diff --git a/ext/standard/basic_functions.c b/ext/standard/basic_functions.c
index f26bef3daa4e..7c05a1948fbf 100644
--- a/ext/standard/basic_functions.c
+++ b/ext/standard/basic_functions.c
@@ -2578,3 +2578,23 @@ PHP_FUNCTION(sys_getloadavg)
 }
 /* }}} */
 #endif
+
+PHP_FUNCTION(num_available_processors)
+{
+	ZEND_PARSE_PARAMETERS_NONE();
+
+#if defined(_SC_NPROCESSORS_ONLN)
+	int nprocs = sysconf(_SC_NPROCESSORS_ONLN);
+	if (nprocs > 0) {
+		RETURN_LONG(nprocs);
+	}
+#elif defined _WIN32 && ! defined __CYGWIN__
+	SYSTEM_INFO system_info;
+	GetSystemInfo (&system_info);
+	if (system_info.dwNumberOfProcessors > 0) {
+		RETURN_LONG(system_info.dwNumberOfProcessors);
+	}
+#endif
+
+	RETURN_NULL();
+}
diff --git a/ext/standard/basic_functions.stub.php b/ext/standard/basic_functions.stub.php
index 09f63860f116..923422e0c7ce 100644
--- a/ext/standard/basic_functions.stub.php
+++ b/ext/standard/basic_functions.stub.php
@@ -3834,3 +3834,5 @@ function sapi_windows_set_ctrl_handler(?callable $handler, bool $add = true): bo
 
 function sapi_windows_generate_ctrl_event(int $event, int $pid = 0): bool {}
 #endif
+
+function num_available_processors(): ?int {}
\ No newline at end of file
diff --git a/ext/standard/basic_functions_arginfo.h b/ext/standard/basic_functions_arginfo.h
index d221a221f413..abb295aab884 100644
--- a/ext/standard/basic_functions_arginfo.h
+++ b/ext/standard/basic_functions_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: dfd7d2cfd31312f7f6c5074c10cab54e9d1fbccc */
+ * Stub hash: 1eda5d340b462c9d6fbb43d3e27aef20e334e1ab */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)
@@ -2184,6 +2184,9 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_sapi_windows_generate_ctrl_event
 ZEND_END_ARG_INFO()
 #endif
 
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_num_available_processors, 0, 0, IS_LONG, 1)
+ZEND_END_ARG_INFO()
+
 
 ZEND_FRAMELESS_FUNCTION(min, 2);
 static const zend_frameless_function_info frameless_function_infos_min[] = {
@@ -2879,6 +2882,7 @@ ZEND_FUNCTION(sapi_windows_cp_is_utf8);
 ZEND_FUNCTION(sapi_windows_set_ctrl_handler);
 ZEND_FUNCTION(sapi_windows_generate_ctrl_event);
 #endif
+ZEND_FUNCTION(num_available_processors);
 
 static const zend_function_entry ext_functions[] = {
 	ZEND_FE(set_time_limit, arginfo_set_time_limit)
@@ -3491,6 +3495,7 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_FE(sapi_windows_set_ctrl_handler, arginfo_sapi_windows_set_ctrl_handler)
 	ZEND_FE(sapi_windows_generate_ctrl_event, arginfo_sapi_windows_generate_ctrl_event)
 #endif
+	ZEND_FE(num_available_processors, arginfo_num_available_processors)
 	ZEND_FE_END
 };
 
diff --git a/ext/standard/tests/general_functions/num_available_processors.phpt b/ext/standard/tests/general_functions/num_available_processors.phpt
new file mode 100644
index 000000000000..e3fe40c119d5
--- /dev/null
+++ b/ext/standard/tests/general_functions/num_available_processors.phpt
@@ -0,0 +1,16 @@
+--TEST--
+num_available_processors() tests
+--SKIPIF--
+<?php
+if (!function_exists("num_available_processors")) die("skip");
+?>
+--FILE--
+<?php
+
+var_dump(num_available_processors());
+
+echo "Done\n";
+?>
+--EXPECTF--
+int(%d)
+Done