PHP equivalent to jQuery html() or text() - php

Question

Im trying to print the result of a php function to specific html id or class
the php function is called by a button input
jQuery code:
function myfunction() {
$answer = 'random text <b>' + $radomvar +'more random';
$('#resultline').html($answer);
}
is there an equivalent for the
$('#resultline').html($answer);
in php?

Answer 1

What you're asking doesn't make sense. You can can embed PHP code alongside HTML code and it is processed by the server before the HTTP response is sent back to the client.
Therefore, why not do something like:
<span id="resultline"><?php echo myFunction(); ?></span>
Where myFunction is a PHP function that returns the string you want to embed?

Answer 2

You can write your javascript code in .php file and then use your JavaScript function like this:
function myfunction() {
$answer = 'random text <b>' + '<?php echo myfunc($radomvar); ?>' +'more random';
$('#resultline').html($answer);
}

Answer 3

No there isn't. PHP is server side so after the request is done it can't change the webpage anymore. If you want to do that the only option is an AJAX call with for example JQuery as framework.

Answer 4

You can't do proper DOM Manipulation with PHP. For the purpose of your question, you'd have to use jQuery's ajax function to request the variable value from the backend, and fill the container when you retrieve it.
js script:
jQuery.ajax({
url: 'myfunction.php',
data: {varname: randomvar},
type: 'POST'
}).done(function(response) {
$('#resultline').html(response);
});
myfunction.php
<?php
function myfunction($radomvar) {
$answer = 'random text <b>'. $radomvar .'more random';
return $answer;
}
echo myfunction($_POST['varname']);
Please note that you don't need PHP to interpolate variables in a string. That function doesn't need PHP whatsoever to run. If the only purpose of PHP here is to get $radomvar value, and you're positively sure you want to have PHP in your frontend, then it would suffice to do something like
<script>
function myfunction(radomvar) {
var answer = 'random text <b>' + radomvar +'more random';
$('#resultline').html(answer);
}
var randomvalue='<?php echo $radomvar; ?>';
myfunction(randomvalue);
</script>

Answer 5

Well their is no function equal to that in php, however you can easily achive the same effect rather easy by writing few more lines of code.
<div id="resultline"><?php echo $answer; ?></div>
instead you have to place php echo code where you want printed out on the html page, otherweise you have to use ajax or something else than php.