我如何强制 php-xml 查看已安装的依赖项？
sudo yum install php-xml
抱怨：
php-common = 5.1.6-34.el5_8
但运行yum install php-common
php-common-5.1.6-34.el5_8.i386 already installed
[root@dtsrvishvt2 /]# sudo yum install php-xml
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.manchester.icecolo.com
* extras: mirrors.manchester.icecolo.com
* updates: mirrors.manchester.icecolo.com
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-xml.i386 0:5.1.6-34.el5_8 set to be updated
--> Processing Dependency: php-common = 5.1.6-34.el5_8 for package: php-xml
--> Finished Dependency Resolution
php-xml-5.1.6-34.el5_8.i386 from updates has depsolving problems
--> Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
Error: Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.
[root@dtsrvishvt2 /]# yum install php-common
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: ftp.tudelft.nl
* extras: mirrors.coreix.net
* updates: mirrors.coreix.net
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Package matching php-common-5.1.6-34.el5_8.i386 already installed. Checking for update.
Nothing to do
[root@dtsrvishvt2 /]#
更新
我已尝试建议的清理并重新运行命令。我还yum install php-common再次运行了，首先是因为它是依赖项，然后是yum install php-common。
[root@dtsrvishvt2 /]# package-cleanup --problems
Setting up yum
Reading local RPM database
Processing all local requires
No problems found
[root@dtsrvishvt2 /]# package-cleanup --dupes
Setting up yum
[root@dtsrvishvt2 /]# rpm -Va --nofiles --nodigest
[root@dtsrvishvt2 /]#
更新 2
按照@Janne Pikkarainen 的建议尝试yum clean all但仍然失败（我没有尝试yum clean all但尝试过之前建议的其他方法）
[root@dtsrvishvt2 /]# yum clean all
Loaded plugins: fastestmirror
Cleaning up Everything
Cleaning up list of fastest mirrors
[root@dtsrvishvt2 /]# yum install php-xml
Loaded plugins: fastestmirror
Determining fastest mirrors
* base: centos.mirroring.pulsant.co.uk
* extras: centos.mirroring.pulsant.co.uk
* updates: centos.mirroring.pulsant.co.uk
addons | 1.9 kB 00:00
addons/primary_db | 1.1 kB 00:00
base | 1.1 kB 00:00
base/primary | 967 kB 00:00
base 2725/2725
c5-testing | 1.9 kB 00:00
c5-testing/primary_db | 1.5 MB 00:02
extras | 2.1 kB 00:00
extras/primary_db | 169 kB 00:00
updates | 1.9 kB 00:00
updates/primary_db | 345 kB 00:00
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-xml.i386 0:5.1.6-34.el5_8 set to be updated
--> Processing Dependency: php-common = 5.1.6-34.el5_8 for package: php-xml
--> Finished Dependency Resolution
php-xml-5.1.6-34.el5_8.i386 from updates has depsolving problems
--> Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
Error: Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
[root@dtsrvishvt2 /]#
然后尝试重新运行命令，首先yum install php-xml- 失败，然后也许是依赖项？所以，yum install php-common- 正如我们之前看到的那样已经安装，所以再次yum install php-xml- 仍然失败： -
[root@dtsrvishvt2 /]# yum install php-xml
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirroring.pulsant.co.uk
* extras: centos.mirroring.pulsant.co.uk
* updates: centos.mirroring.pulsant.co.uk
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-xml.i386 0:5.1.6-34.el5_8 set to be updated
--> Processing Dependency: php-common = 5.1.6-34.el5_8 for package: php-xml
--> Finished Dependency Resolution
php-xml-5.1.6-34.el5_8.i386 from updates has depsolving problems
--> Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
Error: Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
[root@dtsrvishvt2 /]# yum install php-common
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirroring.pulsant.co.uk
* extras: centos.mirroring.pulsant.co.uk
* updates: centos.mirroring.pulsant.co.uk
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Package matching php-common-5.1.6-34.el5_8.i386 already installed. Checking for update.
Nothing to do
[root@dtsrvishvt2 /]# yum install php-xml
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: centos.mirroring.pulsant.co.uk
* extras: centos.mirroring.pulsant.co.uk
* updates: centos.mirroring.pulsant.co.uk
Reducing CentOS-5 Testing to included packages only
Finished
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-xml.i386 0:5.1.6-34.el5_8 set to be updated
--> Processing Dependency: php-common = 5.1.6-34.el5_8 for package: php-xml
--> Finished Dependency Resolution
php-xml-5.1.6-34.el5_8.i386 from updates has depsolving problems
--> Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
Error: Missing Dependency: php-common = 5.1.6-34.el5_8 is needed by package php-xml-5.1.6-34.el5_8.i386 (updates)
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
[root@dtsrvishvt2 /]#
更新 3
看起来我拥有的版本php-common-5.2.10-1.el5.centos比作为依赖项所要求的版本要新php-xml，php-common = 5.1.6-34.el5_8
[root@dtsrvishvt2 /]# rpm -qa |grep php
php-ldap-5.2.10-1.el5.centos
php-common-5.2.10-1.el5.centos
php-5.2.10-1.el5.centos
php-mcrypt-5.2.9-2.el5.centos.3
php-pdo-5.2.10-1.el5.centos
php-cli-5.2.10-1.el5.centos
php-mysql-5.2.10-1.el5.centos
[root@dtsrvishvt2 /]#
那么我该如何强制 php-xml 使用我已经拥有的更高版本？
（引发这个问题并在这里单独询问：如何强制 CentOS yum 使用已安装的软件包依赖项的更高版本（php-common 作为 php-xml 的依赖项））
答案1
yum您是否尝试过按照要求运行的命令来修复该情况？
package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest
尝试这些，然后看看是否可以安装php-xml。
编辑：只是为了好玩，运行yum clean all然后尝试重新安装php-xml。
答案2
解决方案是接受的答案：
如何强制 CentOS yum 使用已安装的软件包依赖项的更高版本（php-common 作为 php-xml 的依赖项）
总结一下：迁移到php5.3。
原因：由于安全问题，对 php5.2 的支持已被删除，如另一个问题的已接受答案中所述。此删除导致依赖项的版本不匹配，因此出现错误。
背景
我想在 CentOS 5.4 机器上运行 Drupal 7。所以我需要 5.3 版本的 PHP。
以下是截至 2012 年 5 月 24 日使用工作存储库升级到 PHP 5.3 的完整工作步骤（我提供了以 # 开头的注释 - 您不需要这些，仅供您参考）
# Comment: sites like http://www.computingunplugged.com/issues/issue201102/00002619001
# provide a good start for remedying the problem whereby we need 5.3 on CentOS 5.4 to run Drupal 7. But although their packages worked at the time, the links are now outdated, and updates to these are below.
# comment: (as of May 2012 - the following work, the reason for failures was use of 1) older packages no longer on the server and 2) change of address of one of the servers to dl.fedoraproject.org/pub/epel (credit to: http://osdir.com/ml/centos/2012-03/msg00057.html )
rpm -Uhv http://apt.sw.be/redhat/el5/en/i386/rpmforge/RPMS/rpmforge-release-0.3.6-1.el5.rf.i386.rpm
rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm
rpm -Uvh http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/i386/ius-release-1.0-10.ius.el5.noarch.rpm
yum erase php php-pear php-mysql php-cli php-common
yum install php53u php53u-pear php53u-cli php53u-common php53u-gd
yum install php53u-mbstring php53u-mcrypt php53u-mysql php53u-soap
yum install php53u-xml php53u-xmlrpc php53u-bcmath
# After doing the above, php -v shows 5.3.x But on attempting to install Drupal 7 you may get complaint of something "Your PHP installation is too old 5.1.6 Drupal requires at least PHP 5.2.4. See the system requirements page for more information." and php.info shows the same
# The remedy is to simply restart your apache server
service httpd restart
# credit to following for suggesting service httpd restart :-
# https://serverfault.com/a/207806/29205
# https://serverfault.com/questions/207762/centos-updating-php-via-yum-doesnt-change-the-version-apache-uses
# Drupal 7 install on CentOS 5.4 worked after applying the above steps
# If your MySQL server is not running (check by ps -ef | grep mysql ) then you can run:
/etc/init.d/mysqld
# ...to start it, and to make sure it starts when the machine is restarted or cold booted:
chkconfig mysqld on