How to edit multiple values in database in one time - php

Question

I am making an admin panel for my website.
I have problem editing many values in a database at one time.
My website is https://jaguarz.cf but the admin panel is not visible to common visitors and only i can control it
Warning: count(): Parameter must be an array or an object that implements Countable
I get this error while counting no of id s i want to change
if (isset($_POST['edit_features'])) {
$count=count($_POST['id_edit']);
for($i=0;$i<$count;$i++){
$sql1="UPDATE projects
SET name='" . $_POST['name_edit'][$i] . "',
link='" . $_POST['link_edit'][$i] . "',
rank='" . $_POST['rank_edit'][$i] . "'
WHERE id='" . $_POST['id'][$i] . "'";
$result1=mysqli_query($db,$sql1);
}
}
Here is an example of my form:
<form method="post" action="admin_panel" style="margin:auto;" class="resize form-style-8">
<div class="table-responsive" style="width:99%;">
<table class="table table-bordered">
<thead>
<tr>
<th style="color: rgb(0,0,0);font-size: 20px;">Id</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Name</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Link</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Rank</th>
</tr>
</thead>
<tbody>
<tr>
<td><input type="text" name="id_edit" value="1" readonly></td>
<td><input type="text" name="name_edit" value="Videos"></td>
<td><input type="text" name="link_edit" value="https://www.youtube.com/channel/UCXqIrdlG-gsfSGuFUt0v-1g"></td>
<td><input type="text" name="rank_edit" value="AAA"></td>
</tr>
<tr>
<td><input type="text" name="id_edit" value="2" readonly></td>
<td><input type="text" name="name_edit" value="Basic Message Encrypter And Decrypter"></td>
<td><input type="text" name="link_edit" value="project?page=en-decrypter"></td>
<td><input type="text" name="rank_edit" value="B"></td>
</tr>
<tr>
<td><input type="text" name="id_edit" value="5" readonly></td>
<td><input type="text" name="name_edit" value="Calculator"></td>
<td><input type="text" name="link_edit" value="project?page=calculator"></td>
<td><input type="text" name="rank_edit" value="E"></td>
</tr>
</tbody>
</table>
<div style="margin: 20px 0px 0px 0px">
<button type="submit" name="edit_features" class="btn btn-info text-justify" style="margin: 10px 0px 10px 0px; width:auto; text-align:center !important;">Edit Projects</button>
</div>
</div><br><br>
<div class="table-responsive" style="width:99%;">
<table class="table table-bordered">
<thead>
<tr>
<th style="color: rgb(0,0,0);font-size: 20px;">Id</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Name</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Link</th>
<th style="color: rgb(0,0,0);font-size: 20px;">Rank</th>
</tr>
</thead>
<tbody>
<tr>
<td>Auto Generated</td>
<td><input type="text" name="name_add"></td>
<td><input type="text" name="link_add"></td>
<td><input type="text" name="rank_add"></td>
</tr>
</tbody>
</table>
<div style="margin: 20px 0px 0px 0px">
<button type="submit" name="add_features" class="btn btn-danger text-justify" style="margin: 10px 0px 10px 0px; width:auto; text-align:center !important;">Add Projects</button>
</div>
</div>
</form>
I expect it to change all values at one time

Answer 1

There are couple of principal issues with your code:
<input type="text" name="id_edit" value="1" disabled>
(as per your original code)
In these inputs
1) disabled elements do not get submitted by the browser. You should change them to readonly (as you've already done in your edit)
2) name="id_edit" is repeated multiple times, but you can't have multiple items with the same name - the server will only see one of them. To make it submit an array of values under the same name, change it to name="id_edit[]". You need to do this for all your repeatable fields.
The last issue is a typo in your server code:
WHERE id='" . $_POST['id'][$i] . "'";
needs to be
WHERE id='" . $_POST['id_edit'][$i] . "'";
because you aren't submitting any field called id in your form.
Lastly I'm going to issue a broader warning, for an issue you need to rectify now you've got the form working on a basic level: Your code is vulnerable to SQL Injection attacks. You should use parameterised queries and prepared statements to help prevent attackers from compromising your database by using malicious input values. http://bobby-tables.com gives an explanation of the risks, as well as some examples of how to write your queries safely using PHP / mysqli. Never insert unsanitised data directly into your SQL. The way your code is written now, someone could easily steal, incorrectly change, or even delete your data.

Answer 2

you got that warning message because you pass a single value data inside form you need to modified attribute name in each tag input like this
<tr>
<td><input type="text" name="id_edit[]" value="1" readonly></td>
<td><input type="text" name="name_edit[]" value="Videos"></td>
<td><input type="text" name="link_edit[]" value="https://www.youtube.com/channel/UCXqIrdlG-gsfSGuFUt0v-1g"></td>
<td><input type="text" name="rank_edit[]" value="AAA"></td>
</tr>
<tr>
<td><input type="text" name="id_edit[]" value="2" readonly></td>
<td><input type="text" name="name_edit[]" value="Basic Message Encrypter And Decrypter"></td>
<td><input type="text" name="link_edit[]" value="project?page=en-decrypter"></td>
<td><input type="text" name="rank_edit[]" value="B"></td>
</tr>
as above you send an array to php that you can use count for every data has sent from the form and do your stuff on php as well.
but I tell you that way is not the best way.. maybe you can use
data[]['id_edit']
in name attribute as well so you just need to
count($_POST['data'])
without worrying about imbalance count for every data