diff --git a/ext/curl/interface.c b/ext/curl/interface.c
index 311b2f7cc8a59..5be9327566b19 100644
--- a/ext/curl/interface.c
+++ b/ext/curl/interface.c
@@ -843,7 +843,7 @@ static size_t curl_read(char *data, size_t size, size_t nmemb, void *ctx)
 {
 	php_curl *ch = (php_curl *)ctx;
 	php_curl_read *read_handler = ch->handlers.read;
-	int length = 0;
+	size_t length = 0;
 
 	switch (read_handler->method) {
 		case PHP_CURL_DIRECT:
@@ -1184,7 +1184,6 @@ static void create_certinfo(struct curl_certinfo *ci, zval *listcode)
 
 			array_init(&certhash);
 			for (slist = ci->certinfo[i]; slist; slist = slist->next) {
-				int len;
 				char s[64];
 				char *tmp;
 				strncpy(s, slist->data, sizeof(s));
@@ -1192,7 +1191,7 @@ static void create_certinfo(struct curl_certinfo *ci, zval *listcode)
 				tmp = memchr(s, ':', sizeof(s));
 				if(tmp) {
 					*tmp = '\0';
-					len = strlen(s);
+					size_t len = strlen(s);
 					add_assoc_string(&certhash, s, &slist->data[len+1]);
 				} else {
 					php_error_docref(NULL, E_WARNING, "Could not extract hash key from certificate info");
@@ -1445,7 +1444,6 @@ static inline zend_result build_mime_structure_from_hash(php_curl *ch, zval *zpo
 			zval *prop, rv;
 			char *type = NULL, *filename = NULL;
 			struct mime_data_cb_arg *cb_arg;
-			php_stream *stream;
 			php_stream_statbuf ssb;
 			size_t filesize = -1;
 			curl_seek_callback seekfunc = seek_cb;
@@ -1475,6 +1473,7 @@ static inline zend_result build_mime_structure_from_hash(php_curl *ch, zval *zpo
 				zval_ptr_dtor(&ch->postfields);
 				ZVAL_COPY(&ch->postfields, zpostfields);
 
+				php_stream *stream;
 				if ((stream = php_stream_open_wrapper(ZSTR_VAL(postval), "rb", STREAM_MUST_SEEK, NULL))) {
 					if (!stream->readfilters.head && !php_stream_stat(stream, &ssb)) {
 						filesize = ssb.sb.st_size;
@@ -2409,7 +2408,7 @@ PHP_FUNCTION(curl_setopt_array)
 	ch = Z_CURL_P(zid);
 
 	ZEND_HASH_FOREACH_KEY_VAL(Z_ARRVAL_P(arr), option, string_key, entry) {
-		if (string_key) {
+		if (UNEXPECTED(string_key)) {
 			zend_argument_value_error(2, "contains an invalid cURL option");
 			RETURN_THROWS();
 		}
diff --git a/ext/curl/multi.c b/ext/curl/multi.c
index 938393f410e70..3d97b581be764 100644
--- a/ext/curl/multi.c
+++ b/ext/curl/multi.c
@@ -403,7 +403,7 @@ static int _php_server_push_callback(CURL *parent_ch, CURL *easy, size_t num_hea
 	php_curl 				*ch;
 	php_curl 				*parent;
 	php_curlm 				*mh 			= (php_curlm *)userp;
-	size_t 					rval 			= CURL_PUSH_DENY;
+	int 					rval 			= CURL_PUSH_DENY;
 	zval					*pz_parent_ch 	= NULL;
 	zval 					pz_ch;
 	zval 					headers;
@@ -524,11 +524,7 @@ PHP_FUNCTION(curl_multi_setopt)
 
 	mh = Z_CURL_MULTI_P(z_mh);
 
-	if (_php_curl_multi_setopt(mh, options, zvalue, return_value)) {
-		RETURN_TRUE;
-	} else {
-		RETURN_FALSE;
-	}
+	RETURN_BOOL(_php_curl_multi_setopt(mh, options, zvalue, return_value));
 }
 /* }}} */
 
diff --git a/ext/curl/share.c b/ext/curl/share.c
index 8f3bb7543a20f..e5f9e3d807dc2 100644
--- a/ext/curl/share.c
+++ b/ext/curl/share.c
@@ -54,7 +54,7 @@ PHP_FUNCTION(curl_share_close)
 }
 /* }}} */
 
-static bool _php_curl_share_setopt(php_curlsh *sh, zend_long option, zval *zvalue, zval *return_value) /* {{{ */
+static bool _php_curl_share_setopt(php_curlsh *sh, zend_long option, const zval *zvalue) /* {{{ */
 {
 	CURLSHcode error = CURLSHE_OK;
 
@@ -91,11 +91,7 @@ PHP_FUNCTION(curl_share_setopt)
 
 	sh = Z_CURL_SHARE_P(z_sh);
 
-	if (_php_curl_share_setopt(sh, options, zvalue, return_value)) {
-		RETURN_TRUE;
-	} else {
-		RETURN_FALSE;
-	}
+	RETURN_BOOL(_php_curl_share_setopt(sh, options, zvalue));
 }
 /* }}} */