PHP Nested list from a text file - php

Question

I have textfile "animals.txt" which looks like:
mammals cat, fox, horse
birds parrot, eagle
reptiles snake, crocodile
Columns are separated with \t and ,.
How can I display it as nested list looking like this:
<ul>
<li>mammals
<ul>
<li>cat</li>
<li>fox</li>
<li>horse</li>
</ul>
</li>
<li>birds
<ul>
<li>parrot</li>
<li>eagle</li>
</ul>
</li>
<li>reptiles
<ul>
<li>snake</li>
<li>crocodile</li>
</ul>
</li>
</ul>
What I have now:
$data = file_get_contents('animals.txt');
$array = explode("\t", $data);
foreach ($array as $line) {
echo "<li>$line</li>";
}

Answer 1

This will work. Exploding each line and then printing the corresponding ul's and li's:
$file = file('animals.txt');
print '<ul>';
foreach ($file as $line) {
// 1) exploding by "\t" and then again by ","
$values = explode("\t", $line);
$list = explode(',', $values[1]);
// 2) show the first name in the line
print '<li>';
print $values[0];
print '<ul>';
// 3) followed by a nested ul containing the comma-separated values
foreach ($list as $sub_item) {
print '<li>' . $sub_item . '</li>';
}
print '</ul>';
print '</li>';
}
print '</ul>';

Answer 2

This will work. The first step is to separate values that are tab delimited(mammals cat, fox, horse) and second step(foreach loop) is to get comma delimited values(cat, fox, horse). Finally we are printing individual values in a list(cat fox etc).
echo "<ul>";
$array = explode("\t", $data);
echo "<li>".$array[0];
foreach ($array[1] as $line) {
$values = explode(",",$line)
echo "<ul>"
foreach ($values as $val) {
echo "<li>$val</li>";
}
echo "<.ul>"
}
echo "</li>";
echo "</ul>";