<p class="sougouContent"> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>$space_name = $tmp_user ? $tmp_user : ($username ? $username : $pd_username);</pre><div class="contentsignin">登入後複製</div></div><div class="contentsignin">登入後複製</div></div> </p> <br /> <h2>回复讨论(解决方案)</h2> <p class="sougouAnswer"> 看下php的三元运算符 </p> <p class="sougouAnswer"> <div class="code" style="position:relative; padding:0px; margin:0px;"><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>$space_name = $tmp_user ? $tmp_user : ($username ? $username : $pd_username);</pre><div class="contentsignin">登入後複製</div></div><div class="contentsignin">登入後複製</div></div> <br> 先执行括号里面的三元字符，然后再执行外面的，很简单， <br> 三元字符就是if语句的简写 </p>
