Use html to call/use php function [duplicate] - php

Question

This question already has answers here:
Execute PHP function with onclick
(9 answers)
Closed 7 years ago.
I'm having some trouble getting my HTML and php to work together.
I've made a onClick that should run a PHP function i have in the top of the PHP file. But every time i click it, it says: ReferenceError: deleteSub is not defined. Can someone tell me what I've done wrong?
HTML:
<?php
if(mysql_num_rows($sql_select_delete) > 0){
while($row = mysql_fetch_assoc($sql_select_delete)){
?><div class="abo_box">
<label class="abo_navn" id="<? echo $row["id"]; ?>"><? echo $row['abo_name']; ?></label>
<label class="delete" onclick="deleteSub();">Delete</label>
</div>
<?php
}
}
?>
PHP:
function deleteSub(){
echo "deleted";
}

Answer 1

You can't call directly a PHP code like this
What you can do is to create a javascript function and you need to use Ajax witch will send a request to your re server and here you can call your PHP function
Remember : PHP is server side code and HTML, JS is client side code, the only way to make them work together is using HTTP requests.

Answer 2

you could do something like this. But to use server side information you should use AJAX and http requests. This example is just for changing DOM elements.
<p id="demo" onclick="myFunction()">Click me to change my text color.</p>
<script>
function myFunction() {
document.getElementById("demo").style.color = "red";
}
</script>