I am sure there are other ways,
but I have written a small code that will work.
Output:
Name: Jim Chi, Position: Director
Name: Melly Kate Brown, Position: Producer
Name: Kathy Singer, Position: Actor
<?php
$input = "Jim Chi=Director,Melly Kate Brown=Producer,Kathy Singer=Actor,";
$string = rtrim($input, ','); // remove eventual comma at the end
$arr = explode(',', $string); // split the string at each comma
foreach($arr AS $x){
$item = explode('=', $x); // split each at '='
echo 'Name: '.$item[0].', Position: '.$item[1].'<br />';
}
?>