diff --git a/ext/snmp/snmp.c b/ext/snmp/snmp.c
index a14bf2aed34c6..84e618f28ad01 100644
--- a/ext/snmp/snmp.c
+++ b/ext/snmp/snmp.c
@@ -913,7 +913,7 @@ static bool netsnmp_session_init(php_snmp_session **session_p, int version, zend
 		session->securityNameLen = ZSTR_LEN(community);
 	} else {
 		session->authenticator = NULL;
-		session->community = (u_char *)estrdup(ZSTR_VAL(community));
+		session->community = (uint8_t *)estrdup(ZSTR_VAL(community));
 		session->community_len = ZSTR_LEN(community);
 	}
 
@@ -1035,7 +1035,7 @@ static bool netsnmp_session_gen_auth_key(struct snmp_session *s, zend_string *pa
 	int snmp_errno;
 	s->securityAuthKeyLen = USM_AUTH_KU_LEN;
 	if ((snmp_errno = generate_Ku(s->securityAuthProto, s->securityAuthProtoLen,
-			(u_char *) ZSTR_VAL(pass), ZSTR_LEN(pass),
+			(uint8_t *) ZSTR_VAL(pass), ZSTR_LEN(pass),
 			s->securityAuthKey, &(s->securityAuthKeyLen)))) {
 		php_error_docref(NULL, E_WARNING, "Error generating a key for authentication pass phrase '%s': %s", ZSTR_VAL(pass), snmp_api_errstring(snmp_errno));
 		return false;
@@ -1051,7 +1051,7 @@ static bool netsnmp_session_gen_sec_key(struct snmp_session *s, zend_string *pas
 
 	s->securityPrivKeyLen = USM_PRIV_KU_LEN;
 	if ((snmp_errno = generate_Ku(s->securityAuthProto, s->securityAuthProtoLen,
-			(u_char *)ZSTR_VAL(pass), ZSTR_LEN(pass),
+			(uint8_t *)ZSTR_VAL(pass), ZSTR_LEN(pass),
 			s->securityPrivKey, &(s->securityPrivKeyLen)))) {
 		php_error_docref(NULL, E_WARNING, "Error generating a key for privacy pass phrase '%s': %s", ZSTR_VAL(pass), snmp_api_errstring(snmp_errno));
 		return false;
@@ -1064,7 +1064,7 @@ static bool netsnmp_session_gen_sec_key(struct snmp_session *s, zend_string *pas
 static bool netsnmp_session_set_contextEngineID(struct snmp_session *s, zend_string * contextEngineID)
 {
 	size_t	ebuf_len = 32, eout_len = 0;
-	u_char	*ebuf = (u_char *) emalloc(ebuf_len);
+	uint8_t	*ebuf = (uint8_t *) emalloc(ebuf_len);
 
 	if (!snmp_hex_to_binary(&ebuf, &ebuf_len, &eout_len, 1, ZSTR_VAL(contextEngineID))) {
 		// TODO Promote to Error?
diff --git a/ext/standard/dns.c b/ext/standard/dns.c
index ba147e353e3ef..456c76ab1af2f 100644
--- a/ext/standard/dns.c
+++ b/ext/standard/dns.c
@@ -356,7 +356,7 @@ static zend_string *php_gethostbyname(char *name)
 
 typedef union {
 	HEADER qb1;
-	u_char qb2[65536];
+	uint8_t qb2[65536];
 } querybuf;
 
 /* just a hack to free resources allocated by glibc in __res_nsend()
@@ -463,13 +463,13 @@ PHP_FUNCTION(dns_check_record)
 } while (0)
 
 /* {{{ php_parserr */
-static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_to_fetch, int store, int raw, zval *subarray)
+static uint8_t *php_parserr(uint8_t *cp, uint8_t *end, querybuf *answer, int type_to_fetch, int store, bool raw, zval *subarray)
 {
 	u_short type, class, dlen;
 	u_long ttl;
 	long n, i;
 	u_short s;
-	u_char *tp, *p;
+	uint8_t *tp, *p;
 	char name[MAXHOSTNAMELEN] = {0};
 	int have_v6_break = 0, in_v6_break = 0;
 
@@ -648,12 +648,12 @@ static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_t
 			add_assoc_long(subarray, "minimum-ttl", n);
 			break;
 		case DNS_T_AAAA:
-			tp = (u_char*)name;
+			tp = (uint8_t*)name;
 			CHECKCP(8*2);
 			for(i=0; i < 8; i++) {
 				GETSHORT(s, cp);
 				if (s != 0) {
-					if (tp > (u_char *)name) {
+					if (tp > (uint8_t *)name) {
 						in_v6_break = 0;
 						tp[0] = ':';
 						tp++;
@@ -688,7 +688,7 @@ static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_t
 			n = ((int)cp[0]) & 0xFF;
 			cp++;
 			add_assoc_long(subarray, "masklen", n);
-			tp = (u_char*)name;
+			tp = (uint8_t*)name;
 			if (n > 15) {
 				have_v6_break = 1;
 				in_v6_break = 1;
@@ -698,7 +698,7 @@ static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_t
 			if (n % 16 > 8) {
 				/* Partial short */
 				if (cp[0] != 0) {
-					if (tp > (u_char *)name) {
+					if (tp > (uint8_t *)name) {
 						in_v6_break = 0;
 						tp[0] = ':';
 						tp++;
@@ -723,7 +723,7 @@ static u_char *php_parserr(u_char *cp, u_char *end, querybuf *answer, int type_t
 				CHECKCP(2);
 				GETSHORT(s, cp);
 				if (s != 0) {
-					if (tp > (u_char *)name) {
+					if (tp > (uint8_t *)name) {
 						in_v6_break = 0;
 						tp[0] = ':';
 						tp++;
@@ -840,7 +840,7 @@ PHP_FUNCTION(dns_get_record)
 #endif
 	HEADER *hp;
 	querybuf answer = {0};
-	u_char *cp = NULL, *end = NULL;
+	uint8_t *cp = NULL, *end = NULL;
 	int n, qd, an, ns = 0, ar = 0;
 	int type, first_query = 1, store_results = 1;
 	bool raw = 0;
@@ -1072,7 +1072,7 @@ PHP_FUNCTION(dns_get_mx)
 	querybuf answer = {0};
 	char buf[MAXHOSTNAMELEN] = {0};
 	HEADER *hp;
-	u_char *cp, *end;
+	uint8_t *cp, *end;
 	int i;
 #if defined(HAVE_DNS_SEARCH)
 	struct sockaddr_storage from;
@@ -1116,7 +1116,7 @@ PHP_FUNCTION(dns_get_mx)
 	res_init();
 #endif
 
-	i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, answer.qb2, sizeof answer);
+	i = php_dns_search(handle, hostname, C_IN, DNS_T_MX, answer.qb2, sizeof(answer));
 	if (i < 0) {
 		php_dns_free_handle(handle);
 		RETURN_FALSE;
diff --git a/ext/standard/dns_win32.c b/ext/standard/dns_win32.c
index bef90cd61f283..25fdccbfcf987 100644
--- a/ext/standard/dns_win32.c
+++ b/ext/standard/dns_win32.c
@@ -141,7 +141,7 @@ PHP_FUNCTION(dns_check_record)
 /* }}} */
 
 /* {{{ php_parserr */
-static void php_parserr(PDNS_RECORD pRec, int type_to_fetch, int store, int raw, zval *subarray)
+static void php_parserr(PDNS_RECORD pRec, int type_to_fetch, int store, bool raw, zval *subarray)
 {
 	int type;
 	u_long ttl;
@@ -271,7 +271,7 @@ static void php_parserr(PDNS_RECORD pRec, int type_to_fetch, int store, int raw,
 
 				for(i=0; i < 8; i++) {
 					if (out[i] != 0) {
-						if (tp > (u_char *)buf) {
+						if (tp > (uint8_t *)buf) {
 							in_v6_break = 0;
 							tp[0] = ':';
 							tp++;
diff --git a/win32/glob.c b/win32/glob.c
index e9889ebdda078..5dd0f4661acbe 100644
--- a/win32/glob.c
+++ b/win32/glob.c
@@ -159,7 +159,7 @@ static void	 qprintf(const char *, Char *);
 
 PHPAPI int glob(const char *pattern, int flags, int (*errfunc)(const char *, int), glob_t *pglob)
 {
-	const u_char *patnext;
+	const uint8_t *patnext;
 	int c;
 	Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 
@@ -170,7 +170,7 @@ PHPAPI int glob(const char *pattern, int flags, int (*errfunc)(const char *, int
 	flags |= GLOB_NOESCAPE;
 #endif
 
-	patnext = (u_char *) pattern;
+	patnext = (uint8_t *) pattern;
 	if (!(flags & GLOB_APPEND)) {
 		pglob->gl_pathc = 0;
 		pglob->gl_pathv = NULL;
@@ -625,14 +625,14 @@ static int glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend
 	else
 		readdirfunc = readdir;
 	while ((dp = (*readdirfunc)(dirp))) {
-		register u_char *sc;
+		register uint8_t *sc;
 		register Char *dc;
 
 		/* Initial DOT must be matched literally. */
 		if (dp->d_name[0] == DOT && *pattern != DOT)
 			continue;
 		dc = pathend;
-		sc = (u_char *) dp->d_name;
+		sc = (uint8_t *) dp->d_name;
 		while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 			;
 		if (dc >= pathend_last) {