bnetapifunc.php

<?php
// LICENSE : http://www.wtfpl.net/txt/copying/

/**
 * Returns a raw request URI ready to be sent to the battle.net API.
 *
 * @param  string $url
 * @param  array  $parameters
 * @return string
 */
function getRequestURL($url, array $parameters = [])
{
    $final_url  = 'https://eu.api.battle.net/';

    // Apply a rawlurlencode-pass to every chunk in the request URI.
    // This piece will handle any special characters in your request
    // and make sure you won't get any 404's.
    $url = implode('/', array_map(function ($chunk) {
        return rawurlencode($chunk);
    }, explode('/', $url)));

    // Apply rawlurlencode-pass to every value in the parameters.
    // Not that this is needed, but it's consistent with the behaviour
    // of the URL itself.
    foreach ($parameters as $key => $value) {
        $parameters[$key] = rawurlencode($value);
    }
    
    // Apply the parameters (if any)
    if (count($parameters) > 0) {
        $url .= '?' . http_build_query($parameters);
    }

    // Return the final URL. Trim leading trailing slashes and add one forcefully to ensure there is only one / between
    // the Base URL and our request URL.
    return rtrim($final_url, '/') . '/' . ltrim($url, '/');
}


// Fetch a character with a special character in the name... No biggy :)
$url = getRequestURL('/wow/characters/Stormscale/Gínkeltjes', [
    'fields' => 'items',
    'locale' => 'en_US',
    'apikey' => 'API_KEY'
]);

$data = json_decode(file_get_contents($url));

// $url = https://eu.api.battle.net/wow/characters/Stormscale/G%C3%ADnkeltjes?fields=items&locale=en_US&apikey=API_KEY