Fix failing tests around positional replacements.

Both named and positional placeholders should be replaced correctly.
Positional arguments with double digit values should also be handled
correctly.

src/Database/Log/QueryLogger.php

@@ -71,9 +71,8 @@ protected function _interpolate($query)
 
         $keys = [];
         $limit = is_int(key($params)) ? 1 : -1;
-        $params = array_reverse($params);
         foreach ($params as $key => $param) {
-            $keys[] = is_string($key) ? "/:$key/" : '/[?]/';
+            $keys[] = is_string($key) ? "/:$key\b/" : '/[?]/';
         }
 
         return preg_replace($keys, $params, $query->query, $limit);

tests/TestCase/Database/Log/QueryLoggerTest.php

@@ -102,6 +102,24 @@ public function testStringInterpolation3()
         $this->assertEquals($expected, (string)$query);
     }
 
+    /**
+     * Tests that named placeholders
+     *
+     * @return void
+     */
+    public function testStringInterpolationNamed()
+    {
+        $logger = $this->getMock('\Cake\Database\Log\QueryLogger', ['_log']);
+        $query = new LoggedQuery;
+        $query->query = 'SELECT a FROM b where a = :p1 AND b = :p11 AND c = :p20 AND d = :p2';
+        $query->params = ['p11' => 'test', 'p1' => 'string', 'p2' => 3, 'p20' => 5];
+
+        $logger->expects($this->once())->method('_log')->with($query);
+        $logger->log($query);
+        $expected = "SELECT a FROM b where a = 'string' AND b = 'test' AND c = 5 AND d = 3";
+        $this->assertEquals($expected, (string)$query);
+    }
+
     /**
      * Tests that the logged query object is passed to the built-in logger using
      * the correct scope