remove part of string after delimiter in php

I have seen other
I have a string " cccc cccc - fff"

I need to return "cccc cccc" I don’t need to delimiter too
I tried to echo the result of
substr($mystring , 0, strpos($mystring , "-"));
but it return nothing
I also tried

list($result, $trash) =split('-', $mystring);

 echo $result;
 echo $trash;

resulted returned the main string and trash resulted nothing
Update:
i’m using wordpress and for some reason it is not working.
I need to trim my title, i’m using get_the_title() and i’m trying to trim it

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