Closes #701: Blank tags not returned by string_to_tag_array

git-svn-id: https://code.elgg.org/elgg/trunk@2597 36083f99-b078-4883-b0ff-0f9b5a30f544

2 files changed, 17 insertions, 2 deletions

diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 356ecd003..5ee17c486 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -1861,6 +1861,20 @@
 	}
 	
 	/**
+	 * Function to be used in array_filter which returns true if $string is not null.
+	 *
+	 * @param string $string
+	 * @return bool
+	 */
+	function is_not_null($string) 
+	{
+		if (($string==='') || ($string===false) || ($string===null)) 
+			return false;
+
+		return true;
+	}
+	
+	/**
 	 * Get the full URL of the current page.
 	 *
 	 * @return string The URL
diff --git a/engine/lib/metadata.php b/engine/lib/metadata.php
index 481fdda16..97d81e973 100644
--- a/engine/lib/metadata.php
+++ b/engine/lib/metadata.php
@@ -753,8 +753,9 @@
 		

 		if (is_string($string)) {

 			$ar = explode(",",$string);
-			$ar = array_map('trim', $ar);
-			$ar = array_map('strtolower', $ar);

+			$ar = array_map('trim', $ar); // trim blank spaces
+			$ar = array_map('strtolower', $ar); // make lower case
+			$ar = array_filter($ar, 'is_not_null'); // Remove null values

 			return $ar;

 		}

 		return false;