See https://groups.google.com/a/chromium.org/forum/#!topic/chromium-reviews/AXhZapYuHi8

diff -u -r ../php-5.6.16/ext/standard/php_fopen_wrapper.c ./ext/standard/php_fopen_wrapper.c
--- ../php-5.6.16/ext/standard/php_fopen_wrapper.c	2015-11-25 15:28:38.000000000 -0500
+++ ./ext/standard/php_fopen_wrapper.c	2016-01-04 06:42:57.421589363 -0500
@@ -312,7 +312,7 @@
 		}
 
 #if HAVE_UNISTD_H
-		dtablesize = getdtablesize();
+		dtablesize = sysconf(_SC_OPEN_MAX);
 #else
 		dtablesize = INT_MAX;
 #endif
