[PHP] No is_date() function?

[Ken Tozier]

Hi

I wrote a serialization function to turn arbitrary PHP variables into  
Macintosh plist compatible XML but see that there is no "is_date"  
tester as there is for bool, object, array etc. Is there a relatively  
simple (and robust) way to detect if a variable is a date? For example:

$person = array('name'=>'bob', 'sex'=>'male', 'date_of_birth'=>  
$someDateHere);

Thanks for any help

Ken

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