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How concatenate a PHP variable into a HTML link?

i need to concatenate this variable $idCantiere into a href attribute
<a class="btn btn-primary" href="../../../paginaIniziale/sceltaModificaAffidatario.php?idCantiere='.$idCantiere.'">Continua -></a> `
In other words, I need that when I press the "Continua->" button, I will be redirected to the HREF page but with the addition, at the end of the link, of the "idCantiere"

Try the following:
<a class="btn btn-primary" href="../../../paginaIniziale/sceltaModificaAffidatario.php?idCantiere=<?php echo $idCantiere ?>Continua -></a>
What this does is the following:
opens <?php tags so we can write php.
echo your variable in the html template
Close the php by ?>
When you use echo in php it will output the value of a variable to the actual HTML file that will be produced. Thus you use echo when you need to output something dynamic into the html.

Here are two possible solutions:
https://www.tehplayground.com/rpPcUnram5TAxdAs
Have fun!
edit:
sorry for that here is the code:
No 1:
<?php
$idCantiere = 123;
print '<a class="btn btn-primary" href="../../../paginaIniziale/sceltaModificaAffidatario.php?idCantiere='.$idCantiere.'">Continua -></a>';
?>
No 2:
<?php
$idCantiere = 123;
?>
....
<a class="btn btn-primary" href="../../../paginaIniziale/sceltaModificaAffidatario.php?idCantiere=<?php print $idCantiere; ?>">Continua -></a>

How to change a href when using multiple variables in PHP?

So I didn't found what I was looking for in last two days.
To be clear I have a table "tracks" in my database.
So I can show from "tracks" the "demo" field wich is an audio file "url"..
<?= $tracks['demo']; ?>
I have multiple url's but then I need to replace the a href
<a href="<?php echo $tracks['demo'];?>"
in a logical way.
In simple terms it's like I want to click on button 1 that loads
url 1 into this a href with the ID, title field from that track.
When you press button 2 you need to load another url and replace url 1 with url2.
I tried many ways including javascript but it won't work.
Problem now is that when I list 4 items it always loads the latest "URL" i have posted in my source code. :)
When I echo out <?php echo $tracks['demo]; ?> on all items I can see the correct url's so the functionality to replace the url is my issue.
* I basically want to load many mp3 url's in a player I made in the footer of my website. It works by hardcoding the urls in the url field but this is not what it should be... *
Code:
<?php while($tracks = mysqli_fetch_assoc($muziek)) : ?>
<div class="col-md-2 viny" id="muziek">
<h4><?= $tracks['title']; ?></h4>
<img src="<?= $tracks['img']; ?>"
alt=" <?= $tracks['title']; ?> />
<p class="artist">Artist: <?= $tracks['artist']; ?></p>
</div>
<?= $tracks['demo'] = $audiourl ; ?>
<button type="button" onclick="play">Play</button>
</div>
<?php endwhile; ?>
*THIS LOOPS PERFECT FOR ALL ITEMS TRACKS ARE LISTED PERFECT *
In my player I have
<a href="<?php echo $audiourl;?>" ><?= $tracks['artist']; ?></b> - <?= $tracks['title']; ?></a>
function play(){
I'm not good at JS... And this is my issue because it now loads the latest output from the php loop...
}

I don't know how you are replacing it but
Why not pass the audio in the function. Here like this
<button type="button" onclick="play(<?= $tracks['demo'] = $audiourl ; ?>)">Play</button>
assign a id to anchor tag
<a id="someId" href="<?php echo $audiourl;?>" ><?= $tracks['artist']; ?></b> - <?= $tracks['title']; ?></a>
and in the play function, you receive it like this
function play(audioUrl){
}
and change the href like this in the play function
If you are using jquery
$('#someId').attr("href", audioUrl);
sometimes the above does not works. Can't remember why but if that does not works try this
$('#someId').href = audioUrl
If you are using javascript
document.getElementById('abcd').href = audioUrl

So I tried many things but I had many issues with the player it's js file using the same id's and so on.
The new logic I tried out seems to work:
<form action="" method="POST">
<input type="submit" value="Play" name="Play">
</form>
<?php
if (isset($_POST["Play"]))
{
echo $tracks['demo'];
}else{
echo ' ';
}
?>
There is more going on but I tried to write it down as simple as this to show the logic. All Track url's are hidden and when the page loads there is an empty $audiourl by default loaded in the a href from my audioplayer. By clicking the button play I show the url in the source but not on the site.
Then the latest $audiourl variable changes to this value.

javascript onClick is not not working in php

I am echoing a html form with php which has the following lines:
<a class='btn btn-sm btn-danger pull-right' onClick=return confirm('Delete This account?'); href='".url('deleteuser/'.$order->id)."' >Delete</a>
This correctly goes to the url specified. However, the onClick method is never triggered. Any help is much appreciated.

EDIT: Clarified pure HTML versus echo string.
Put quotes around the onclick attribute value.
i.e. in pure HTML:
onClick="return confirm('Delete This account?');"
So if you are outputting this via echo, you need to escape the respective type of quote characters with a backslash.
echo 'onClick="return confirm(\'Delete This account?\');"';
or
echo "onClick=\"return confirm('Delete This account?');\"";

Upvoted #faintsignal answer because it is correct, your confusion of single quotes is causing, however a much better way to do this is separate the PHP from the HTML:
<?php
foreach($someItem as $someKey => $order){
?>
<a class="btn btn-sm btn-danger pull-right" onClick="return confirm('Delete This account?');" href="<?php echo url('deleteuser/'.$order->id); ?>">Delete</a>
<?php
}
?>
Just providing an alternative, and it's generally considered good practice because you have clear separation of duties and its easier to maintain.
EDIT: provided a super generic example of using foreach, obviously you can mod for your setup but it shows you can separate the function and it will run just fine.

Html with javascript in php seems to be conflicting

The code i want to get into a php statement is
<a href="javascript:void();"
onclick="document.loginfrm.user.value="username";
document.loginfrm.pass.value="password";
document.loginfrm.submit();">login
</a>
So what i would normally do is just surround it with an echo and quotation marks: an then replace any quotation marks in the statement with these --> ('), so that's what i did... and for some reason it seems to misinterpret the sentence severely. Here is the code i enter in php.
echo "<a href='javascript:void();'
onclick='document.loginfrm.user.value='username';
document.loginfrm.pass.value='password';
document.loginfrm.submit();'>". login ."</a>";
And this is how the browser interprets it:
<a href="javascript:void();
" onclick="document.loginfrm.user.value=" username';=""
document.loginfrm.pass.value="password" ;="" document.loginfrm.submit();'="">
login</a>
So yes is there any way around displaying html within php that could get around this problem

Can you try this, added \
echo "<a href=\"javascript:void();\"
onclick=\"document.loginfrm.user.value='username';
document.loginfrm.pass.value=password';
document.loginfrm.submit();\">login </a>";

You need to escape it properly. Try
echo "<a href=\"javascript:void();\"
onclick=\"document.loginfrm.user.value='username';
document.loginfrm.pass.value='password';
document.loginfrm.submit();\">". $login ."</a>";

You're not escaping your quotes. Try:
echo "<a href=\"javascript:void();\"
onclick=\"document.loginfrm.user.value='username';
document.loginfrm.pass.value='password';
document.loginfrm.submit();\">". login ."</a>";
which should produce:
<a href="javascript:void();"
onclick="document.loginfrm.user.value='username';
document.loginfrm.pass.value='password';
document.loginfrm.submit();">login
</a>
As you have it now, you're closing the onclick attribute when you hit the quote at the start of the "username" value, which means the browser is interpreting username as another attribute and it just gets more confused from there...
Edit: sorry, fixed the html, rather than the php code...

You should do something like this..
<a href="javascript:void();"
onclick="document.loginfrm.user.value='username';
document.loginfrm.pass.value='password';
document.loginfrm.submit();">login
</a>
and with php it should be
echo '<a href="javascript:void();"
onclick="document.loginfrm.user.value=\"username\";
document.loginfrm.pass.value=\"password\";
document.loginfrm.submit();">
login
</a>';

Two times same onclick function - only one works

I am desperate on this.
I create a list with an image and some description and other data.
The image and the description should be linked the same way.
The description link(onclick event) work fine:
<?php echo (string)$flat.'<br />'; ?>
But around the image it doesn't:
<a href="#" onclick="show_object('<?php echo $itemId.','.$identifier; ?>');return false;">
<img src="<?php echo (string)$image_url; ?>" class="list_image"></img>
</a>
Why? I do not understand, I tried several other ways, with including the onclick into the image, making a span out of the a.. Nothing works.
If I click on the image, I see in the javascript console that the request get started, but it does not load the page.
I do not understand since the two requests are exact same and immitedly behind another (inside a table)
please help!

I think you are missing some quotes:
<a href="#" onclick="show_object('<?php echo $itemId."','".$identifier; ?>');return false;">
<img src="<?php echo (string)$image_url; ?>" class="list_image"></img>
</a>
In your version, you call show_object('someitemid,someidentifier') but you want to call show_object('someitemid','someidentifier') as you do in your first <a>-tag.

How is that "exactly the same" ?
"show_object('<?php echo $itemId."','".$identifier; ?>'); return false;"
"show_object('<?php echo $itemId.','.$identifier; ?>');return false;"
I suggest you double check the quotes, or copypaste the working one into the other, then come back to us if it's not fixed :)