PHP | dns_get_mx() Function

The dns_get_mx() function is an inbuilt function in PHP which returns MX records for the specified internet host name. This function is an alias of the getmxrr() function.

Syntax:

bool dns_get_mx( $host, $mxhosts, $weight );

Parameter: This function accepts three parameters as mentioned above and described below:

• $host: It is required parameter. It specifies the host name whose MX records to be found.
• $mxhosts: It is required parameter. An array specifies MX host names found.
• $weight: It is optional parameter. An array filled with weight information gathered.

Return Value: This function returns TRUE if any record(s) found, otherwise returns FALSE.

Note: This function is available for PHP 5.0.0 and newer version.

Below programs illustrate the dns_get_mx() function in PHP:

Program 1:

<?php

$domain = "geeksforgeeks.org";

if(dns_get_mx($domain, $mx_details)) {
    foreach( $mx_details as $key => $value) {
        echo "$key => $value <br>";
    }
}
?>

Output:

0 => alt3.aspmx.l.google.com 
1 => alt4.aspmx.l.google.com 
2 => aspmx.l.google.com 
3 => alt2.aspmx.l.google.com 
4 => alt1.aspmx.l.google.com 

Program 2:

<?php

$domain = "yahoo.com";

if(dns_get_mx($domain, $mx_details)) {
    foreach( $mx_details as $key => $value ) {
        echo "$key => $value <br>";
    }
}
?>

Output:

0 => mta5.am0.yahoodns.net 
1 => mta6.am0.yahoodns.net 
2 => mta7.am0.yahoodns.net 

Reference: https://www.php.net/manual/en/function.dns-get-mx.php