PHP Delete txt line and then remove line works BUT if the delete is the last line, it won't remove blank line

Question

Use code below to delete a line from a text file. If the deleted item is NOT the last element, it works fine. Deletes the line entirely.

    $panel_dir = 'host.txt';
    $panel_data = file($panel_dir);
    $panel_out = array();
    foreach($panel_data as $panel_line) {
        if(trim($panel_line) != $panel_del) {
            $panel_out[] = $panel_line;
        }
    }

    $f_panel = fopen($panel_dir, "w+") or die("Error");
    foreach($panel_out as $panel_line) {
        fwrite($f_panel, $panel_line);
    }
    fclose($f_panel);  
}

BUT if the deleted item is the LAST element, it will remove the line and then leave a blank line.

Open to better methods for deleting the entire line from text file.

Answer 1

Use the array_map to trim all the lines. Use the unset to delete the matching item from the array. You don't need to use the $panel_out variable. Then use the implode to turn the array into a string separated by a new line.

$panel_dir = 'host.txt';
$panel_data = array_map('trim', file($panel_dir));

foreach($panel_data as $key => $panel_line) {
    if($panel_line == $panel_del) {
        unset($panel_data[$key]);
    }
}

$f_panel = fopen($panel_dir, "w+") or die("Error");
fwrite($f_panel, implode("\n", $panel_data));
fclose($f_panel);