Online PHP editor | output for 4v774

@ 2016-10-09T13:26:47Z

<?php

function checkEmail($email) {
    $email = trim($email);

    if (filter_var($email, FILTER_VALIDATE_EMAIL) === false) {
        var_dump(__LINE__);
        return false;
    }


    list($username, $domain) = explode("@", $email);
    if (getmxrr($domain, $mxHost)) {
        var_dump(__LINE__);
        return true;
    } else {
        var_dump(gethostbyname($domain), gethostbyaddr(gethostbyname($domain)));
        if (stripos(gethostbyaddr(gethostbyname($domain)), $domain) !== false) {
            var_dump(__LINE__);
            return true;
        }
        
        
        var_dump($domain, checkdnsrr($domain, 'MX'));

        if (checkdnsrr($domain, 'MX')) {
            var_dump(__LINE__);
            return true;
        }

        // Is domain valid
        if (filter_var(gethostbyname($domain), FILTER_VALIDATE_IP)) {
            if (fsockopen($domain, 25, $errno, $errstr, 5)) {
                var_dump(__LINE__);
                return true;
            }
        }
    }
    var_dump(__LINE__);
    return false;
}

var_dump(checkEmail('kaidof@yahoo.com'));

getmxrr('yahoo.com', $out);
print_r($out);

$a = checkdnsrr('yahoo.com', 'ANY');
var_dump($a);
var_dump(getmxrr("yahoo.com", $var)); var_dump($var);
var_dump(checkdnsrr("yahoo.com"));

Output for 7.1.0, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.3 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in /in/4v774 on line 17 string(9) "yahoo.com" bool(false) Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in /in/4v774 on line 18 string(9) "yahoo.com" bool(false) int(39) bool(false) Array ( ) bool(false) bool(false) array(0) { } bool(false)
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in /in/4v774 on line 17 string(9) "yahoo.com" bool(false) Warning: gethostbyaddr(): Address is not a valid IPv4 or IPv6 address in /in/4v774 on line 18 string(9) "yahoo.com" bool(false) int(39) bool(false) Array ( ) bool(false) bool(false) array(0) { } bool(false)

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