# Useful PHP Codes ### Increment a Date by Month, Day or Year **Increment by month** - 1. ``` $time = strtotime("2014-12-11");

$d = date("Y-m-d", strtotime("+1 month", $time)); ``` **Increment by day** 1. ``` $time = strtotime("2014-12-11");

$d = date("Y-m-d", strtotime("+1 day", $time)); ``` **Increment by year** 1. ``` $time = strtotime("2014-12-11");

$d = date("Y-m-d", strtotime("+1 year", $time)); ``` ### Verify Email Accounts ```
function verifyEmail($toemail, $fromemail, $getdetails = false)

{

   $email_arr = explode("@", $toemail);

   $domain = array_slice($email_arr, -1);

   $domain = $domain[0];

   // Trim [ and ] from beginning and end of domain string, respectively

   $domain = ltrim($domain, "[");

   $domain = rtrim($domain, "]");

   if ("IPv6:" == substr($domain, 0, strlen("IPv6:"))) {

   $domain = substr($domain, strlen("IPv6") + 1);

   }

   $mxhosts = array();

   if (filter_var($domain, FILTER_VALIDATE_IP))

   $mx_ip = $domain;

   else

   getmxrr($domain, $mxhosts, $mxweight);

   $details = '';

   if (!empty($mxhosts))

   $mx_ip = $mxhosts[array_search(min($mxweight), $mxhosts)];

   else {

   if (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {

   $record_a = dns_get_record($domain, DNS_A);

   } elseif (filter_var($domain, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {

   $record_a = dns_get_record($domain, DNS_AAAA);

   }

   if (!empty($record_a))

   $mx_ip = $record_a[0]['ip'];

   else {

   $result = "invalid";

   $details .= "No suitable MX records found.";

   return ((true == $getdetails) ? array(

   $result,

   $details

   ) : $result);

   }

   }



   $connect = @fsockopen($mx_ip, 25);

   if ($connect) {

   if (preg_match("/^220/i", $out = fgets($connect, 1024))) {

   fputs($connect, "HELO $mx_ip\r\n");

   $out = fgets($connect, 1024);

   $details .= $out . "\n";



   fputs($connect, "MAIL FROM: <$fromemail>\r\n");

   $from = fgets($connect, 1024);

   $details .= $from . "\n";

   fputs($connect, "RCPT TO: <$toemail>\r\n");

   $to = fgets($connect, 1024);

   $details .= $to . "\n";

   fputs($connect, "QUIT");

   fclose($connect);

   if (!preg_match("/^250/i", $from) || !preg_match("/^250/i", $to)) {

   $result = "invalid";

   } else {

   $result = "valid";

   }

   }

   } else {

   $result = "invalid";

   $details .= "Could not connect to server";

   }

   if ($getdetails) {

   return array(

   $result,

   $details

   );

   } else {

   return $result;

   }

}

//Sample usage:

print_r(verifyEmail('', '')); ``` ### Calculate Coordinate Distances ``` function getDistance( $latitude1, $longitude1, $latitude2, $longitude2 ) {

   $earth_radius = 6371;

   $dLat = deg2rad( $latitude2 - $latitude1 );

   $dLon = deg2rad( $longitude2 - $longitude1 );

   $a = sin($dLat/2) * sin($dLat/2) + cos(deg2rad($latitude1)) * cos(deg2rad($latitude2)) * sin($dLon/2) * sin($dLon/2);

   $c = 2 * asin(sqrt($a));

   $d = $earth_radius * $c;

   return $d;

   }

   $distance = getDistance( 56.130366, -106.34677099999, 57.223366, -106.34675644699 );

   if( $distance < 100 ) {

   echo "Within 100 kilometer radius";

   } else {

   echo "Outside 100 kilometer radius";

   }

} ```