如何使用php在' - '之前提取每个单词

Question

如何在-之前提取每个单词。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-

之前的每一个字

Answer 1

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

<强> Demo

一个班轮

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