Php isset inside an echo validation - php

Question

Hi I want to check the following validation:
echo '<div id="msg"><?php echo isset($msg)?$msg:''; ?></div>';
I know that is wrong, what is the correct way to do that?

Answer 1

You're already within the PHP realm, you're running PHP.. you can't start another PHP. Also single quote ' wont expand variables.
I'm running on a lot of assumptions from your project
Using your logic you could do this:
echo '<div id="msg">' . (isset($msg) ? $msg : '') . '</div>';
but it would be best to not just output the div when the variable isn't set
if(isset($msg)) {
echo "<div id=\"msg\">$msg</div>";
}
More info on what you're trying to achieve would let me educate you more on best practices.
Your edit suggestion still has you trying to start a new php block within a php
block.
You suggested to edit my answer (which was weird) with this:
echo '<div class="container">
<form action="includes/ajax.php" id="profilePictureUpload" class="dropzone">
<div class="fallback">
<input name="file" type="file" multiple />
</div>
</form>
<h1>Gallery</h1>
<div class="alert alert-warning my-2">
<i class="fa fa-2x fa-exclamation-circle float-right"></i>
<ol class="m-0">
<li>Image uploading limit is 5.</li>
<li>One image not more then 5MB.</li>
</ol>
</div>
<div id="msg"><?php echo isset($msg)?$msg:''; ?></div>
</div>';
If you had read what i posted, you need to replace that 1 <div id="msg"... with what i posted. Did you check?