Ticket #35864: 35864.0.diff

src/wp-includes/formatting.php

@@ -374 +374 @@
  */
 function _wptexturize_pushpop_element( $text, &$stack, $disabled_elements ) {
         // Is it an opening tag or closing tag?
-        if ( '/' !== $text[1] ) {
+        if ( isset( $text[1] ) && '/' !== $text[1] ) {
                 $opening_tag = true;
                 $name_offset = 1;
         } elseif ( 0 == count( $stack ) ) {

tests/phpunit/tests/formatting/WPTexturize.php

@@ -2073 +2073 @@
                 return $this->assertLessThan( 200, $result );
         }
 
+        /**
+         * Ensure that a trailing less-than symbol doesn't cause a PHP warning.
+         *
+         * @ticket 35864
+         */
+        function test_trailing_less_than() {
+                $this->assertEquals( 'F&#8211;oo<', wptexturize( 'F--oo<', true ) );
+        }
+
         function data_whole_posts() {
                 require_once( DIR_TESTDATA . '/formatting/whole-posts.php' );
                 return data_whole_posts();