diff --git a/Zend/zend_execute.c b/Zend/zend_execute.c
index 11a140e845335..e3ed5ddd36d6f 100644
--- a/Zend/zend_execute.c
+++ b/Zend/zend_execute.c
@@ -4189,9 +4189,8 @@ static zend_never_inline zend_execute_data *zend_init_dynamic_call_array(zend_ar
 }
 /* }}} */
 
-#define ZEND_FAKE_OP_ARRAY ((zend_op_array*)(zend_intptr_t)-1)
 
-static zend_never_inline zend_op_array* ZEND_FASTCALL zend_include_or_eval(zval *inc_filename, int type) /* {{{ */
+zend_never_inline zend_op_array* ZEND_FASTCALL zend_include_or_eval(zval *inc_filename, int type) /* {{{ */
 {
 	zend_op_array *new_op_array = NULL;
 	zval tmp_inc_filename;
diff --git a/Zend/zend_execute.h b/Zend/zend_execute.h
index 3339f3992da35..cdcab60901130 100644
--- a/Zend/zend_execute.h
+++ b/Zend/zend_execute.h
@@ -76,6 +76,9 @@ ZEND_API ZEND_COLD void zend_verify_return_error(
 ZEND_API bool zend_verify_ref_array_assignable(zend_reference *ref);
 ZEND_API bool zend_value_instanceof_static(zval *zv);
 
+extern zend_op_array* ZEND_FASTCALL zend_include_or_eval(zval *inc_filename, int type);
+
+#define ZEND_FAKE_OP_ARRAY ((zend_op_array*)(zend_intptr_t)-1)
 
 #define ZEND_REF_TYPE_SOURCES(ref) \
 	(ref)->sources
diff --git a/ext/spl/php_spl.c b/ext/spl/php_spl.c
index 5981d2385f0c7..ca2081cef735d 100644
--- a/ext/spl/php_spl.c
+++ b/ext/spl/php_spl.c
@@ -413,6 +413,36 @@ static bool autoload_func_info_equals(
 }
 
 static zend_class_entry *spl_perform_autoload(zend_string *class_name, zend_string *lc_name) {
+	/*  classmap provides for classname => path resolution without needing to invoke a user function */
+	if (SPL_G(autoload_classmap)) {
+		zval *mf = zend_hash_find_deref(SPL_G(autoload_classmap), lc_name);
+		if (mf) {
+			if (Z_TYPE_P(mf) != IS_STRING) {
+				zend_type_error("Error during autoloading from classmap. Entry \"%s\" expected a string value, %s given",  ZSTR_VAL(lc_name), zend_zval_type_name(mf));
+				return NULL;
+			}
+			
+			zend_op_array *op_array = zend_include_or_eval(mf, ZEND_REQUIRE);
+			if (op_array != NULL && op_array != ZEND_FAKE_OP_ARRAY) {
+				destroy_op_array(op_array);
+				efree_size(op_array, sizeof(zend_op_array));
+			}
+			
+			if (EG(exception)) {
+				return NULL;
+			}
+			
+			zend_class_entry *ce = zend_hash_find_ptr(EG(class_table), lc_name);
+			if (ce) {
+				return ce;
+			}
+			
+			/* if the item is in the classmap it must be valid after including the file */
+			zend_throw_error(NULL, "Error during autoloading from classmap. Entry \"%s\" failed to load the class from \"%s\" (Class undefined after file included)", ZSTR_VAL(lc_name), Z_STRVAL_P(mf));
+			return NULL;
+		}
+	}
+	
 	if (!SPL_G(autoload_functions)) {
 		return NULL;
 	}
@@ -625,6 +655,38 @@ PHP_FUNCTION(spl_autoload_functions)
 	}
 } /* }}} */
 
+
+/* {{{ Assign an array of name => path mappings to the autoloader */
+PHP_FUNCTION(autoload_set_classmap)
+{
+	HashTable *ht;
+	
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_ARRAY_HT(ht)
+	ZEND_PARSE_PARAMETERS_END();
+	
+	if (SPL_G(autoload_classmap)) {
+		zend_throw_error(NULL, "Classmap Autoloader can only be initialized once per request.");
+		RETURN_THROWS();
+	}
+	
+	GC_TRY_ADDREF(ht);
+	SPL_G(autoload_classmap) = ht;
+} /* }}} */
+
+/* {{{ Assign an array of name => path mappings to the autoloader */
+PHP_FUNCTION(autoload_get_classmap)
+{
+	ZEND_PARSE_PARAMETERS_NONE();
+	
+	if (SPL_G(autoload_classmap)) {
+		GC_TRY_ADDREF(SPL_G(autoload_classmap));
+		RETURN_ARR(SPL_G(autoload_classmap));
+	}
+	
+	RETURN_EMPTY_ARRAY();
+} /* }}} */
+
 /* {{{ Return hash id for given object */
 PHP_FUNCTION(spl_object_hash)
 {
@@ -732,6 +794,7 @@ PHP_RINIT_FUNCTION(spl) /* {{{ */
 {
 	SPL_G(autoload_extensions) = NULL;
 	SPL_G(autoload_functions) = NULL;
+	SPL_G(autoload_classmap) = NULL;
 	SPL_G(hash_mask_init) = 0;
 	return SUCCESS;
 } /* }}} */
@@ -742,6 +805,10 @@ PHP_RSHUTDOWN_FUNCTION(spl) /* {{{ */
 		zend_string_release_ex(SPL_G(autoload_extensions), 0);
 		SPL_G(autoload_extensions) = NULL;
 	}
+	if (SPL_G(autoload_classmap)) {
+		zend_array_release(SPL_G(autoload_classmap));
+		SPL_G(autoload_classmap) = NULL;
+	}
 	if (SPL_G(autoload_functions)) {
 		zend_hash_destroy(SPL_G(autoload_functions));
 		FREE_HASHTABLE(SPL_G(autoload_functions));
diff --git a/ext/spl/php_spl.h b/ext/spl/php_spl.h
index 8009cbbb06e9a..3313e28e7ee55 100644
--- a/ext/spl/php_spl.h
+++ b/ext/spl/php_spl.h
@@ -54,6 +54,7 @@ PHP_MINFO_FUNCTION(spl);
 ZEND_BEGIN_MODULE_GLOBALS(spl)
 	zend_string *autoload_extensions;
 	HashTable   *autoload_functions;
+	HashTable   *autoload_classmap;
 	intptr_t     hash_mask_handle;
 	intptr_t     hash_mask_handlers;
 	int          hash_mask_init;
diff --git a/ext/spl/php_spl.stub.php b/ext/spl/php_spl.stub.php
index e7cc10dbc3510..81b9d33d24710 100644
--- a/ext/spl/php_spl.stub.php
+++ b/ext/spl/php_spl.stub.php
@@ -34,3 +34,7 @@ function iterator_apply(Traversable $iterator, callable $callback, ?array $args
 function iterator_count(Traversable $iterator): int {}
 
 function iterator_to_array(Traversable $iterator, bool $preserve_keys = true): array {}
+
+function autoload_set_classmap(array $mapping): void {}
+
+function autoload_get_classmap(): array {}
\ No newline at end of file
diff --git a/ext/spl/php_spl_arginfo.h b/ext/spl/php_spl_arginfo.h
index bd2a180764f67..d4400de0a4934 100644
--- a/ext/spl/php_spl_arginfo.h
+++ b/ext/spl/php_spl_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 54d193c03c2652ce40adabd10d88666a86e32728 */
+ * Stub hash: dc37ffc6559b505fa389a6b0445d00a210e8eddf */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_class_implements, 0, 1, MAY_BE_ARRAY|MAY_BE_FALSE)
 	ZEND_ARG_INFO(0, object_or_class)
@@ -61,6 +61,12 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_iterator_to_array, 0, 1, IS_ARRA
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, preserve_keys, _IS_BOOL, 0, "true")
 ZEND_END_ARG_INFO()
 
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_autoload_set_classmap, 0, 1, IS_VOID, 0)
+	ZEND_ARG_TYPE_INFO(0, mapping, IS_ARRAY, 0)
+ZEND_END_ARG_INFO()
+
+#define arginfo_autoload_get_classmap arginfo_spl_autoload_functions
+
 
 ZEND_FUNCTION(class_implements);
 ZEND_FUNCTION(class_parents);
@@ -77,6 +83,8 @@ ZEND_FUNCTION(spl_object_id);
 ZEND_FUNCTION(iterator_apply);
 ZEND_FUNCTION(iterator_count);
 ZEND_FUNCTION(iterator_to_array);
+ZEND_FUNCTION(autoload_set_classmap);
+ZEND_FUNCTION(autoload_get_classmap);
 
 
 static const zend_function_entry ext_functions[] = {
@@ -95,5 +103,7 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_FE(iterator_apply, arginfo_iterator_apply)
 	ZEND_FE(iterator_count, arginfo_iterator_count)
 	ZEND_FE(iterator_to_array, arginfo_iterator_to_array)
+	ZEND_FE(autoload_set_classmap, arginfo_autoload_set_classmap)
+	ZEND_FE(autoload_get_classmap, arginfo_autoload_get_classmap)
 	ZEND_FE_END
 };
diff --git a/ext/spl/tests/autoload_set_classmap_001.phpt b/ext/spl/tests/autoload_set_classmap_001.phpt
new file mode 100644
index 0000000000000..a94816d333a96
--- /dev/null
+++ b/ext/spl/tests/autoload_set_classmap_001.phpt
@@ -0,0 +1,40 @@
+--TEST--
+autoload_set_classmap Basic Operation
+--FILE--
+<?php
+
+$classes = ['Example', 'Foo\NamespacedExample'];
+$classes_map = [];
+
+@mkdir(sys_get_temp_dir() . '/foo');
+
+foreach ($classes as $class) {
+    $p = explode("\\", $class);
+    $class_name = array_pop($p);
+    $namespace = implode('\\', $p);
+
+    $class = strtolower($class);
+
+    $class_str = '<?php ' . ($namespace ? ('namespace ' . $namespace . ';') : '') . ' class ' . $class_name . '{ }';
+    $path = sys_get_temp_dir() . '/' . str_replace('\\', '/', $class) . '.php';
+    file_put_contents($path, $class_str);
+
+    $classes_map[$class] = $path;
+}
+
+autoload_set_classmap($classes_map);
+
+echo get_debug_type(new Example()) . "\n";
+echo get_debug_type(new Foo\NamespacedExample()) . "\n";
+
+print_r(autoload_get_classmap());
+
+?>
+--EXPECTF--
+Example
+Foo\NamespacedExample
+Array
+(
+    [example] => %s/example.php
+    [foo\namespacedexample] => %s/namespacedexample.php
+)
\ No newline at end of file
diff --git a/ext/spl/tests/autoload_set_classmap_002.phpt b/ext/spl/tests/autoload_set_classmap_002.phpt
new file mode 100644
index 0000000000000..6450968f63a2e
--- /dev/null
+++ b/ext/spl/tests/autoload_set_classmap_002.phpt
@@ -0,0 +1,16 @@
+--TEST--
+autoload_set_classmap Reject non-string values
+--FILE--
+<?php
+
+try {
+    autoload_set_classmap(['foo' => 123]);
+    new Foo();
+}
+catch (\Throwable $ex) {
+    echo get_class($ex) . ' - ' . $ex->getMessage();
+}
+
+?>
+--EXPECT--
+TypeError - Error during autoloading from classmap. Entry "foo" expected a string value, int given
diff --git a/ext/spl/tests/autoload_set_classmap_003.phpt b/ext/spl/tests/autoload_set_classmap_003.phpt
new file mode 100644
index 0000000000000..1dc7bfd3cdf9d
--- /dev/null
+++ b/ext/spl/tests/autoload_set_classmap_003.phpt
@@ -0,0 +1,20 @@
+--TEST--
+autoload_set_classmap Throw error if mapped file did not contain class
+--FILE--
+<?php
+
+$tmp_file = sys_get_temp_dir() . '/ThisFileIsEmpty.php';
+file_put_contents($tmp_file, '<?php ');
+
+autoload_set_classmap(['foo' => $tmp_file]);
+
+try {
+    new Foo();
+}
+catch (\Throwable $ex) {
+    echo get_class($ex) . ' - ' . $ex->getMessage();
+}
+
+?>
+--EXPECTF--
+Error - Error during autoloading from classmap. Entry "foo" failed to load the class from "%s/ThisFileIsEmpty.php" (Class undefined after file included)
diff --git a/ext/spl/tests/autoload_set_classmap_004.phpt b/ext/spl/tests/autoload_set_classmap_004.phpt
new file mode 100644
index 0000000000000..dce73f50aef2d
--- /dev/null
+++ b/ext/spl/tests/autoload_set_classmap_004.phpt
@@ -0,0 +1,16 @@
+--TEST--
+autoload_set_classmap Map can only be initialized once
+--FILE--
+<?php
+
+try {
+    autoload_set_classmap(['foo' => '/Foo']);
+    autoload_set_classmap(['foo' => '/Foo']);
+}
+catch (\Throwable $ex) {
+    echo get_class($ex) . ' - ' . $ex->getMessage();
+}
+
+?>
+--EXPECT--
+Error - Classmap Autoloader can only be initialized once per request.