--- /dev/null
+<?php
+
+/**
+ * Reads an installed.json file and provides accessors to get what is
+ * installed
+ *
+ * @since 1.27
+ */
+class ComposerInstalled {
+
+ /**
+ * @param string $location
+ */
+ public function __construct( $location ) {
+ $this->contents = json_decode( file_get_contents( $location ), true );
+ }
+
+ /**
+ * Dependencies currently installed according to installed.json
+ *
+ * @return array
+ */
+ public function getInstalledDependencies() {
+ $deps = [];
+ foreach ( $this->contents as $installed ) {
+ $deps[$installed['name']] = [
+ 'version' => ComposerJson::normalizeVersion( $installed['version'] ),
+ 'type' => $installed['type'],
+ 'licenses' => isset( $installed['license'] ) ? $installed['license'] : [],
+ 'authors' => isset( $installed['authors'] ) ? $installed['authors'] : [],
+ 'description' => isset( $installed['description'] ) ? $installed['description'] : '',
+ ];
+ }
+
+ ksort( $deps );
+ return $deps;
+ }
+}