php - 无法启用 php 作为 apache2 模块

Question

在 Ubuntu 服务器设置过程中，我到了需要启用 php 作为 apache2 模块的地步。我尝试运行 sudo a2enmod php5，但它返回了 ERROR: Module php5 does not exist!

经过一些搜索，我偶然发现了 gerard 的这个提示:

如果 sudo a2enmod php5 返回“$ This module does not exist!”，您应该清除(不仅仅是删除)libapache2-mod-php5 包并重新安装它。在再次测试您的网站之前，请务必清除浏览器的缓存。”

运行 sudo apt-get --purge remove libapache2-mod-php5 然而，返回 Package libapache2-mod-php5 is not installed, so not removed 。当然，我尝试使用 sudo apt-get install libapache2-mod-php5 安装它，但后来我得到:

    Some packages could not be installed. This may mean that you have
    requested an impossible situation or if you are using the unstable
    distribution that some required packages have not yet been created
    or been moved out of Incoming.
    The following information may help to resolve the situation:

    The following packages have unmet dependencies.
    libapache2-mod-php5 : Depends: libxml2 (>= 2.8.0) but 2.7.8.dfsg-5.1ubuntu4.6 is to be installed
    Recommends: php5-cli but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.

我尝试更新 && upgrade 以希望 libxml2 得到更新，但没有发生。我也尝试安装 php5-cli，但得到了:

    The following packages have unmet dependencies.
    php5-cli : Depends: libxml2 (>= 2.8.0) but 2.7.8.dfsg-5.1ubuntu4.6 is to be installed
               Depends: libedit2 (>= 2.11-20080614-4) but 2.11-20080614-3ubuntu2 is to be installed
    E: Unable to correct problems, you have held broken packages.

此时我迷路了。运行 php -v，表明 php 正在运行，但是:

    PHP 5.4.17 (cli) (built: Aug  7 2013 11:40:38) 
    Copyright (c) 1997-2013 The PHP Group
    Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies

Answer 1

您无法在 Ubuntu 12.04 下安装 PHP 5.4.17，因为所需的 libxml2 库 >= v2.8.0 仅在 Ubuntu 12.10 (Quantal quetzal) 或更高版本中可用。解决方案:获取更新版本的 Ubuntu。