我的数组以什么方式索引'非法字符串偏移'？

Question

When "future-proofing" code by testing it on PHP 5.4, I get a warning I don't understand.

function __clone() {
  $this->changed = TRUE;
  foreach ($this->conditions as $key => $condition) {
    if (
    $condition['field']
    instanceOf QueryConditionInterface) {
      $this->conditions[$key]['field'] = clone($condition['field']);
    }
  }
}

I broke out $condition['field'] into its own row to reduce the amount of code to focus on. About that specific line, PHP has this to say

Warning: Illegal string offset 'field' in DatabaseCondition->__clone()

And I just can't see how 'field', is an illegal string offset. I'm guessing that I'm just missing something obvious, but if the community can't find a problem, I'll file a bug report.

I interpret the warning as "Under no circumstances is 'field' a valid key". This error would have made sense if I had tried to us for example an array as a key.

Answer 1

The warning looks like its saying that $condition is a string. Without any knowledge of the code I don't whether that makes any sense.