Description:
------------
---
From manual page: http://www.php.net/function.date-create
---

date_create() is NOT an alias, It is closer to be named a factory.

For the first hand, DateTime::__construct() can't be called, which is obvious.

For another, there is a significant difference between date_create() and "new DateTime()"

We write 
if (!($DateTime = date_create('garbage'))){
//process error
}
but 
try {
  $DateTime = new DateTime('garbage');
}catch(Exception $E){
...
}


Test script:
---------------
$ php -r 'var_dump(date_create("garbage"));'
bool(false)
$ php -r 'var_dump(new DateTime("garbage"));'

Fatal error: Uncaught exception 'Exception' with message 'DateTime::__construct(): Failed to parse time string (garbage) at position 0 (s): The timezone could not be found in the database' in Command line code:1
Stack trace:
#0 Command line code(1): DateTime->__construct('garbage')
#1 {main}
thrown in Command line code on line 1