From c6de5dfec5e3acfedeb0a9aa3b916ce8ef9da731 Mon Sep 17 00:00:00 2001
From: Boone Gorges <boonebgorges@git.wordpress.org>
Date: Tue, 28 Oct 2014 14:56:33 +0000
Subject: [PATCH] Allow 'slug' param of `get_terms()` to accept an array.

Props jfarthing84, dlh.
Fixes #23636.

git-svn-id: https://develop.svn.wordpress.org/trunk@30042 602fd350-edb4-49c9-b593-d223f7449a82
---
 src/wp-includes/taxonomy.php          | 11 +++++++---
 tests/phpunit/tests/term/getTerms.php | 30 +++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/src/wp-includes/taxonomy.php b/src/wp-includes/taxonomy.php
index b8261dfeec..fffc05f986 100644
--- a/src/wp-includes/taxonomy.php
+++ b/src/wp-includes/taxonomy.php
@@ -1594,7 +1594,7 @@ function get_term_to_edit( $id, $taxonomy ) {
  *     @type string       $fields            Term fields to query for. Accepts 'all' (returns an array of
  *                                           term objects), 'ids' or 'names' (returns an array of integers
  *                                           or strings, respectively. Default 'all'.
- *     @type string       $slug              Slug to return term(s) for. Default empty.
+ *     @type string|array $slug              Optional. Slug(s) to return term(s) for. Default empty.
  *     @type bool         $hierarchical      Whether to include terms that have non-empty descendants (even
  *                                           if $hide_empty is set to true). Default true.
  *     @type string       $search            Search criteria to match terms. Will be SQL-formatted with
@@ -1804,8 +1804,13 @@ function get_terms( $taxonomies, $args = '' ) {
 	}
 
 	if ( ! empty( $args['slug'] ) ) {
-		$slug = sanitize_title( $args['slug'] );
-		$where .= " AND t.slug = '$slug'";
+		if ( is_array( $args['slug'] ) ) {
+			$slug = array_map( 'sanitize_title', $args['slug'] );
+			$where .= " AND t.slug IN ('" . implode( "', '", $slug ) . "')";
+		} else {
+			$slug = sanitize_title( $args['slug'] );
+			$where .= " AND t.slug = '$slug'";
+		}
 	}
 
 	if ( ! empty( $args['name__like'] ) ) {
diff --git a/tests/phpunit/tests/term/getTerms.php b/tests/phpunit/tests/term/getTerms.php
index 2be4e8cb28..47780ebf2b 100644
--- a/tests/phpunit/tests/term/getTerms.php
+++ b/tests/phpunit/tests/term/getTerms.php
@@ -352,6 +352,36 @@ class Tests_Term_getTerms extends WP_UnitTestCase {
 		add_filter( 'wp_update_term_parent', 'wp_check_term_hierarchy_for_loops', 10, 3 );
 	}
 
+	public function test_get_terms_by_slug() {
+		$t1 = $this->factory->tag->create( array( 'slug' => 'foo' ) );
+		$t2 = $this->factory->tag->create( array( 'slug' => 'bar' ) );
+
+		$found = get_terms( 'post_tag', array(
+			'hide_empty' => false,
+			'fields' => 'ids',
+			'slug' => 'foo',
+		) );
+
+		$this->assertEquals( array( $t1 ), $found );
+	}
+
+	/**
+	 * @ticket 23636
+	 */
+	public function test_get_terms_by_multiple_slugs() {
+		$t1 = $this->factory->tag->create( array( 'slug' => 'foo' ) );
+		$t2 = $this->factory->tag->create( array( 'slug' => 'bar' ) );
+		$t3 = $this->factory->tag->create( array( 'slug' => 'barry' ) );
+
+		$found = get_terms( 'post_tag', array(
+			'hide_empty' => false,
+			'fields' => 'ids',
+			'slug' => array( 'foo', 'barry' )
+		) );
+
+		$this->assertEquals( array( $t1, $t3 ), $found );
+	}
+
 	public function test_get_terms_hierarchical_tax_hide_empty_false_fields_ids() {
 		// Set up a clean taxonomy.
 		$tax = 'hierarchical_fields';