#29 - Add JSON encoder

Author: technicalguru

src/TgUtils/JSON.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace TgUtils;
+
+class JSON {
+
+	/**
+	 * Encodes a value after deep inspection for any values to be transformed.
+	 * These transformations are made:
+	 * \TgUtils\Date            - transformed to ISO8601 string
+	 * \TgUtils\SelfJsonEncoder - transformed to according structure (using json_decode($mixed->json_encode))
+	 * any other object         - deep inspected with get_object_vars() and transformed to \stdClass
+	 * array                    - deep inspected and transformed to arrays respecting keys
+	 * any other value          - no transformation
+	 *
+	 * @param mixed $mixed - the value to be transformed
+	 * @param int   $flags - see PHP json_encode() documentation
+	 * @param int   $depth - see PHP json_encode() documentation
+	 * @return string - JSON representation of $mixed
+	 */
+	public static function encode($mixed, int $flags=0, int $depth=512) {
+		return json_encode(self::transformForEncode($mixed), $flags, $depth);
+	}
+
+	/**
+	 * Transforms a value recursively in order to detect dates and self-encoders.
+	 * These transformations are made:
+	 * \TgUtils\Date            - transformed to ISO8601 string
+	 * \TgUtils\SelfJsonEncoder - transformed to according structure (using json_decode($mixed->json_encode))
+	 * any other object         - deep inspected with get_object_vars() and transformed to \stdClass
+	 * array                    - deep inspected and transformed to arrays respecting keys
+	 * any other value          - no transformation
+	 *
+	 * @param  mixed $mixed - the value to be transformed
+	 * @return mixed - the transformed value
+	 */
+	public static function transformForEncode($mixed) {
+		if (is_object($mixed)) {
+			if (is_a($mixed, 'TgUtils\\Date')) {
+				$mixed = $mixed->toISO8601(TRUE);
+			} else if (is_a($mixed, 'TgUtils\\SelfJsonEncoder')) {
+				$mixed = json_decode($mixed->json_encode());
+			} else {
+				$rc = new \stdClass;
+				foreach (get_object_vars($mixed) AS $name => $value) {
+					$rc->$name = self::transformForEncode($value);
+				}
+				$mixed = $rc;
+			}
+		} else if (is_array($mixed)) {
+			$rc = array();
+			foreach ($mixed AS $key => $value) {
+				$rc[$key] = self::transformForEncode($value);
+			}
+			$mixed = $rc;
+		}
+		return $mixed;
+	}
+
+}