Mysqli Insert Not Posting - php

Question

Can someone please help me understand, why my code is not inserting data into my database from this form? I can get it to Select and Echo the same info from the same database to the page but when I go to add new data through the form it never makes it to the db.
I'm not getting any errors at all and I have error reporting set at the top of my page. I even set a javascript alert to capture the values of the input when clicking the submit button and they return the true values. They just won't insert into the database.
What am I doing wrong here?
<?php
if(isset($_POST['addContent'])) {
$addTitle = $_POST['title'];
$addEntry = $_POST['entry'];
$sql = mysqli_query($conn, "INSERT INTO `basic` (`title, entry`) VALUES ('$addTitle', '$addEntry')") or die(mysqli_error($conn));
$result = mysqli_query($sql);
if(!$result) {
echo mysql_error($sql);
}
}
?>
<!-- Modal -->
<div class="modal fade" id="addContentModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Add Data</h4>
</div>
<div class="modal-body">
<form method="POST" action="">
<input type="hidden" name="addContent" id="addContent" value="1">
<div class="form-group">
<label for="title">Title</label>
<input id="addTitle" name="addTitle" type="text" class="form-control">
</div>
<div class="form-group">
<label for="entry">Entry</label>
<textarea id="addEntry" name="addEntry" class="form-control" ></textarea>
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<button type="submit" id="saveAddBtn" class="btn btn-primary" data-dismiss="modal">Save changes</button>
</div>
</div>
</div>
</div>
UPDATE:
Ok so here's my attempt at addressing some of the issues you all have enlightened me to. Still same result...any other ideas?
<?php
if(isset($_POST['addContent'])) {
$addTitle = $_POST['title'];
$addEntry = $_POST['entry'];
if($addTitle != "" && $addEntry != "")
{
$sql = $conn->prepare("INSERT INTO basic VALUES ('',?,?)");
$sql->bind_param('sss', $addTitle, $addEntry);
$result = mysqli_query($sql);
if(!$result) {
echo mysqli_error($sql);
}
}
}
?>
<!-- Modal -->
<div class="modal fade" id="addContentModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">×</span></button>
<h4 class="modal-title" id="myModalLabel">Add Data</h4>
</div>
<div class="modal-body">
<form method="POST" action="">
<input type="hidden" name="addContent" id="addContent" value="1">
<div class="form-group">
<label for="title">Title</label>
<input id="addTitle" name="title" type="text" class="form-control">
</div>
<div class="form-group">
<label for="entry">Entry</label>
<textarea id="addEntry" name="entry" class="form-control" ></textarea>
</div>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<input type="submit" id="saveAddBtn" class="btn btn-primary" data-dismiss="modal" value="Save changes">
</div>
</div>
</div>
</div>

Answer 1

The problem are these lines:
$sql = mysqli_query($conn, "INSERT INTO `basic` (`title`, `entry`) VALUES ('$addTitle', '$addEntry')") or die(mysqli_error($conn));
$result = mysqli_query($sql);
Remove the first mysqli_query and set $sql to equal just the string, this will give you the result and not the result of the result (it'll return boolean false when using the result as a query) and also, backtick each column name singularly, not as a whole :)

Answer 2

change your query to:
$sql = mysqli_query($conn, "INSERT INTO `basic` (`title`, `entry`) VALUES ('$addTitle', '$addEntry')") or die(mysqli_error($conn));
The backticks are affecting the query. Note that the back ticks are around each column individualy not around all of them. The way you have it would suggest you have a column called title, entry. You should also remove the $result line because the query has been executed already. Now you also have to change the if statement to if (! $sql).
Update
<?php
if(isset($_POST['addContent'])) {
$addTitle = $conn->real_escape_string($_POST['title']);
$addEntry = $conn->real_escape_string($_POST['entry']);
if(!empty($addTitle) && !empty($addEntry)) // There is a function for this
{
// Because you are only inserting 2 values there only need to be 2 `?` and 2 parameters
$sql = $conn->prepare("INSERT INTO `basic` (`title`, `entry`) VALUES (?,?)"); // Added column names just to be sure values are inserted on correct columns
$sql->bind_param('ss', $addTitle, $addEntry); // Note the 2 "s" not 3
$sql->execute();
if($sql->affected_rows < 1 ) {
echo $sql->error(); // Don't know for shure what this should be `error` or `error()`
}
}
}
?>

Answer 3

I can't believe none of us caught this sooner. But my submit button was not even inside the form tag! My buddy pointed this out and it fixed the issue. Thanks for trying everyone!

Answer 4

change your query to:
$sql = mysqli_query($conn, "INSERT INTO `basic` (title, entry) VALUES ('$addTitle', '$addEntry')") or die(mysqli_error($conn));
The backticks are affecting the query.