PHP：将表格行添加到HTML文件

Question

I'm trying to add a table row generated in PHP to a HTML file. Actually I've done this with a simple HTML form and some PHP code, but I would like the new row to be added at the top of the table, not at the bottom... (It's going to be a to-do list for my homework, but without checkboxes.)

Here's the PHP code:

<?php
$file = fopen("index.php","a+") or exit("Unable to open file!");
$since = $_POST["since"];
$since2 = "<tr><td class=\"since\">$since</td>";
$due = $_POST["due"];
$due2 = "<td class=\"due\">$due</td></tr>
";
$user = $_POST["user"];
$user2 = "<td class=\"content\">$user</td>";

if ($_POST["since"] <> "");
{
    fwrite ($file,"$since2$user2$due2");
}

fclose($file);
?>

Can anyone help me? (Yeah I know the code isn't clean because it's my first attempt to write PHP.)

Here's an example of a tr made with the code:

<tr><td class="since">Thu 22th  Nov</td><td class="content">example</td><td class="due">Tue 27th  Nov</td></tr>

My main point is to have a new tr added on the top! Really appreciate any help! (I've looked around and hope this question hasn't been asked yet.)

Answer 1

To add it to the beginning of the file, you can read its contents, add it to the end of your new row, and then write the whole thing back to the file.

// read the original file
$original_list = file_get_contents("index.php");

// use the writing mode to overwrite the file
$file = fopen("index.php","w") or exit("Unable to open file!");

$since = $_POST["since"];
$since2 = "<tr><td class=\"since\">$since</td>";

$user = $_POST["user"];
$user2 = "<td class=\"content\">$user</td>";

$due = $_POST["due"];
$due2 = "<td class=\"due\">$due</td></tr>
";

if ($_POST["since"] <> "");
{
    fwrite($file,"$since2$user2$due2$original_list");
}

fclose($file);

This is not the optimal way to build a to-do list, but we don't know enough about your homework and the requirements to further improve the answer.

Another tip: Avoid using meaningless variable names like $since2 and $due2, even if they are temporary in nature. By using better names like $since_cell and $due_cell, the code becomes much easier to understand, even without comments.