Get public IP address (or wan IP address) with php function

publicip.php

<?php

function getPublicIP() {
  // create & initialize a curl session
  $curl = curl_init();

  // set our url with curl_setopt()
  curl_setopt($curl, CURLOPT_URL, "http://httpbin.org/ip");

  // return the transfer as a string, also with setopt()
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

  // curl_exec() executes the started curl session
  // $output contains the output string
  $output = curl_exec($curl);

  // close curl resource to free up system resources
  // (deletes the variable made by curl_init)
  curl_close($curl);

  $ip = json_decode($output, true);

  return $ip['origin'];
}

?>

Greate, it work for us.
nice and thankl so much

what will happen when http://httpbin.org/ip is go down or removed ?

what will happen when http://httpbin.org/ip is go down or removed ?

dead of page

For a simpler I use this:
function get_public_ip() { return json_decode(file_get_contents('http://httpbin.org/ip'), true)['origin']; }