Adding getApiVersion function and ensuring getAPIBaseVersion doesn't …

…need to be updated for new versions

acf-to-wp-api.php

@@ -37,7 +37,7 @@ function __construct() {
         $this->plugin->url = WP_PLUGIN_URL . '/' . str_replace(basename( __FILE__), "", plugin_basename(__FILE__));
 		$this->plugin->version = '1.3.2';
 
-		$this->apiVersion = (REST_API_VERSION) ?: get_option( 'rest_api_plugin_version', get_option( 'json_api_plugin_version', null ) );
+		$this->apiVersion = $this->_getAPIVersion();
 
 		// Version One
 		if($this->_isAPIVersionOne()) {
@@ -106,6 +106,26 @@ private function _versionTwoSetup() {
 		add_action( 'rest_api_init', array( $this, 'addACFOptionRouteV2') );
 	}
 
+	/**
+	 * Returns the WP REST API version, assumes version 2
+	 * if can't find any other version
+	 * 
+	 * @return string The version number, set by WP REST API
+	 * 
+	 * @since 1.3.2
+	 */
+	private function _getAPIVersion() {
+		$version = 2;
+
+		if ( defined( REST_API_VERSION ) ) {
+			$version = REST_API_VERSION;
+		} else {
+			$version = get_option( 'rest_api_plugin_version', get_option( 'json_api_plugin_version', null ) );
+		}
+
+		return $version;
+	}
+
 	/**
 	 * Gets the version number of the WP REST API
 	 *
@@ -122,14 +142,10 @@ private function _getAPIBaseVersion() {
 			return false;
 		}
 
-		$baseNumber = substr( $version, 0, 1 );
-
-		if( $baseNumber === '1' ) {
-			return 1;
-		}
+		$baseNumber = (int) substr( $version, 0, 1 );
 
-		if( $baseNumber === '2' ) {
-			return 2;
+		if( $baseNumber > 0 ) {
+			return $baseNumber;
 		}
 
 		return false;