Title: Undefined constant LIBXML
Last modified: December 13, 2017
---
# Undefined constant LIBXML
* Resolved [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/)
* Hi
* I need help to get rid of this warning in my WP 4.9.1 (German) with BackWPup
3.4.4 protocol that was suddenly there:
* Prüfe WP-Export-Datei …
Use of undefined constant LIBXML_PARSEHUGE – assumed‘
LIBXML_PARSEHUGE’ WARNUNG: DOMDocument::loadXML() expects parameter 2 to be long,
string given
* Thanks for a hint
Martin
Viewing 13 replies - 1 through 13 (of 13 total)
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9778950)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/)
Please try to
untick on **XML Export** in your job setting and then try again. I think you
have some problem with XML export function! Hope that helps 😉
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9778966)
* No, I don’t.
If I directly export wordpress xml file I don’t have any error
messages. Or is do I have do turn on some debug options in wordpress?
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9778997)
* But you are right: when I untick “WordPress-XML-Export” I don’t have any warnings.
And when I don’t backup anything I don’t have any warning at all 😉
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9779135)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/),
BackWPUp requires
libxml 2.7.0 for XML export function to run correctly, so for now, please untick
XML Export function from your job setting.
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9779446)
* Ok, thanks.
And where is this libxml 2.7.0 coming from? – WordPress update? –
BackWPup update? – Any other modul update?
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9779504)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/)
What is your
PHP version?
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9779637)
* [INFO] BackWPup 3.4.4; Ein Projekt der Inpsyde GmbH
[INFO] WordPress 4.9.1 auf…[
INFO] PHP-Version: 5.5.19 (64bit); cgi-fcgi; Linux [INFO] Maximale PHP-Skript-
Ausführungszeit ist 240 Sekunden [INFO] Skript-Neustart-Zeit ist auf 180 Sekunden
festgelegt [INFO] MySQL-Version: 5.6.36 [INFO] Webserver: Apache [INFO] curl-
Version: 7.48.0; OpenSSL/1.0.1u
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 5 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9779722)
* Here the (reduced and de-personalized) html log file of BackWPup:
*
BackWPup-
Protokoll für Backup 1 von 13. Dezember 2017 am 14:52 [INFO]
BackWPup 3.4.4; Ein Projekt der Inpsyde GmbH
[INFO] WordPress 4.9.1 auf
[http://franziska-baumgartner.ch/[
INFO] Log-Level: Debug (übersetzt)
[INFO] BackWPup-Auftrag: Backup 1; DBDUMP
+FILE+WPEXP+WPPLUGIN
[INFO] Läuft mit Benutzer: (0)
[INFO] BackWPup
kein automatischer Auftragsstart konfiguriert
[INFO] BackWPup-Auftrag wurde
manuell gestartet
[INFO] PHP-Version: 5.5.19 (64bit); cgi-fcgi; Linux
[INFO] Maximale PHP-Skript-Ausführungszeit ist 240 Sekunden
[INFO] Skript-
Neustart-Zeit ist auf 180 Sekunden festgelegt
[INFO] MySQL-Version: 5.6.36
[INFO] Webserver: Apache
[INFO] curl-Version: 7.48.0; OpenSSL/1.0.1u
…..
[INFO] Backup-Datei ist: ….
[13-Dec-2017 14:52:
31] 1. Versuche, die Datenbank zu sichern …
[13-Dec-2017
14:52:31] Mit Datenbank fraa auf localhost verbunden
[13-Dec-2017
14:52:31] Sichere Datenbank-Tabelle „wp_….“ mit „0“ Einträgen
[
13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“ mit „0“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „0“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_f….“
mit „297“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „370“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „92“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „26“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „6“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „0“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „6“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „54“ Einträgen
[13-Dec-2017 14:52:31] Sichere Datenbank-Tabelle „wp_….“
mit „2“ Einträgen
[13-Dec-2017 14:52:31] Datenbank-Backup „fraa.sql“ mit
969,66 KB zur Backup-Datei-Liste hinzugefügt
[13-Dec-2017 14:52:
31] Datenbank-Backup fertig!
[13-Dec-2017 14:52:31] 1.
Versuche, eine Liste der Verzeichnisse für das Backup zu erstellen …
[13-Dec-
2017 14:52:32] „wp-config.php“ zur Backup-Datei-Liste hinzugefügt.
[13-Dec-2017 14:52:32] 455 Verzeichnisse zu sichern.
[13-
Dec-2017 14:52:32] 1. Versuche, einen WordPress-Export als XML-Datei zu
erstellen …
[13-Dec-2017 14:52:33] Prüfe WP-Export-Datei …
<
span datetime=”2017-12-13T13:52:33+00:00″ title=”[Type: 8|Line: 411|File: /wp-
content/plugins/backwpup/inc/class-jobtype-wpexp.php|Mem: 36,75 MB|Mem Max: 36,75
MB|Mem Limit: 256M|PID: 12948 | UniqID: 5a31309fd367f7.73445229|Queries: 346]”
>[13-Dec-2017 14:52:33] Use of undefined constant LIBXML_PARSEHUGE – assumed'
LIBXML_PARSEHUGE'
[13-Dec-2017 14:52:33] WARNUNG: DOMDocument::loadXML() expects parameter
2 to be long, string given
[13-Dec-2017 14:52:33] XML-Export „Franziska_Baumgartner.wordpress.2017-12-13.xml“ mit 168,67 KB zur
Backup-Datei-Liste hinzugefügt
[13-Dec-2017 14:52:33] 1. Versuche,
eine Liste der installierten Plugins zu erstellen …
[13-Dec-2017
14:52:33] Die Datei mit der Plugin-Liste „Franziska-Baumgartner.pluginlist.
2017-12-13.txt“ mit 1,67 KB zur Backup-Datei-Liste hinzugefügt.
[13-Dec-2017
14:52:33] 1. Versuche, eine Manifest-Datei zu generieren …
[13-Dec-
2017 14:52:33] Die Datei manifest.json mit 5,33 KB wurde zur Backup-Datei-
Liste hinzugefügt.
[13-Dec-2017 14:52:33] 1. Versuche, Backup zu erstellen…
[13-Dec-2017 14:52:33] Komprimiere Dateien als ZipArchive. Bitte
habe einen Moment Geduld.
[13-Dec-2017 14:52:33] Extra-Dateien zum Archiv hinzufügen
[13-Dec-2017 14:52:33] Archiviere Verzeichnis: …….
[13-Dec-2017
14:52:33] Archiviere Verzeichnis: /home/www/……/
* [
13-Dec-2017 14:52:46] Backup wurde erstellt.
[13-Dec-2017 14:52:46]
Archivgröße ist 57,17 MB
[13-Dec-2017 14:52:46] 3047 Dateien
mit 85,09 MB im Archiv.
[13-Dec-2017 14:52:46] Neustart nach 15 Sekunden.
[
13-Dec-2017 14:52:47] Eine alte Log-Datei gelöscht
[13-Dec-2017 14:52:47] WARNUNG:
Job mit Warnungen beendet in 16 Sekunden. Um eine korrekte Ausführung zu gewährleisten,
behebe bitte die Fehler.
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9782072)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/)
Please show us
your server configuration by go to BackWPUp -> Settings -> Infomation -> and
press “Get debug info” And I need you go to BackWPUp -> Settings -> Logs -> Logging
Level -> Debug(not translated ) if you not already set, re-run it again and send
us debug log. You can get backup log at : BackWpUp -> Logs
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9782335)
* Protocol:
* [INFO] BackWPup 3.4.4; A project of Inpsyde GmbH
[INFO] WordPress 4.9.1 on [http://franziska-…](http://franziska-…);[
INFO] Log Level: Debug [INFO] BackWPup job: Backup 1; DBDUMP+FILE+WPEXP+WPPLUGIN[
INFO] Runs with user: (0) [INFO] BackWPup no automatic job start configured [
INFO] BackWPup job started manually [INFO] PHP ver.: 5.6.19 (64bit); cgi-fcgi;
Linux [INFO] Maximum PHP script execution time is 120 seconds [INFO] Script restart
time is configured to 180 seconds [INFO] MySQL ver.: 5.6.36 [INFO] Web Server:
Apache [INFO] curl ver.: 7.48.0; OpenSSL/1.0.1u [INFO] Temp folder is: /home/
www/…/wp-content/uploads/backwpup-1c2766-temp/ [INFO] Logfile is: /home/www/…/
wp-content/uploads/backwpup-1c2766-logs/backwpup_log_1c2766_2017-12-14_14-33-
32.html [INFO] Backup file is: /home/www/…/wp-content/uploads/backwpup-1c2766-
backups/backwpup_U4OCOZSZ01_fraa_2017-12-14_14-33-32.zip [14-Dec-2017 14:33:32]
1. Try to backup database … [14-Dec-2017 14:33:32] Connected to database fraa
on localhost [14-Dec-2017 14:33:32] Backup database table “wp_fraa1commentmeta”
with “0” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1comments”
with “0” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1links”
with “0” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1options”
with “301” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1postmeta”
with “371” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1posts”
with “93” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1term_relationships”
with “26” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1term_taxonomy”
with “6” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1termmeta”
with “0” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1terms”
with “6” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1usermeta”
with “54” records [14-Dec-2017 14:33:32] Backup database table “wp_fraa1users”
with “2” records [14-Dec-2017 14:33:32] Added database dump “fraa.sql” with 977,00
KB to backup file list [14-Dec-2017 14:33:32] Database backup done! [14-Dec-2017
14:33:32] 1. Trying to make a list of folders to back up … [14-Dec-2017 14:33:
33] Added “wp-config.php” to backup file list [14-Dec-2017 14:33:33] 455 folders
to backup. [14-Dec-2017 14:33:33] 1. Trying to create a WordPress export to XML
file … [14-Dec-2017 14:33:33] Check WP Export file … [14-Dec-2017 14:33:33] Use
of undefined constant LIBXML_PARSEHUGE – assumed ‘LIBXML_PARSEHUGE’ [14-Dec-2017
14:33:33] WARNING: DOMDocument::loadXML() expects parameter 2 to be long, string
given [14-Dec-2017 14:33:33] Added XML export “Franziska_Baumgartner.wordpress.
2017-12-14.xml” with 168,67 KB to backup file list. [14-Dec-2017 14:33:33] 1.
Trying to generate a file with installed plugin names … [14-Dec-2017 14:33:33]
Added plugin list file “Franziska-Baumgartner.pluginlist.2017-12-14.txt” with
1,68 KB to backup file list. [14-Dec-2017 14:33:33] 1. Trying to generate a manifest
file … [14-Dec-2017 14:33:33] Added manifest.json file with 5,26 KB to backup
file list. [14-Dec-2017 14:33:33] 1. Trying to create backup archive … [14-Dec-
2017 14:33:33] Compressing files as ZipArchive. Please be patient, this may take
a moment. [14-Dec-2017 14:33:33] Adding Extra files to Archive [14-Dec-2017 14:
33:33] Archiving Folder: /home/www/…/ [14-Dec-2017 14:33:33] Archiving Folder:/
home/www/…/wp-admin/ [14-Dec-2017 14:33:33] Archiving Folder: /home/www/…/wp-
admin/css/ … … [14-Dec-2017 14:33:36] Archiving Folder: /home/www/…/wp-content/
uploads/cache/2015/ [14-Dec-2017 14:33:36] Archiving Folder: /home/www/…/wp-content/
uploads/cache/2015/05/ … … [14-Dec-2017 14:33:36] Archiving Folder: /home/www/…/
wp-includes/theme-compat/ [14-Dec-2017 14:33:38] Archiving Folder: /home/www/…/
wp-includes/widgets/ [14-Dec-2017 14:33:39] Backup archive created. [14-Dec-2017
14:33:39] Archive size is 48,53 MB. [14-Dec-2017 14:33:39] 3045 Files with 76,30
MB in Archive. [14-Dec-2017 14:33:39] Restart after 7 seconds. [14-Dec-2017 14:
33:39] WARNING: Job finished with warnings in 7 seconds. Please resolve them
for correct execution.
- This reply was modified 8 years, 4 months ago by [baumaeschi](https://wordpress.org/support/users/baumaeschi/).
* Thread Starter [baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* (@baumaeschi)
* [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9782336)
* Debug Info:
* WordPress-Version: 4.9.1
BackWPup-Version: 3.4.4 PHP-Version: 5.6.19 (64bit)
MySQL-Version: 5.6.36 cURL-Version: 7.48.0 cURL-SSL-Version: OpenSSL/1.0.1u WP-
Cron-URL:: [http://franziska…](http://franziska…);./wp-cron.php Verbindung
zum Server selbst:: Response-Test OK Document root: /home/www/… Temp-Verzeichnis::/
home/www/…/wp-content/uploads/backwpup-1c2766-temp/ Protokoll-Verzeichnis:: /
home/www/…/wp-content/uploads/backwpup-1c2766-logs/ Server: Apache Betriebssystem:
Linux PHP-SAPI: cgi-fcgi Aktueller PHP-User: web… Maximale Skript-Laufzeit: 120
Sekunden Alternative WP Cron: Aus WP Cron abgeschaltet: Aus Verzeichnis-Rechte:
0755 Server-Zeit: 13:40 Zeit der Website: 14:40 Zeitzone der Website: Europe/
Berlin Zeitverschiebung der Website: 1 Stunden Sprache der Website: de-DE Zeichensatz
des MySQL-Clients: utf8 PHP-Memory-Limit: 256M WordPress-Memory-Limit: 40M Maximales
WordPress-Memory-Limit: 256M Benutzter Speicher: 40,25 MB Deaktivierte PHP-Funktionen::
apache_get_modules, apache_get_version, apache_getenv, apache_note, apache_setenv,
define_syslog_variables, ini_alter, link, openlog, passthru, pfsockopen, posix_getpwuid,
posix_kill, posix_mkfifo, posix_setpgid, posix_setsid, posix_setuid, posix_uname,
proc_close, proc_get_status, proc_nice, proc_open, proc_terminate, shell_exec,
show_source, syslog, system, virtual Geladene PHP-Erweiterungen:: Core, PDO,
Phar, Reflection, SPL, SimpleXML, SourceGuardian, Zend Guard Loader, bcmath,
bz2, calendar, cgi-fcgi, ctype, curl, date, dba, dom, ereg, exif, fileinfo, filter,
ftp, gd, geoip, gettext, hash, iconv, imagick, imap, intl, ionCube Loader, json,
libxml, mbstring, mcrypt, mhash, mysql, mysqli, mysqlnd, openssl, pcntl, pcre,
pdo_mysql, pdo_sqlite, posix, readline, session, shmop, soap, sockets, sqlite3,
standard, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlrpc,
xmlwriter, xsl, zip, zlib
- This reply was modified 8 years, 4 months ago by [baumaeschi](https://wordpress.org/support/users/baumaeschi/).
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9785154)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/)
libxml 2.7.0
with LIBXML_PARSEHUGE bundled in PHP version 5.3 ([http://php.net/manual/en/libxml.constants.php](http://php.net/manual/en/libxml.constants.php)),
but in your case, you have already 5.5 and that constant still missing, weird
thing in here, so, please contact your hosting provider and ask them about why
you get this error. Or for a workaround like I said before, untick XML Export
🙁
* [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* (@duongcuong96)
* [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9806694)
* [@baumaeschi](https://wordpress.org/support/users/baumaeschi/)
* since we haven’t heard back from you, I’m going to mark it as resolved.
If you’re
still having problems, feel free to let us know ;),
* Btw, If you find BackWPUp is useful for you, we would really appreciate if you
leave a positive review and rating.
This would encourage us to develop new free
features and provide free support 😀 [https://wordpress.org/support/plugin/backwpup/reviews/](https://wordpress.org/support/plugin/backwpup/reviews/)
Viewing 13 replies - 1 through 13 (of 13 total)
The topic ‘Undefined constant LIBXML’ is closed to new replies.
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* 13 replies
* 2 participants
* Last reply from: [happyAnt](https://wordpress.org/support/users/duongcuong96/)
* Last activity: [8 years, 4 months ago](https://wordpress.org/support/topic/undefined-constant-libxml/#post-9806694)
* Status: resolved