first commit

index.php

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+<?php
+
+// aureum est silentium

polylang-body-class.php

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+<?php
+/*
+Plugin Name: Polylang Body Class
+Plugin URI: https://github.com/diggy/polylang-body-class
+Version: 1.0.0
+Author: Peter J. Herrel
+Author uri: https://github.com/diggy
+Description: Adds prefixed and sanitized locale to body classes. Background: https://git.io/vyIh7
+License: GPL-2.0+
+License URI: https://www.gnu.org/licenses/gpl-2.0.txt
+*/
+
+# prevent direct access
+if ( ! defined( 'ABSPATH' ) ) {
+    exit;
+}
+
+/**
+ * Adds prefixed and sanitized locale to body classes
+ *
+ * @param  array $classes An array of body classes.
+ * @return array
+ */
+add_filter( 'body_class', 'pll_plugin_body_class' );
+function pll_plugin_body_class( $classes )
+{
+    if ( function_exists( 'PLL' ) && $language = PLL()->model->get_language( get_locale() ) )
+    {
+        $classes[] = 'pll-' . str_replace( '_', '-', sanitize_title_with_dashes( $language->get_locale( 'raw' ) ) );
+    }
+
+    return $classes;
+}