How to only display 10 <li> items in a <ul> with php - php

Question

I have a problem using tcpdf. A form on my page sends a post variable containing content with <li></li> items.
$fzg_features = '<li>' . $_POST['fzg-features'] . '</li>';
I was able to count all <li> items but i only want to display item 1-10.
Is it possible to index the <li> items with php and manage the output? e.g. 4-6 of all list items?
The problem is the source of $_POST['fzg-features']. It comes from a wp plugin writing the whole content as <li></li> items in an array key as a single string.

Answer 1

When it comes as single string you can explode </li> and then remove <li>.
$pizza = "<li>example</li><li>another example</li>"; // Example string
$pieces = explode("</li>", $pizza); // Make many small pieces
foreach ($pieces as $key => $piece) { // Go through all pieces
if ($key === 9) break; // First key in array is 0, so we limit it to 9.
echo substr($piece, 2); // Remove first 2 characters
}

Answer 2

Great, I stand in your debt. Works fine for me. My main issue was to calculate columns for displaying Car features in tcpdf as a 3 column list. As it is not possible using css this solution worked for me:
$fzg_features = $_POST['fzg-features'];
// $pieces holds the array
$pieces = explode("</li><li>", $fzg_features); // Make many small pieces
foreach ($pieces as $key => $piece) { // Go through all pieces
}
// column calculation
$columns = 3;
$colamount = count($pieces) / $columns;
$colamount1 = ceil($colamount);
$colamount2 = ceil($colamount)*2;
// first column
for ($i = 0; $i <= $colamount1 -1; $i++){
echo '<li>' . $pieces[$i] . '</li>';
};
echo '<br><br>';
// second column
for ($i = $colamount1; $i <= $colamount2 -1; $i++){
echo '<li>' . $pieces[$i] . '</li>';
};
echo '<br><br>';
// third column
for($i = $colamount2; $i <= count($pieces)-1; $i++){
echo '<li>' . $pieces[$i] . '</li>';
};
Thanks a lot for your help.