Consider the following code sample:
$m_oDate = new DateTime('2013-06-12 15:54:25'); print_r($m_oDate); echo $m_oDate->date;
Since PHP 5.3, this produces (something like) the following output:
DateTime Object ( [date] => 2013-06-12 15:54:25 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) 2013-06-12 15:54:25
However the following code:
$m_oDate = new DateTime('2013-06-12 15:54:25'); echo $m_oDate->date;
...simply emits an error:
Notice: Undefined property: DateTime::$date in ...
print_r() "add" these properties to the object? Note that they are not defined as part of the
DateTime class on the manual page.
There is some magic occurring but it's pretty simple.
The class DateTime doesn't have a public variable 'date' that you're meant to access. However, as a side effect of how PHP works, there is a variable created when you call print_r or var_dump on that class.
After that magic happens 'date' is available, but it shouldn't be. You should just use the getTimestamp function to make your code work reliably.