On my server I am running a few PHP files that read my Firebase Realtime Database. According to Firebase's documents I need to set up custom token to get my Firebase PHP Client running. The Firebase document says I need to return this;
return JWT::encode($payload, $private_key, "RS256");
firebase/php-jwt library uses composer. Composer is a dependency manager for PHP similar to Maven in java if you come from android development background. You would need to know how to import classes in php using require/include functions of php. You would need some experience with php to use composer.
In order to use firebase/php-jwt library without composer you could use the following sample code: (I downloaded the library inside 'jwt' folder)
<?php require_once 'jwt/src/BeforeValidException.php'; require_once 'jwt/src/ExpiredException.php'; require_once 'jwt/src/SignatureInvalidException.php'; require_once 'jwt/src/JWT.php'; use \Firebase\JWT\JWT; $key = "example_key"; $token = array( "iss" => "http://example.org", "aud" => "http://example.com", "iat" => 1356999524, "nbf" => 1357000000 ); /** * IMPORTANT: * You must specify supported algorithms for your application. See * https://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-40 * for a list of spec-compliant algorithms. */ $jwt = JWT::encode($token, $key); $decoded = JWT::decode($jwt, $key, array('HS256')); print_r($decoded); /* NOTE: This will now be an object instead of an associative array. To get an associative array, you will need to cast it as such: */ $decoded_array = (array) $decoded; /** * You can add a leeway to account for when there is a clock skew times between * the signing and verifying servers. It is recommended that this leeway should * not be bigger than a few minutes. * * Source: http://self-issued.info/docs/draft-ietf-oauth-json-web-token.html#nbfDef */ JWT::$leeway = 60; // $leeway in seconds $decoded = JWT::decode($jwt, $key, array('HS256')); ?>