php调用exec时设置超时 <span class="kwd">exec</span><span class="pun">(</span><span class="str">"timeout [seconds] [command]"</span><span class="pun">);</span> 1 <span class="kwd">exec</span><span class="pun">(</span><span class="str">"timeout [seconds] [command]"</span><span class="pun">);</span> 参考：https://stackoverflow.com/questions/9419122/exec-with-timeout