是否在echo语句内阻塞? [英] if block inside echo statement?

问题描述

我怀疑这是不允许的，因为我收到解析错误:语法错误，意外的T_IF输入..."错误.但是我找不到实现目标的方法.这是我的代码:

I suspect it's not allowable because I am getting "Parse error: syntax error, unexpected T_IF in..." error. But I couldn't find a way to accomplish my goal. Here's my code:

<?php 

  $countries = $myaddress->get_countries();

  foreach($countries as $value){
    echo '<option value="'.$value.'"'.if($value=='United States') echo 'selected="selected"';.'>'.$value.'</option>';
  }
  ?>

它的作用是在select元素中显示国家列表，并将United States设置为默认值.我不难过...

What it does is it displays a list of countries in a select element and sets United States as the default. I doesn't work sadly...

推荐答案

您将要使用 the 一个三元运算符，用作简化的IF/Else语句:

You will want to use the a ternary operator which acts as a shortened IF/Else statement:

echo '<option value="'.$value.'" '.(($value=='United States')?'selected="selected"':"").'>'.$value.'</option>';

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