diff --git a/ext/spl/php_spl.c b/ext/spl/php_spl.c
index f796b936dae..6de7a6d6635 100644
--- a/ext/spl/php_spl.c
+++ b/ext/spl/php_spl.c
@@ -66,7 +66,7 @@ PHP_FUNCTION(class_parents)
 {
 	zval *obj;
 	zend_class_entry *parent_class, *ce;
-	bool autoload = 1;
+	bool autoload = true;
 
 	/* We do not use Z_PARAM_OBJ_OR_STR here to be able to exclude int, float, and bool which are bogus class names */
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "z|b", &obj, &autoload) == FAILURE) {
@@ -99,7 +99,7 @@ PHP_FUNCTION(class_parents)
 PHP_FUNCTION(class_implements)
 {
 	zval *obj;
-	bool autoload = 1;
+	bool autoload = true;
 	zend_class_entry *ce;
 
 	/* We do not use Z_PARAM_OBJ_OR_STR here to be able to exclude int, float, and bool which are bogus class names */
@@ -128,7 +128,7 @@ PHP_FUNCTION(class_implements)
 PHP_FUNCTION(class_uses)
 {
 	zval *obj;
-	bool autoload = 1;
+	bool autoload = true;
 	zend_class_entry *ce;
 
 	/* We do not use Z_PARAM_OBJ_OR_STR here to be able to exclude int, float, and bool which are bogus class names */
diff --git a/ext/spl/spl_array.c b/ext/spl/spl_array.c
index ea21b422229..163b937f194 100644
--- a/ext/spl/spl_array.c
+++ b/ext/spl/spl_array.c
@@ -777,11 +777,11 @@ static HashTable *spl_array_get_properties_for(zend_object *object, zend_prop_pu
 	 * meantime. */
 	switch (purpose) {
 		case ZEND_PROP_PURPOSE_ARRAY_CAST:
-			dup = 1;
+			dup = true;
 			break;
 		case ZEND_PROP_PURPOSE_VAR_EXPORT:
 		case ZEND_PROP_PURPOSE_JSON:
-			dup = 0;
+			dup = false;
 			break;
 		default:
 			return zend_std_get_properties_for(object, purpose);
diff --git a/ext/spl/spl_directory.c b/ext/spl/spl_directory.c
index 049d850d12f..a769d627a54 100644
--- a/ext/spl/spl_directory.c
+++ b/ext/spl/spl_directory.c
@@ -493,7 +493,7 @@ static spl_filesystem_object *spl_filesystem_object_create_info(zend_string *fil
 static spl_filesystem_object *spl_filesystem_object_create_type(int num_args, spl_filesystem_object *source, int type, zend_class_entry *ce, zval *return_value) /* {{{ */
 {
 	spl_filesystem_object *intern;
-	bool use_include_path = 0;
+	bool use_include_path = false;
 	zval arg1, arg2;
 	zend_error_handling error_handling;
 
@@ -2014,7 +2014,7 @@ PHP_METHOD(SplFileObject, __construct)
 	zend_string *file_name = NULL;
 	zend_string *open_mode = ZSTR_CHAR('r');
 	zval *stream_context = NULL;
-	bool use_include_path = 0;
+	bool use_include_path = false;
 	size_t path_len;
 	zend_error_handling error_handling;
 
diff --git a/ext/spl/spl_dllist.c b/ext/spl/spl_dllist.c
index 0f525e627d3..9401af3ae00 100644
--- a/ext/spl/spl_dllist.c
+++ b/ext/spl/spl_dllist.c
@@ -702,7 +702,7 @@ PHP_METHOD(SplDoublyLinkedList, offsetGet)
 PHP_METHOD(SplDoublyLinkedList, offsetSet)
 {
 	zend_long index;
-	bool index_is_null = 1;
+	bool index_is_null = true;
 	zval *value;
 	spl_dllist_object *intern;
 
diff --git a/ext/spl/spl_fixedarray.c b/ext/spl/spl_fixedarray.c
index dc32045ba0f..3d11d88f4f5 100644
--- a/ext/spl/spl_fixedarray.c
+++ b/ext/spl/spl_fixedarray.c
@@ -706,7 +706,7 @@ PHP_METHOD(SplFixedArray, fromArray)
 	spl_fixedarray array;
 	spl_fixedarray_object *intern;
 	int num;
-	bool save_indexes = 1;
+	bool save_indexes = true;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "a|b", &data, &save_indexes) == FAILURE) {
 		RETURN_THROWS();
diff --git a/ext/spl/spl_iterators.c b/ext/spl/spl_iterators.c
index 1ae4dae1eaa..a73e69519db 100644
--- a/ext/spl/spl_iterators.c
+++ b/ext/spl/spl_iterators.c
@@ -222,7 +222,7 @@ static zend_result spl_recursive_it_valid_ex(spl_recursive_it_object *object, zv
 	if (object->endIteration && object->in_iteration) {
 		zend_call_method_with_0_params(Z_OBJ_P(zthis), object->ce, &object->endIteration, "endIteration", NULL);
 	}
-	object->in_iteration = 0;
+	object->in_iteration = false;
 	return FAILURE;
 }
 
@@ -460,7 +460,7 @@ static void spl_recursive_it_rewind_ex(spl_recursive_it_object *object, zval *zt
 	if (!EG(exception) && object->beginIteration && !object->in_iteration) {
 		zend_call_method_with_0_params(Z_OBJ_P(zthis), object->ce, &object->beginIteration, "beginIteration", NULL);
 	}
-	object->in_iteration = 1;
+	object->in_iteration = true;
 	spl_recursive_it_move_forward_ex(object, zthis);
 }
 
@@ -614,7 +614,7 @@ static void spl_recursive_it_it_construct(INTERNAL_FUNCTION_PARAMETERS, zend_cla
 	intern->mode = mode;
 	intern->flags = (int)flags;
 	intern->max_depth = -1;
-	intern->in_iteration = 0;
+	intern->in_iteration = false;
 	intern->ce = Z_OBJCE_P(object);
 
 	intern->beginIteration = zend_hash_str_find_ptr(&intern->ce->function_table, "beginiteration", sizeof("beginiteration") - 1);
@@ -740,7 +740,7 @@ PHP_METHOD(RecursiveIteratorIterator, getSubIterator)
 {
 	spl_recursive_it_object   *object = Z_SPLRECURSIVE_IT_P(ZEND_THIS);
 	zend_long level;
-	bool level_is_null = 1;
+	bool level_is_null = true;
 	zval *value;
 
 	if (zend_parse_parameters(ZEND_NUM_ARGS(), "|l!", &level, &level_is_null) == FAILURE) {