diff --git a/include/text.php b/include/text.php
index 1b06819570..216e87ed8c 100644
--- a/include/text.php
+++ b/include/text.php
@@ -64,25 +64,6 @@ function perms2str($p) {
 	return $ret;
 }
 
-/**
- *  for html,xml parsing - let's say you've got
- *  an attribute foobar="class1 class2 class3"
- *  and you want to find out if it contains 'class3'.
- *  you can't use a normal sub string search because you
- *  might match 'notclass3' and a regex to do the job is
- *  possible but a bit complicated.
- *  pass the attribute string as $attr and the attribute you
- *  are looking for as $s - returns true if found, otherwise false
- *
- * @param string $attr attribute value
- * @param string $s string to search
- * @return boolean True if found, False otherwise
- */
-function attribute_contains($attr, $s) {
-	$a = explode(' ', $attr);
-	return (count($a) && in_array($s,$a));
-}
-
 /**
  * Compare activity uri. Knows about activity namespace.
  *
diff --git a/tests/include/TextTest.php b/tests/include/TextTest.php
index 5676da8f62..1137c0415d 100644
--- a/tests/include/TextTest.php
+++ b/tests/include/TextTest.php
@@ -13,44 +13,6 @@ use PHPUnit\Framework\TestCase;
  */
 class TextTest extends TestCase
 {
-	/**
-	 * test attribute contains
-	 */
-	public function testAttributeContains1()
-	{
-		$testAttr="class1 notclass2 class3";
-		$this->assertTrue(attribute_contains($testAttr, "class3"));
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test attribute contains
-	 */
-	public function testAttributeContains2()
-	{
-		$testAttr="class1 not-class2 class3";
-		$this->assertTrue(attribute_contains($testAttr, "class3"));
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test with empty input
-	 */
-	public function testAttributeContainsEmpty()
-	{
-		$testAttr="";
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
-	/**
-	 * test input with special chars
-	 */
-	public function testAttributeContainsSpecialChars()
-	{
-		$testAttr="--... %\$ä() /(=?}";
-		$this->assertFalse(attribute_contains($testAttr, "class2"));
-	}
-
 	/**
 	 * test expand_acl, perfect input
 	 */