diff --git a/UPGRADING b/UPGRADING
index 92824112259..28454f24ed8 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -381,6 +381,10 @@ PHP 8.0 UPGRADE NOTES
 10. New Global Constants
 ========================================
 
+- Filter:
+  . FILTER_VALIDATE_BOOL has been added as an alias for FILTER_VALIDATE_BOOLEAN.
+    The new name is preferred, as it uses the canonical type name.
+
 ========================================
 11. Changes to INI File Handling
 ========================================
diff --git a/ext/filter/filter.c b/ext/filter/filter.c
index 23ef0bdf9bc..d91f050a95f 100644
--- a/ext/filter/filter.c
+++ b/ext/filter/filter.c
@@ -37,7 +37,7 @@ typedef struct filter_list_entry {
 /* {{{ filter_list */
 static const filter_list_entry filter_list[] = {
 	{ "int",             FILTER_VALIDATE_INT,           php_filter_int             },
-	{ "boolean",         FILTER_VALIDATE_BOOLEAN,       php_filter_boolean         },
+	{ "boolean",         FILTER_VALIDATE_BOOL,          php_filter_boolean         },
 	{ "float",           FILTER_VALIDATE_FLOAT,         php_filter_float           },
 
 	{ "validate_regexp", FILTER_VALIDATE_REGEXP,        php_filter_validate_regexp },
@@ -190,7 +190,8 @@ PHP_MINIT_FUNCTION(filter)
 	REGISTER_LONG_CONSTANT("FILTER_NULL_ON_FAILURE", FILTER_NULL_ON_FAILURE, CONST_CS | CONST_PERSISTENT);
 
 	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_INT", FILTER_VALIDATE_INT, CONST_CS | CONST_PERSISTENT);
-	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_BOOLEAN", FILTER_VALIDATE_BOOLEAN, CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_BOOLEAN", FILTER_VALIDATE_BOOL, CONST_CS | CONST_PERSISTENT);
+	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_BOOL", FILTER_VALIDATE_BOOL, CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_FLOAT", FILTER_VALIDATE_FLOAT, CONST_CS | CONST_PERSISTENT);
 
 	REGISTER_LONG_CONSTANT("FILTER_VALIDATE_REGEXP", FILTER_VALIDATE_REGEXP, CONST_CS | CONST_PERSISTENT);
diff --git a/ext/filter/filter_private.h b/ext/filter/filter_private.h
index 5dcbd5c3cc3..f8a02a49077 100644
--- a/ext/filter/filter_private.h
+++ b/ext/filter/filter_private.h
@@ -56,7 +56,7 @@
 #define FILTER_FLAG_EMAIL_UNICODE          0x100000
 
 #define FILTER_VALIDATE_INT           0x0101
-#define FILTER_VALIDATE_BOOLEAN       0x0102
+#define FILTER_VALIDATE_BOOL          0x0102
 #define FILTER_VALIDATE_FLOAT         0x0103
 
 #define FILTER_VALIDATE_REGEXP        0x0110
diff --git a/ext/filter/tests/061.phpt b/ext/filter/tests/061.phpt
new file mode 100644
index 00000000000..b8b3a5186ac
--- /dev/null
+++ b/ext/filter/tests/061.phpt
@@ -0,0 +1,70 @@
+--TEST--
+filter_var() and FILTER_VALIDATE_BOOL
+--SKIPIF--
+<?php if (!extension_loaded("filter")) die("skip"); ?>
+--FILE--
+<?php
+
+class test {
+
+	function __toString() {
+		return "blah";
+	}
+}
+
+$t = new test;
+
+var_dump(filter_var("no", FILTER_VALIDATE_BOOL));
+var_dump(filter_var(NULL, FILTER_VALIDATE_BOOL));
+var_dump(filter_var($t, FILTER_VALIDATE_BOOL));
+var_dump(filter_var(array(1,2,3,0,array("", "123")), FILTER_VALIDATE_BOOL, FILTER_REQUIRE_ARRAY));
+var_dump(filter_var("yes", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("true", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("false", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("off", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("on", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("0", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("1", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("NONE", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("", FILTER_VALIDATE_BOOL));
+var_dump(filter_var(-1, FILTER_VALIDATE_BOOL));
+var_dump(filter_var("000000", FILTER_VALIDATE_BOOL));
+var_dump(filter_var("111111", FILTER_VALIDATE_BOOL));
+
+
+echo "Done\n";
+?>
+--EXPECT--
+bool(false)
+bool(false)
+bool(false)
+array(5) {
+  [0]=>
+  bool(true)
+  [1]=>
+  bool(false)
+  [2]=>
+  bool(false)
+  [3]=>
+  bool(false)
+  [4]=>
+  array(2) {
+    [0]=>
+    bool(false)
+    [1]=>
+    bool(false)
+  }
+}
+bool(true)
+bool(true)
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+Done