Call to undefined function xml_parser_create()

Question

Could you please help me in resolving this conflict. I am tryin to run a xml_parse_create.
My server configurations:
[root@server ~]# php -v
PHP 7.0.22 (cli) (built: Aug 7 2017 16:18:27) ( NTS )

[root@server ~]# nginx -v
nginx version: nginx/1.10.2

OS: CentOS 7.3.1611 (Core)

Details of my YUM installation:

[root@server ~]# yum list installed | grep php
php70u-cli.x86_64                       7.0.22-2.ius.centos7           @ius     
php70u-common.x86_64                    7.0.22-2.ius.centos7           @ius     
php70u-fpm.x86_64                       7.0.22-2.ius.centos7           @ius     
php70u-fpm-nginx.noarch                 7.0.22-2.ius.centos7           @ius     
php70u-mysqlnd.x86_64                   7.0.22-2.ius.centos7           @ius     
php70u-pdo.x86_64                       7.0.22-2.ius.centos7           @ius  

Here is the details of the investigation:

I tried executing following code in test.php:

<?php
$xml_parser = xml_parser_create("");
print $xml_parser;<br>
?>

[root@server ~]# php /tmp/test.php
PHP Fatal error: Uncaught Error: Call to undefined function

[root@server ~]# sudo yum install php-xml
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: repo1.ash.innoscale.net
* epel: fedora-epel.mirrors.tds.net
* extras: mirror.es.its.nyu.edu
* ius: ius.mirror.constant.com
* remi-safe: repo1.ash.innoscale.net
* updates: mirrors.advancedhosters.com
* webtatic: us-east.repo.webtatic.com
Resolving Dependencies
--> Running transaction check
---> Package php-xml.x86_64 0:5.4.16-42.el7 will be installed
--> Processing Dependency: php-common(x86-64) = 5.4.16-42.el7 for package: php-xml-5.4.16-42.el7.x86_64
--> Running transaction check
---> Package php-common.x86_64 0:5.4.16-42.el7 will be installed
--> Processing Conflict: php70u-common-7.0.22-2.ius.centos7.x86_64 conflicts php-common < 7.0.22
--> Finished Dependency Resolution
Error: php70u-common conflicts with php-common-5.4.16-42.el7.x86_64
You could try using --skip-broken to work around the problem
You could try running: rpm -Va --nofiles --nodigest

Solution 1

Under ubuntu you can do the same as @Tarun pointed

apt-get install php-xml
apt-get search php |grep xml

Solution 2

You need to remove php-xml and use php70u-xml

yum purge php-xml; yum install -y php70u-xml

Many people install php using some tutorial which will enable an external repo. Php gets installed using packages from this external repo. While installing extensions they try and use package names from default repo. So that is what your problem was.

Always first see where your packages are installed from

yum list installed | grep php

Then always make sure you that you choose the package which belongs to the same repo

yum search php | grep xml