Check form fields on php - php

Question

I want to check form fields on PHP. I have tried but I don't get any message. I am not sure why.
I use mongodb database, and I'm new in PHP.
My PHP code so far:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>"
method="post">
<h3> Name :</h3>
<p>
<input type="text" name="username" id="title/">
</p>
<h3>Title :</h3>
<p>
<input type="text" name="title" id="title/">
</p>
<h3>Content :</h3>
<textarea id="content" name="content" rows="20" cols="100"></textarea>
<p>
<br/>
<input type="submit" name="btn_submit" value="Save"/>
</p></form>
</center>
<?php
if (isset($_POST['btn_submit']))
{
$title = $_POST['title'];
$content = $_POST['content'];
if (!isset($title) || empty($title))
{
echo " <h2> check title ! </h2>";
}
if (!isset($content) || empty($content))
{
echo " <h2> check content ! </h2>";
}
}
?>
<?php
else: ?>
<p>
success. _id:<?php echo $article['_id']; ?>.
<a href="blogpost.php">
write other articles ?</a>
</p>
<?php endif; ?>

Answer 1

Just reviewed your code. I think it has a few problems, but the main one is in the if-else sequence.
<form action="<?php echo $_SERVER['PHP_SELF']; ?>"
method="post">
<h3> Name :</h3>
<p>
<input type="text" name="username" id="title/">
</p>
<h3>Title :</h3>
<p>
<input type="text" name="title" id="title/">
</p>
<h3>Content :</h3>
<textarea id="content" name="content" rows="20" cols="100"></textarea>
<p>
<br/>
<input type="submit" name="btn_submit" value="Save"/>
</p></form>
</center>
<?php
if (isset($_POST['btn_submit']))
{
$title = $_POST['title'];
$content = $_POST['content'];
if (!isset($title) || empty($title))
{
echo " <h2> check title ! </h2>";
}
if (!isset($content) || empty($content))
{
echo " <h2> check content ! </h2>";
}
?>
<?php } else { ?>
<p>
<?php echo $article['_id']; ?>.
<a href="blogpost.php">
write other articles ?</a>
</p>
<?php } ?>

Answer 2

You have syntax error in if else statement and also there is undefined varibale $article['_id']. Where do you get that value from? Other than that the code is fine. Here is the updated code:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>"
method="post">
<h3> Name :</h3>
<p>
<input type="text" name="username" id="title/">
</p>
<h3>Title :</h3>
<p>
<input type="text" name="title" id="title/">
</p>
<h3>Content :</h3>
<textarea id="content" name="content" rows="20" cols="100"></textarea>
<p>
<br/>
<input type="submit" name="btn_submit" value="Save"/>
</p></form>
</center>
<?php
if (isset($_POST['btn_submit']))
{
$title = $_POST['title'];
$content = $_POST['content'];
if (!isset($title) || empty($title))
{
echo " <h2> check title ! </h2>";
}
else if (!isset($content) || empty($content))
{
echo " <h2> check content ! </h2>";
}
else
{
echo "<p>Success!!! <a href='blogpost.php'>
write other articles ?</a> </p>";
}
}
?>