Fix #70628: Clearing bindings on an SQLite3 statement doesn't work

Obiously, it isn't sufficient to call sqlite3_clear_bindings() alone, but
also the bound_params of the php_sqlite3_stmt have to be cleared.

ext/sqlite3/sqlite3.c

@@ -1376,6 +1376,12 @@ PHP_METHOD(sqlite3stmt, clear)
 		RETURN_FALSE;
 	}
 
+	if (stmt_obj->bound_params) {
+		zend_hash_destroy(stmt_obj->bound_params);
+		FREE_HASHTABLE(stmt_obj->bound_params);
+		stmt_obj->bound_params = NULL;
+	}
+
 	RETURN_TRUE;
 }
 /* }}} */

ext/sqlite3/tests/bug70628.phpt

@@ -0,0 +1,55 @@
+--TEST--
+Bug #70628 (Clearing bindings on an SQLite3 statement doesn't work)
+--SKIPIF--
+<?php
+if (!extension_loaded('sqlite3')) die('skip'); ?>
+--FILE--
+<?php
+$db = new SQLite3(':memory:');
+
+$db->exec("CREATE TABLE Dogs (Id INTEGER PRIMARY KEY, Breed TEXT, Name TEXT, Age INTEGER)");
+
+$sth = $db->prepare("INSERT INTO Dogs (Breed, Name, Age)  VALUES (:breed,:name,:age)");
+
+$sth->bindValue(':breed', 'canis', SQLITE3_TEXT);
+$sth->bindValue(':name', 'jack', SQLITE3_TEXT);
+$sth->bindValue(':age', 7, SQLITE3_INTEGER);
+$sth->execute();
+
+$sth->clear();
+$sth->reset();
+
+$sth->bindValue(':breed', 'russel', SQLITE3_TEXT);
+$sth->bindValue(':age', 3, SQLITE3_INTEGER);
+$sth->execute();
+
+$res = $db->query('SELECT * FROM Dogs');
+while (($row = $res->fetchArray(SQLITE3_ASSOC))) {
+    var_dump($row);
+}
+$res->finalize();
+
+$sth->close();
+$db->close();
+?>
+--EXPECT--
+array(4) {
+  ["Id"]=>
+  int(1)
+  ["Breed"]=>
+  string(5) "canis"
+  ["Name"]=>
+  string(4) "jack"
+  ["Age"]=>
+  int(7)
+}
+array(4) {
+  ["Id"]=>
+  int(2)
+  ["Breed"]=>
+  string(6) "russel"
+  ["Name"]=>
+  NULL
+  ["Age"]=>
+  int(3)
+}