在Ubuntu-linux操作系统下安装apache-mysql-php（Install Apache MySQL PHP on Ubuntu Linux OS）.pdf

ServerName localhost to the file and save. This can all be done in a single command with the following: $ echo "ServerName localhost" | sudo tee /etc/apache2/conf.d/fqdn Virtual Hosts Apache2 has the concept of sites, which are separate configuration files that Apache2 will read. These are available in /etc/apache2/sites-available. By default, there is one site available called 000-default. This is what you will see when you browse to http://localhost orhttp://127.0.0.1. You can have many different site configurations available, and activate only those that you need. As an example, we want the default site to be /home/user/public_html/. To do this, we must create a new site and then enable it in Apache2. To create a new site: 1. Copy the default website as a starting point. sudo cp /etc/apache2/sites-available/000-default.con f /etc/apache2/sites-available/mysite.conf 2. Edit the new configuration file in a text editor "sudo nano" on the command line or "gksudo gedit", for example:gksudo gedit /etc/apache2/sites-available/mysite.c onf 3. Change the DocumentRoot to point to the new location. For example, /home/user/public_html/ 4. In the file: /etc/apache2/apache2.conf, change the Directory directive, replace <Directory /var/www/> to<Directory /home/user/public _html/> 5. You can also set separate logs for each site. To do this, change the ErrorLog and CustomLog directives. This is optional, but handy if you have many sites 6. Save the file Now, we must deactivate the old site, and activate our new one. Ubuntu provides two small utilities that take care of this: a2ensite (apache2enablesite) and a2dissite (apache2disable site). $ sudo a2dissite 000-default && sudo a2ensite mysite Finally, we restart Apache2: $ sudo /etc/init.d/apache2 restart If you have not created /home/user/public_html/, you will receive an warning message To test the new site, create a file in /home/user/public_html/: $ echo '<b>Hello! It is working!</b>' > /home/user/public_html/index.html Finally, browse to http://localhost/ Installing PHP 5 To only install PHP5. use any method to install the package

libapache2-mod-php5 Enable this module by doing sudo a2enmod php5 which createsa symbolic link /etc/apache2/mods-enabled/php5 pointing to /etc/apache2/mods-availble/php5 Except if you use deprecated PHP code beginning ony byinstead ofphp"(which is highly inadvisable),open,as root,the file /etc/php5/apache2/php.ini,look for the line"short_open_tag= On",change it to"short_open_tag=Off(not including the quotation marks)and add a line of comment(beginning by a semi-colon)giving the reason,the author and the date of this change.This way.if you later want some XML or XHTML file to be served as PHP,will be ignored by PHP instead of being a PHP code mistake Relaunch Apache 2 again: s sudo service apache2 restart Checking PHP 5 installation In /var/www.create a text file called "test php".grant the world (or.at least.Ubuntu user "apache") host/test php"if you deseription of PHF configuration,it proves PHP 5 works with Apache Troubleshooting PHP5 Does your browser ask ifyou want the php file instead of displaying it?If Apache isno actually parsing the php after you restarted it,install libapache2-mod-php5.It is installed when you install the php5 package,but may have been removed inadvertently by packages which need to run a different version of php. Ifsudo a2enmod php5 retumns"S This nodule does not exist!you should purge (not just remove) the libapachemod-php5 package and reinstall it Be sure to clear your browser's cache before testing your site again.To do this in Firefox 4:Edit- Preferences PrivacyHistory:clear your recent historyDetails:choose"Everything"in"Time range to clean"and check only"cache".then click on"Clear now" Remember that.for Apache to be called the URI in your web browser must begin with "http://"If it begins with" the file is read directly by the boser. so you get(X)HTML and CSS,but no PHP.If you didn't configure any host alias or virtual host,then a local URI begins with "http://localhost"."http://127.0.0.1"or http://followed by your IP number If the problem persists,check your PHP file authorisations(it should be readable at least by Ubuntu user"apache").and check if the PHP code is correct.For instance,copy your PHP file,replace your whole PHP file c ()(withou the):if you get the PHPtes page in your web browser,then the problem is in your PHP code,not in Apache or PHP configuratic nor in file permissions.If this doesn't work,then it is a problem of file authorisation,Apache or PHP configuration,cache not emptied,or Apache not runningor not restarted.Use the display of that test file in your web browser to see the list of files influencing PHP behaviour

libapache2-mod-php5 Enable this module by doing $ sudo a2enmod php5 which creates a symbolic link /etc/apache2/mods-enabled/php5 pointing to /etc/apache2/mods-availble/php5 . Except if you use deprecated PHP code beginning only by "<?" instead of "<?php" (which is highly inadvisable), open, as root, the file /etc/php5/apache2/php.ini , look for the line "short_open_tag = On", change it to "short_open_tag = Off" (not including the quotation marks) and add a line of comment (beginning by a semi-colon) giving the reason, the author and the date of this change. This way, if you later want some XML or XHTML file to be served as PHP, the "<?xml" tag will be ignored by PHP instead of being seen as a PHP code mistake. Relaunch Apache 2 again: $ sudo service apache2 restart Checking PHP 5 installation In /var/www , create a text file called "test.php", grant the world (or, at least, Ubuntu user "apache") permission to read it, write in it the only line: "<?php phpinfo(); ?>" (without the quotation marks) then, with your web browser, go to the URI "http://localhost/test.php": if you can see a description of PHP5 configuration, it proves PHP 5 works with Apache. Troubleshooting PHP 5 Does your browser ask if you want to download the php file instead of displaying it? If Apache is not actually parsing the php after you restarted it, install libapache2-mod-php5. It is installed when you install the php5 package, but may have been removed inadvertently by packages which need to run a different version of php. If sudo a2enmod php5 returns "$ This module does not exist!", you should purge (not just remove) the libapache2-mod-php5 package and reinstall it. Be sure to clear your browser's cache before testing your site again. To do this in Firefox 4: Edit → Preferences … Privacy → History: clear your recent history → Details : choose "Everything" in "Time range to clean" and check only "cache", then click on "Clear now". Remember that, for Apache to be called, the URI in your web browser must begin with "http://". If it begins with "file://", then the file is read directly by the browser, without Apache, so you get (X)HTML and CSS, but no PHP. If you didn't configure any host alias or virtual host, then a local URI begins with "http://localhost", "http://127.0.0.1" or http://" followed by your IP number. If the problem persists, check your PHP file authorisations (it should be readable at least by Ubuntu user "apache"), and check if the PHP code is correct. For instance, copy your PHP file, replace your whole PHP file content by "<?php phpinfo(); ?>" (without the quotation marks): if you get the PHP test page in your web browser, then the problem is in your PHP code, not in Apache or PHP configuration nor in file permissions. If this doesn't work, then it is a problem of file authorisation, Apache or PHP configuration, cache not emptied, or Apache not running or not restarted. Use the display of that test file in your web browser to see the list of files influencing PHP behaviour