what does implode() function is used for?

Answer 1

the implode function is used to convert array values into single string.
$arr = array("apple","orange","banana");
$string = implode(":",$arr);
echo $string;

output:
>> apple:orange:banana

Answer 2

And explode means the exact opposite to the implode , what explode does is it explode some characters with user defined any kind of variables such as ' ' , or any other characters .
(Sorry it's out of topic )😃