PHP. How to place an element between specific tags?

Question

Hi all! I really need your help!
How to place an element between specific tags?

my code.. unfortunately it doesn't work, no data is saved

$filename = $_COOKIE['user'].'1234.txt';
$old_list = file_get_contents($filename);
$temp_list = new DOMDocument();
$temp_list->loadHTML($old_list);
$sector = $temp_list->getElementById('first_list');
$fragment = $temp_list->createDocumentFragment();
$fragment->appendXML('<div>Hello, world!</div>');
$sector->appendChild($fragment);
$temp_list->saveHTML();
file_put_contents($filename, $temp_list);

what could be the error?
I'll be glad for any help!

Answer 1

I don't like asking any AI for help, but it wrote this:

It seems like you're attempting to insert a <div>Hello, world!</div> element into an existing <div> element with the ID 'first_list'. Your code looks mostly correct, but there are a few things to note:

1. Make sure that the element you're trying to target with the ID 'first_list' exists in your HTML file.
2. After making modifications to the DOM, you need to capture the modified HTML content and save it back to the file.
3. It's a good practice to check if the file exists and if it contains data before attempting to manipulate it.
Here's your code with some modifications and comments:

# code start

<?php
// Check if the user cookie is set and the file exists
if(isset($_COOKIE['user']) && file_exists($_COOKIE['user'].'1234.txt')) {
// Load the contents of the file
$filename = $_COOKIE['user'].'1234.txt';
$old_list = file_get_contents($filename);

// Create a DOMDocument object and load the HTML content
$temp_list = new DOMDocument();
$temp_list->loadHTML($old_list);

// Find the element by its ID
$sector = $temp_list->getElementById('first_list');

// Check if the element with the specified ID exists
if ($sector) {
// Create a document fragment and append the new div element
$fragment = $temp_list->createDocumentFragment();
$fragment->appendXML('<div>Hello, world!</div>');
$sector->appendChild($fragment);

// Get the modified HTML content
$new_html = $temp_list->saveHTML();

// Save the modified HTML content back to the file
file_put_contents($filename, $new_html);

echo "Element successfully inserted!";
} else {
echo "Element with ID 'first_list' not found.";
}
} else {
echo "User cookie is not set or file does not exist.";
}
?>

# code end

Answer 2

possible you didn't check if the element with the specified ID exists

Answer 3

Mihaly Nyilas
file .txt contains just html code

<div id="first_list"></div>
<div id="s_list"></div>
<div id="t_list"></div>

mb I'm using getElementById incorrectly?
how can this be fixed?

Answer 4

now I tried more simple code, but still nothing worked.. nothing is saved

$filename = $_COOKIE['user'].'1234.txt';
$old_list = file_get_contents($filename);
$doc = new DOMDocument();
$doc->loadHTML($old_list);
$f = $doc->createDocumentFragment();
$f->appendXML("<foo>text</foo><bar>text2</bar>");
$doc->documentElement->appendChild($f);
echo $doc->saveHTML();

Answer 5

and here is the rest of the help/suggestion:

Make sure that the file 'file.txt' contains valid HTML code with a <div> element having the ID 'first_list'. This script will attempt to insert the <div>Hello, world!</div> element into the 'first_list' <div> if it exists and the necessary conditions are met.

I hope this helps.
you can use some AI tools for free.

it said what I wrote in my first comment.