/usr/include/php5/ext/standard/ is in php5-dev 5.3.10-1ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/php5/ext/standard/base64.h
/usr/include/php5/ext/standard/basic_functions.h
/usr/include/php5/ext/standard/crc32.h
/usr/include/php5/ext/standard/credits.h
/usr/include/php5/ext/standard/credits_ext.h
/usr/include/php5/ext/standard/credits_sapi.h
/usr/include/php5/ext/standard/crypt_blowfish.h
/usr/include/php5/ext/standard/crypt_freesec.h
/usr/include/php5/ext/standard/css.h
/usr/include/php5/ext/standard/cyr_convert.h
/usr/include/php5/ext/standard/datetime.h
/usr/include/php5/ext/standard/dl.h
/usr/include/php5/ext/standard/exec.h
/usr/include/php5/ext/standard/file.h
/usr/include/php5/ext/standard/flock_compat.h
/usr/include/php5/ext/standard/fsock.h
/usr/include/php5/ext/standard/head.h
/usr/include/php5/ext/standard/html.h
/usr/include/php5/ext/standard/info.h
/usr/include/php5/ext/standard/md5.h
/usr/include/php5/ext/standard/microtime.h
/usr/include/php5/ext/standard/pack.h
/usr/include/php5/ext/standard/pageinfo.h
/usr/include/php5/ext/standard/php_array.h
/usr/include/php5/ext/standard/php_assert.h
/usr/include/php5/ext/standard/php_browscap.h
/usr/include/php5/ext/standard/php_crypt.h
/usr/include/php5/ext/standard/php_crypt_r.h
/usr/include/php5/ext/standard/php_dir.h
/usr/include/php5/ext/standard/php_dns.h
/usr/include/php5/ext/standard/php_ext_syslog.h
/usr/include/php5/ext/standard/php_filestat.h
/usr/include/php5/ext/standard/php_fopen_wrappers.h
/usr/include/php5/ext/standard/php_ftok.h
/usr/include/php5/ext/standard/php_http.h
/usr/include/php5/ext/standard/php_image.h
/usr/include/php5/ext/standard/php_incomplete_class.h
/usr/include/php5/ext/standard/php_iptc.h
/usr/include/php5/ext/standard/php_lcg.h
/usr/include/php5/ext/standard/php_link.h
/usr/include/php5/ext/standard/php_mail.h
/usr/include/php5/ext/standard/php_math.h
/usr/include/php5/ext/standard/php_metaphone.h
/usr/include/php5/ext/standard/php_rand.h
/usr/include/php5/ext/standard/php_smart_str.h
/usr/include/php5/ext/standard/php_smart_str_public.h
/usr/include/php5/ext/standard/php_standard.h
/usr/include/php5/ext/standard/php_string.h
/usr/include/php5/ext/standard/php_type.h
/usr/include/php5/ext/standard/php_uuencode.h
/usr/include/php5/ext/standard/php_var.h
/usr/include/php5/ext/standard/php_versioning.h
/usr/include/php5/ext/standard/proc_open.h
/usr/include/php5/ext/standard/quot_print.h
/usr/include/php5/ext/standard/scanf.h
/usr/include/php5/ext/standard/sha1.h
/usr/include/php5/ext/standard/streamsfuncs.h
/usr/include/php5/ext/standard/uniqid.h
/usr/include/php5/ext/standard/url.h
/usr/include/php5/ext/standard/url_scanner_ex.h
/usr/include/php5/ext/standard/winver.h