Checkdnsrr function to check dns records of a domain name

Check DNS records safely

checkdnsrr() can test whether a DNS record exists, while getmxrr() retrieves mail-exchanger hosts. DNS results are useful validation signals but do not prove that an email address or remote service is usable. If the domain comes from a request, validate and normalize it before making the DNS lookup.

<?php
$domain = 'example.com';

if (checkdnsrr($domain, 'MX')) {
    $hosts = [];
    $weights = [];
    getmxrr($domain, $hosts, $weights);
    print_r($hosts);
} else {
    echo 'No MX record found.';
}
?>

We can check our DNS record to verify the existence of a domain name or not. We can see if plus2net.com is there in DNS record by using checkdnsrr function. This function returns True if available and returns False if not available.

The type can be A, MX, NS, PTR,SOA, AAAA, CNAME, SRV,A6 NAPTR, TXT or ANY

This function may not work properly in Windows platform ( Older than PHP 5.3 ).

Here is the simple code to check DNS records.

$domain="plus2net.com";
if(!checkdnsrr($domain,'MX')) {
echo "Not there ";
}else {
echo " It is there ";
}

MX record : getmxrr()

We can get details of mail exchanger record ( MX record ) by using getmxrr() function.

getmxrr(hostname, array $result, array $weight)

If returns True of False based on the information found. Output is stored in $result as array.
It takes optional parameter weight

Here is an example.

$domain='example.com';
if(getmxrr($domain,$mx_details)){
foreach($mx_details as $key=>$value){
echo "$key => $value <br>";
}
}

Example 1: Checking MX Records for a Domain

<?php
$domain = "plus2net.com";
if (!checkdnsrr($domain, 'MX')) {
    echo "Domain does not exist.";
} else {
    echo "Domain exists.";
}
?>

IP address and Geo Location of visitor Storing visitor details in MySQL table

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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Checkdnssrr function in PHP

Check DNS records safely

MX record : getmxrr()

Example 1: Checking MX Records for a Domain

Subhendu Mohapatra