Merge branch 'PHP-7.0' into PHP-7.1

* PHP-7.0:
  follow up fix on bug #74022

ext/openssl/openssl.c

@@ -2941,6 +2941,7 @@ PHP_FUNCTION(openssl_pkcs12_read)
 
 	if (d2i_PKCS12_bio(bio_in, &p12) && PKCS12_parse(p12, pass, &pkey, &cert, &ca)) {
 		BIO * bio_out;
+		int cert_num;
 
 		zval_dtor(zout);
 		array_init(zout);
@@ -2971,10 +2972,11 @@ PHP_FUNCTION(openssl_pkcs12_read)
 			BIO_free(bio_out);
 		}
 
-		if (ca && sk_X509_num(ca)) {
+		cert_num = sk_X509_num(ca);
+		if (ca && cert_num) {
 			array_init(&zextracerts);
 
-			for (i = 0; i < sk_X509_num(ca); i++) {
+			for (i = 0; i < cert_num; i++) {
 				zval zextracert;
 				X509* aCA = sk_X509_pop(ca);
 				if (!aCA) break;