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checkdnsrrThis simply tells us if a particular DNS record was found, so could be useful to see if an entered hostname was valid within an email check. checkdnsrr -- Check DNS records corresponding to a given Internet host name or IP address $check=checkdnsrr("hostname", "A");
Let us assume a couple of entries, the first being the valid smirkingloon.com, the second being the invalid liamdelahuntyy.com (extra y) Results:$check=checkdnsrr("smirkingloon.com", "A"); Check: $check=checkdnsrr("liamdelahuntyy.com", "A"); Check: Notice the later domain fails and doesn't return a value See also gethostbyaddr, and Ban Access from an IP address with PHP Share this! |