Appion

h1. Install the MRC PHP Extension

MRC Tools is installed as a php extension and is required for displaying mrc files live on the web browser.

h2. Make sure you have installed the prerequisite packages

You may find installation information for the following packages under [[Install Web Server Prerequisites]].

h3. php-devel

You can check whether php-devel is installed by typing:

<pre>phpize</pre>

Do not worry about any error message as long as the command is found.

h3. php-GD/FFTW3-devel

Make sure that php-GD and FFTW 3 devel libraries are installed.

*TODO:* provide a screenshot of info.php when correctly installed.

*Note:*

MRCtools are compiled and added to php extension with php-devel package. MRCtools use GD and FFTW3 that need to be compiled from their development libraries while the extension is compiled. If GD and FFTW3 sources were downloaded and compiled directly on your computer, these development files are included. If (as in most cases) GD and FFTW3 are installed from rpm, they are not included. An error message will appear when you attempt to compile mrctools. In this case, you will need separate download and installation of GD-devel and FFTW3-devel. Search http://rpmfind.net/linux/rpm2html/ for GD-devel and FFTW3-devel for the rpm distribution needed for your system. More information on the gd library can be found "here":http://www.php.net/manual/en/image.requirements.php. If you find that you can only view images as png instead of jpg, it may be that you do not have gd _jpeg_ support installed.

h2. MRC Tools Installation

h3. Go to the myami/programs/php_mrc directory

h3. Compile and install the MRC module

<pre>

phpize

./configure 

make

sudo make install

</pre>

h3. Check that the mrc.so module exists in your php module directory 

(e.g., @/usr/lib64/php/modules@ on 64bit CentOS/RHEL/Fedora). If you are unsure where the php module directory is, use http://localhost/info.php to find it under *extension_dir*.

<pre>

ls /usr/lib64/php/modules

  mrc.so

</pre>

For Suse

<pre>

ls /usr/lib64/php5/extensions

  mrc.so

</pre>

h3. Edit your php configuration file, @php.ini@.

If your linux distro does not have a /etc/php.d/ or /etc/php.d/conf.d/ directory where other .ini files reside, you may need to follow the alternate instructions below titled: _Alternative approach if mrc module does not show up in info.php output_.

* Confirm the location of "additional .ini files parsed" from the info.php web page (/etc/php.d in this example)

and create a file called  "mrc.ini" in this directory. This may be done with the following series of commands:

<pre>

cd /etc/php.d

sudo touch /etc/php.d/mrc.ini

sudo chmod 666 mrc.ini

echo "; Enable mrc extension module" > mrc.ini

echo "extension=mrc.so" >> mrc.ini

sudo chmod 444 mrc.ini

cat mrc.ini

</pre>

*OR*

* Add the "mrc.so" extension to the end of the *extension section*

<pre>

extension=mrc.so

</pre>

h3. Restart your webserver

Example commands:

<pre>

#SuSe

/etc/init.d/apache2 restart 

#CentOS

sudo /sbin/service httpd restart 

</pre>

bq. *Note:* Sometimes, the MRC module will not work even after restarting the webserver. Try restarting the whole computer @sudo reboot@.

h3. Verify the mrc tools installation

Visit or refresh http://yourhost/info.php which you created earlier. It should have a section looking like this (The version should correspond to what you've just installed):

!http://emg.nysbc.org/software/leginon/images/images/phpmrc.png!

If mrc is not listed, the extension did not get added in the right order.

h3. Alternative approach if mrc module does not show up in info.php output

1. find in the info.php web page the location of "additional .ini files parsed" in the first table (such as /etc/php.d/conf.d/*).

2. Go to the directory and make a copy of any ini file to use as a template for mrc.ini

<pre>

      >cd [additional_ini_directory]

      >cp gd.ini mrc.ini

</pre>

3. Edit mrc.ini to the following

<pre>

      ; comment out next line to disable mrc extension in php

      extension=mrc.so

</pre>

4. Comment out mrc extension from php.ini (found in /etc/php.ini/ on a typical PHP installation)

<pre>

      ;extension=mrc.so

</pre>

5. Restart your webserver

<pre>

      > /etc/init.d/httpd restart

</pre>

h4. Test the MRC module installation

In the myami/php_mrc (or myami/programs/php_mrc if installing from trunk) directory, you will find two test scripts, "ex1.php" and "ex2.php" and a test MRC image "mymrc.mrc". 

Copy them to your top level web directory (for example on CentOS: /var/www/html/):

<pre>

cp ex1.php ex2.php mymrc.mrc /var/www/html/

</pre>

Run the scripts with the following commands and visit the corresponding pages from the web server:

The expected results are shown below. If you get the same images, you've installed the extension properly.

Note:  the "display" command is part of the ImageMagick package, which you may have to install.

web server: http://localhost/ex1.php

<pre>

php -q ex1.php | display

</pre>

* gd module test result:

!http://emg.nysbc.org/attachments/57/ex1.php.png!

web server: http://localhost/ex2.php

<pre>

php -q ex2.php | display

</pre>

* fftw module test result:

!http://emg.nysbc.org/attachments/58/ex2.php.png!

Test files work but images not showing up in the ImageViewers?

[[appion:Troubleshooting Notes|Here's one way this was fixed.]]

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