commit 4d77af8d7d349b7b9e43082deb47c1469f450115
Author: Philip Prindeville <philipp@redfish-solutions.com>
Date:   Fri Aug 18 12:05:44 2017 -0600

    Backport of fix for Issue #74860

diff --git a/configure.in b/configure.in
index 9acf42b..559a274 100644
--- a/configure.in
+++ b/configure.in
@@ -1470,7 +1470,7 @@ PHP_ADD_SOURCES(main, main.c snprintf.c spprintf.c php_sprintf.c \
        php_ini.c SAPI.c rfc1867.c php_content_types.c strlcpy.c \
        strlcat.c mergesort.c reentrancy.c php_variables.c php_ticks.c \
        network.c php_open_temporary_file.c \
-       output.c getopt.c, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
+       output.c getopt.c php_syslog.c, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
 
 PHP_ADD_SOURCES_X(main, fastcgi.c, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1, PHP_FASTCGI_OBJS, no)
 
diff --git a/ext/standard/php_smart_string.h b/ext/standard/php_smart_string.h
index adb78c0..8d90688 100644
--- a/ext/standard/php_smart_string.h
+++ b/ext/standard/php_smart_string.h
@@ -146,4 +146,8 @@
 #define smart_string_sets(dest, src) \
 	smart_string_setl((dest), (src), strlen(src));
 
+#define smart_string_reset(dest) do {		\
+	(dest)->len = 0;			\
+} while (0)
+
 #endif
diff --git a/main/php_syslog.c b/main/php_syslog.c
new file mode 100644
index 0000000..43d1f56
--- /dev/null
+++ b/main/php_syslog.c
@@ -0,0 +1,80 @@
+/*
+   +----------------------------------------------------------------------+
+   | PHP Version 7                                                        |
+   +----------------------------------------------------------------------+
+   | Copyright (c) 2017 The PHP Group                                |
+   +----------------------------------------------------------------------+
+   | This source file is subject to version 3.01 of the PHP license,      |
+   | that is bundled with this package in the file LICENSE, and is        |
+   | available through the world-wide-web at the following url:           |
+   | http://www.php.net/license/3_01.txt                                  |
+   | If you did not receive a copy of the PHP license and are unable to   |
+   | obtain it through the world-wide-web, please send a note to          |
+   | license@php.net so we can mail you a copy immediately.               |
+   +----------------------------------------------------------------------+
+   | Author: Philip Prindeville <philipp@redfish-solutions.com>           |
+   +----------------------------------------------------------------------+
+*/
+
+/* $Id$ */
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <stdlib.h>
+#include "php.h"
+#include "php_syslog.h"
+
+#include "zend.h"
+#include "ext/standard/php_smart_string.h"
+
+/*
+ * The SCO OpenServer 5 Development System (not the UDK)
+ * defines syslog to std_syslog.
+ */
+
+#ifdef HAVE_STD_SYSLOG
+#define syslog std_syslog
+#endif
+
+PHPAPI void php_syslog(int priority, const char *format, ...) /* {{{ */
+{
+	const char *ptr;
+	unsigned char c;
+	char *message = NULL;
+	smart_string sbuf = {0};
+	va_list args;
+
+	va_start(args, format);
+	vspprintf(&message, 0, format, args);
+	va_end(args);
+
+	for (ptr = message; ; ++ptr) {
+		c = *ptr;
+		if (c == '\0') {
+			syslog(priority, "%.*s", (int)sbuf.len, sbuf.c);
+			break;
+		}
+
+		if (c != '\n')
+			smart_string_appendc(&sbuf, c);
+		else {
+			syslog(priority, "%.*s", (int)sbuf.len, sbuf.c);
+			smart_string_reset(&sbuf);
+		}
+	}
+
+	efree(message);
+	smart_string_free(&sbuf);
+}
+
+/* }}} */
+
+/*
+ * Local variables:
+ * tab-width: 4
+ * c-basic-offset: 4
+ * End:
+ * vim600: sw=4 ts=4 fdm=marker
+ * vim<600: sw=4 ts=4
+ */
diff --git a/main/php_syslog.h b/main/php_syslog.h
index 33f52a3..a09f98c 100644
--- a/main/php_syslog.h
+++ b/main/php_syslog.h
@@ -21,6 +21,8 @@
 #ifndef PHP_SYSLOG_H
 #define PHP_SYSLOG_H
 
+#include "php.h"
+
 #ifdef PHP_WIN32
 #include "win32/syslog.h"
 #else
@@ -30,23 +32,8 @@
 #endif
 #endif
 
-/*
- * The SCO OpenServer 5 Development System (not the UDK)
- * defines syslog to std_syslog.
- */
-
-#ifdef syslog
-
-#ifdef HAVE_STD_SYSLOG
-#define php_syslog std_syslog
-#endif
-
-#undef syslog
-
-#endif
-
-#ifndef php_syslog
-#define php_syslog syslog
-#endif
+BEGIN_EXTERN_C()
+PHPAPI void php_syslog(int, const char *format, ...);
+END_EXTERN_C()
 
 #endif
diff --git a/win32/build/config.w32 b/win32/build/config.w32
index 1269c6e..f766e53 100644
--- a/win32/build/config.w32
+++ b/win32/build/config.w32
@@ -237,7 +237,8 @@ ADD_FLAG("CFLAGS_BD_ZEND", "/D ZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
 ADD_SOURCES("main", "main.c snprintf.c spprintf.c getopt.c fopen_wrappers.c \
 	php_scandir.c php_ini.c SAPI.c rfc1867.c php_content_types.c strlcpy.c \
 	strlcat.c mergesort.c reentrancy.c php_variables.c php_ticks.c network.c \
-	php_open_temporary_file.c output.c internal_functions.c php_sprintf.c");
+	php_open_temporary_file.c output.c internal_functions.c php_sprintf.c \
+	php_syslog.c");
 ADD_FLAG("CFLAGS_BD_MAIN", "/D ZEND_ENABLE_STATIC_TSRMLS_CACHE=1");
 ADD_SOURCES("win32", "inet.c fnmatch.c sockets.c");