PHP数组：检查它是'key => value'还是仅仅是'value'

Question

我有两个数组：

...
  File "/Users/Ryan/projects18/scoutingEnv/lib/python2.7/site-packages/openpyxl/reader/excel.py", line 175, in load_workbook
    archive = _validate_archive(filename)
  File "/Users/Ryan/projects18/scoutingEnv/lib/python2.7/site-packages/openpyxl/reader/excel.py", line 125, in _validate_archive
    archive = ZipFile(f, 'r', ZIP_DEFLATED)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/zipfile.py", line 770, in __init__
    self._RealGetContents()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/zipfile.py", line 811, in _RealGetContents
    raise BadZipfile, "File is not a zip file"
zipfile.BadZipfile: File is not a zip file

如何使用$one = ['apple']; $two = ['fruit' => 'apple']; 检查php仅具有一个值（默认值为$one），而另一个具有实际的key 0（{{1} }）？

谢谢！