php - 如何检查 phing 构建 xml 中的变量是否为空？

Question

我提到了 the documentation并尝试了这个 -

<php function="empty" returnProperty="productionSameAsExpectedBranch">
    <param value="${productionDeviationFromExpectedBranch}"/>
</php>

但它给出错误 -

[php] Calling PHP function: empty() [PHP Error] call_user_func_array() expects parameter 1 to be a valid callback, function 'empty' not found or invalid function name [line 125 of /usr/share/pear/phing/tasks/system/PhpEvalTask.php]

Answer 1

我正在使用这样的构造:

<if>
  <or>
    <not><isset property="productionSameAsExpectedBranch" /></not>
    <and>
      <isset property="productionSameAsExpectedBranch" />
      <equals arg1="${productionSameAsExpectedBranch}" arg2="" />
    </and>
  </or>
  <then>
    <!-- it is not set or empty -->
    <!--property name="productionSameAsExpectedBranch" value="something" override="true" /-->
  </then>
<else />
</if>