(mysql_error());
while($data = mysql_fetch_object($result)){
$Items[] = array(
'key1' => $data->pID1,
'key2' => $data->ID2,
'value' => $data->urlString,
);
}

Answer 1

You can build the array with two keys as well:
while ($data = mysql_fetch_object($result)) {
$Items[$data->pID1][$data->ID2] = $data->urlString;
}
And then assemble the whole thing together:
echo '<ul class="main">';
foreach ($Items as $pid => $data) {
printf('<li id="%s"><ul>', $pid);
foreach ($data as $item) {
printf('<li>%s</li>', htmlspecialchars($item, ENT_QUOTES, 'UTF-8'));
}
echo '</ul></li>';
}
echo '</ul>';
Btw, unless you're using HTML5, you shouldn't use numeric identifiers for your elements.

Answer 2

<?php
$arr[10][2] = "url_A";
$arr[10][1] = "url_B";
$arr[9][3] = "url_C";
$arr[9][2] = "url_D";
$arr[9][1] = "url_E";
$arr[7][1] = "url_F";
?>
<ul class="main">
<?php
foreach ($arr as $key => $val) {
echo "<li id='$key'>\n\t<ul>";
foreach ($val as $item_key => $item) {
echo "\n\t<li>$item</li>";
}
echo "\n\t</ul>\n</li>\n";
}
?>
</ul>