Wordpress Add a function after content - php

Question

I have following code
function source2(){
?> <p>hello world</p> <?php
}
//add beore after content
function wpdev_before_after($content) {
$beforecontent = 'This goes before the content. Isn’t that awesome!';
$aftercontent = source2();
$fullcontent = $beforecontent . $content . $aftercontent;
return $fullcontent;
}
add_filter('the_content', 'wpdev_before_after');
"Hello World" suppose appear after content.
However, it shows before the content instead, even before the $beforecontent.
If I insert plain text rather than calling a function, it works fine.
How can I fix this?
Thanks

Answer 1

Here is the modified version of the output to be displayed as per your requirement. You Need to return the string inorder to concatenate it. Unless the string is returned it will not be displayed.
OUTPUT: First Text/ Center Text /Last Text to be displayed
<?php
function source2(){
$string = 'Last Text to be displayed';
return $string;
}
//add beore after content
function wpdev_before_after($content) {
ob_start();
$beforecontent = 'First Text';
$aftercontent = source2();
$fullcontent = $beforecontent.$content.$aftercontent;
return $fullcontent;
}
add_filter('the_content', 'wpdev_before_after');
$word="/ Center Text /";
echo wpdev_before_after($word);
?>

Answer 2

Hope so you need to start the output buffer and clear the output and print it again. Have a try at this .
function source2(){
?> <p>hello world</p> <?php
}
//add beore after content
function wpdev_before_after($content) {
ob_start();
$beforecontent = 'This goes before the content. Isn’t that awesome!';
$aftercontent = source2();
$fullcontent = $beforecontent . $content . $aftercontent;
$fullcontent = ob_get_clean();
return $fullcontent;
}
add_filter('the_content', 'wpdev_before_after');