(no version information, might be only in CVS)
本函數是實驗性的。本函數的行為,內含函數名稱以及其它任何關於本函數的文件可能會在沒有知會的情況下隨 PHP 以後的發佈而改變。使用本函數風險自擔。
Returns the property index for the changed property. This index identifies the property which was modified in data object.
None.
The property index for a changed property.