diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index ed7a93c5409..b462cc8b7ad 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -1145,3 +1145,14 @@ PHP_FUNCTION(posix_initgroups)
 }
 /* }}} */
 #endif
+
+PHP_FUNCTION(posix_sysconf)
+{
+	zend_long conf_id;
+
+	ZEND_PARSE_PARAMETERS_START(1, 1)
+		Z_PARAM_LONG(conf_id)
+	ZEND_PARSE_PARAMETERS_END();
+
+	RETURN_LONG(sysconf(conf_id));
+}
diff --git a/ext/posix/posix.stub.php b/ext/posix/posix.stub.php
index d3df0cd69d4..ecb462695cc 100644
--- a/ext/posix/posix.stub.php
+++ b/ext/posix/posix.stub.php
@@ -191,6 +191,34 @@ const POSIX_RLIMIT_NPTS = UNKNOWN;
  */
 const POSIX_RLIMIT_INFINITY = UNKNOWN;
 #endif
+#ifdef _SC_ARG_MAX
+/**
+ * @var int
+ * @cvalue _SC_ARG_MAX
+ */
+const POSIX_SC_ARG_MAX = UNKNOWN;
+#endif
+#ifdef _SC_PAGESIZE
+/**
+ * @var int
+ * @cvalue _SC_PAGESIZE
+ */
+const POSIX_SC_PAGESIZE = UNKNOWN;
+#endif
+#ifdef _SC_NPROCESSORS_CONF
+/**
+ * @var int
+ * @cvalue _SC_NPROCESSORS_CONF
+ */
+const POSIX_SC_NPROCESSORS_CONF = UNKNOWN;
+#endif
+#ifdef _SC_NPROCESSORS_ONLN
+/**
+ * @var int
+ * @cvalue _SC_NPROCESSORS_ONLN
+ */
+const POSIX_SC_NPROCESSORS_ONLN = UNKNOWN;
+#endif
 
 function posix_kill(int $process_id, int $signal): bool {}
 
@@ -327,3 +355,5 @@ function posix_strerror(int $error_code): string {}
 #ifdef HAVE_INITGROUPS
 function posix_initgroups(string $username, int $group_id): bool {}
 #endif
+
+function posix_sysconf(int $conf_id): int {}
diff --git a/ext/posix/posix_arginfo.h b/ext/posix/posix_arginfo.h
index e91a9950447..f45e8644b29 100644
--- a/ext/posix/posix_arginfo.h
+++ b/ext/posix/posix_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: e7f501e4ca2c30f6bf52ea5912037c1e59743949 */
+ * Stub hash: 82454cec6f55336a530c23663efeb7ac71932bba */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_kill, 0, 2, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, process_id, IS_LONG, 0)
@@ -159,6 +159,10 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_initgroups, 0, 2, _IS_BOOL
 ZEND_END_ARG_INFO()
 #endif
 
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_posix_sysconf, 0, 1, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO(0, conf_id, IS_LONG, 0)
+ZEND_END_ARG_INFO()
+
 
 ZEND_FUNCTION(posix_kill);
 ZEND_FUNCTION(posix_getpid);
@@ -222,6 +226,7 @@ ZEND_FUNCTION(posix_strerror);
 #if defined(HAVE_INITGROUPS)
 ZEND_FUNCTION(posix_initgroups);
 #endif
+ZEND_FUNCTION(posix_sysconf);
 
 
 static const zend_function_entry ext_functions[] = {
@@ -288,6 +293,7 @@ static const zend_function_entry ext_functions[] = {
 #if defined(HAVE_INITGROUPS)
 	ZEND_FE(posix_initgroups, arginfo_posix_initgroups)
 #endif
+	ZEND_FE(posix_sysconf, arginfo_posix_sysconf)
 	ZEND_FE_END
 };
 
@@ -369,4 +375,16 @@ static void register_posix_symbols(int module_number)
 #if defined(HAVE_SETRLIMIT)
 	REGISTER_LONG_CONSTANT("POSIX_RLIMIT_INFINITY", RLIM_INFINITY, CONST_PERSISTENT);
 #endif
+#if defined(_SC_ARG_MAX)
+	REGISTER_LONG_CONSTANT("POSIX_SC_ARG_MAX", _SC_ARG_MAX, CONST_PERSISTENT);
+#endif
+#if defined(_SC_PAGESIZE)
+	REGISTER_LONG_CONSTANT("POSIX_SC_PAGESIZE", _SC_PAGESIZE, CONST_PERSISTENT);
+#endif
+#if defined(_SC_NPROCESSORS_CONF)
+	REGISTER_LONG_CONSTANT("POSIX_SC_NPROCESSORS_CONF", _SC_NPROCESSORS_CONF, CONST_PERSISTENT);
+#endif
+#if defined(_SC_NPROCESSORS_ONLN)
+	REGISTER_LONG_CONSTANT("POSIX_SC_NPROCESSORS_ONLN", _SC_NPROCESSORS_ONLN, CONST_PERSISTENT);
+#endif
 }
diff --git a/ext/posix/tests/posix_sysconf.phpt b/ext/posix/tests/posix_sysconf.phpt
new file mode 100644
index 00000000000..6acebe1f0e0
--- /dev/null
+++ b/ext/posix/tests/posix_sysconf.phpt
@@ -0,0 +1,14 @@
+--TEST--
+Test posix_sysconf
+--EXTENSIONS--
+posix
+--FILE--
+<?php
+var_dump(posix_sysconf(-1));
+var_dump(posix_errno() != 0);
+var_dump(posix_sysconf(POSIX_SC_NPROCESSORS_ONLN));
+?>
+--EXPECTF--
+int(-1)
+bool(false)
+int(%d)