如何提取' - '之前的每個單詞與php

Question

如何提取-之前的每個單詞。我的意思是，如果我有

word - word word 
or 
word word2 - word word 
or 
word word2 word3 - word word 

我需要每一個字之前-

Answer 1

<?php 
    $line="word word2 word3 - word word"; 
    $words=explode(" ",trim(substr($line,0,strpos($line,"-")))); 
    print_r($words); 
?> 

Demo

一個班輪

print_r(explode(" ",trim(substr($line,0,strpos($line,"-")))));