php string struggle

Question

how to change "hello world" become "hellloowrld"

"iron man and mooglie" become "iirooonnmmaadgle"

the idea is to sort each character by each time it come first

help me!

Answer 1

https://code.sololearn.com/w31XEwKrs9Pf/?ref=app

Answer 2

There might be better solutions
https://code.sololearn.com/wu8H3BRiOoy5/?ref=app

Answer 3

Thank you so much guys😄😄😄

Answer 4

What is $newtext . Mean?? Mystic Life

Answer 5

I guess you are asking about .=
It is making code shorter and simpler
$a .= $b; means
$a = $a.$b;

Check this page for details
https://www.php.net/manual/en/language.operators.assignment.php

Answer 6

Ok thank you 😃