PHP - checkdnsrr - differences between "A, MX, NS, SOA, PTR, CNAME, AAAA, A6, SRV, NAPTR, TXT or ANY"

Hi E's, I try to use the function checkdnsrr, but I don't know the differences between the $string Type of this function.
For try the function I used the code in snippet code, and I change the type for try, but the most of the times the return is true or false.

Can you explain the the differences (if some expert have a simple script where I can see the real differences, I apreciate).

Regards, JC
$ver = checkdnsrr("example.com", MX);
if ($ver == true){
	echo the domain exists;
	}

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LVL 3
Pedro ChagasWebmasterAsked:
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IanThCommented:
A = ip address
mx = mail server
ns = nameserver
soa = Start of Authority
http://support.microsoft.com/kb/163971
ptr = in arpa , reverse dns
cname = alias
aaaa = ip v6
a6 = ip v6
svr = backup mx

so your script will equal true if for instance example.com has an mx record set up
see http://quanta.sourceforge.net/docs/php/function.checkdnsrr.html 
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