PHP

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Display Error Messages

By default PHP does not display error messages on screen. Some times you get a blank page when executing PHP scripts. Usually some sort of error has occurred, but this error text will not be displayed as SME Server is configured to not display them. Instead the error messages are reported to the log files of the webserver and the general logfile of the server.

Try to analyze your logfiles: /var/log/httpd/error_log and /var/log/httpd/access_log and perhaps also /var/log/messages.


Warning.png Warning:
It is strongly advised to disable display errors after you have tracked and solved the problem, as the displayed error message might provide information (like filesystem layout) that only should be known to the system administrators and not to users, let alone people with bad intentions.

Enable changes

If you (for debugging purposes for instance) would like to enable it you can do it with the instructions found below:

mkdir -p /etc/e-smith/templates-custom/etc/php.ini
cp /etc/e-smith/templates/etc/php.ini/30ErrorHandling /etc/e-smith/templates-custom/etc/php.ini

After that:

cd /etc/e-smith/templates-custom/etc/php.ini
pico 30ErrorHandling

Modify the second line to read:

display_errors          = On

After that issue the following commands:

expand-template /etc/php.ini

Depending on your server version use the proper command to restart your webbrowser.

SME Server 7 and newer:

sv t httpd-e-smith

older releases:

/etc/rc7.d/S86httpd-e-smith restart


Now access your page again and see what the error is.

Undo Changes

If everything works you remove the 30ErrorHandling file from the /etc/e-smith/templates-custom/etc/php.ini folder and issue the last two lines again:

expand-template /etc/php.ini
/etc/rc7.d/S86httpd-e-smith restart

Open basedir restriction

SME Server has a security measure in place which is called 'open basedir restriction'. This measure prevents PHP from executing or invoking other PHP scripts outside the scope of it's own tree in other words it creates a 'sandbox' or 'jail'. Overall configuration is defined in the php.ini file but you can add an override on a per ibay basis.

Error message

The PHP open basedir restriction usually present to the user like this in the /var/log/messages file:

Aug 12 17:27:42 homer httpd: PHP Warning:  main(): open_basedir restriction in effect. File(/tmp/test.php) is not within the allowed path(s): (/home/e-smith/files/ibays/Primary/html/) in /home/e-smith/files/ibays/Primary/html/test.php on line 2

In general you will find this message in the log files only as by default PHP is configured to prevent the display of error messages to the end users. This can be changed as per this HowTo.

Modifying the PHPBaseDir setting for an ibay

    (Please also see: these instructions on the Useful_Commands page.)
  1. Open a SME Server shell as root user and document the current setting of the PHPBaseDir directive by writing down the output of the following command:
    db accounts getprop ibayname PHPBaseDir 
    

    Be careful to write it down to the letter as we need it in the next step For the Primary ibay the ouptut of above command would normally look like this:

    /home/e-smith/files/ibays/Primary/html/
    
  2. Decide on what directory you would like to add and issue the following:
    db accounts setprop ibayname PHPBaseDir value
    

    Replace ibayname with the name of the ibay and value with the old value for the PHPBaseDir directive you have written down and a colon (:) followed by the full path to the directory you would like to add with a tailing slash (/), e.g.

    db accounts setprop Primary PHPBaseDir /home/e-smith/files/ibays/Primary/html/:/opt/gallery2/
    

    Above command would allow for invocation of scripts in the /opt/gallery2 path from the Primary ibay html folder by PHP.

    To allow uploading of files to via http to a ibay name wiki

    db accounts setprop wiki PHPBaseDir /home/e-smith/files/ibays/wiki/:/tmp/
    
  3. After defining the new setting we need to reflect the change in the configuration file of the web server and have the web server reload it's configuration file. This is done by issuing the following command:
    signal-event ibay-modify ibayname
    

    Be sure to replace ibayname with the name of the ibay you have just modified.

Upload_tmp_dir

upload_tmp_dir

Since SME Server V8, you could have sometime an error is thrown by PHP and you will need to specify a temporary directory (e.g. upload_tmp_dir) which is not set in php.ini. see bugzilla:6650 and bugzilla:7652. Many Php applications needs this setting, most of known are wordpress, roudcube, egroupware, etc. Symptoms are that you can't upload contents to the PHP application.

An easy way is to make a Custom Template to resolve this issue. see Uploadtmpdir

PHP 5

SME 7.x uses PHP 4, upgrading to PHP 5 is not recommended and not supported. However, you can add PHP5 as a cgi-bin handler for any given directory on the webserver with the PHP version 5 contrib.

If you really want to upgrade the entire system to PHP 5 (for instance, if you need the mysqli extension), here's how to do it:

yum --enablerepo=centosplus \
install php.i386 php-pear-Net-Socket php-pear-Auth-SASL \
php-pear-DB php-pear-HTTP php-pear-Mail php-pear-XML-Parser
/sbin/e-smith/signal-event post-upgrade
/sbin/e-smith/signal-event reboot

Horde webmail is confirmed to work under PHP 5, provided you've upgraded to the latest SME version. Please note again that PHP 5 is not officially supported by SME 7.x, and therefore you may run into trouble when upgrading SME (see e.g. http://forums.contribs.org/index.php?topic=38194.0 and http://forums.contribs.org/index.php?topic=39611.0).

See also:

PHP 5 with php-mcrypt

Important.png Note:
For SME Server 8.0 beta 5 only... with php 5.2.10 (default rpms for beta 5)...

You need php-mcrypt for new WEB applications like eGroupWare, Joomla, etc. So see this Howto:

Tested on my SME Server 7.4 upgraded to SME Server 8.0 Beta 5 and works great !

  1. Download php-mcrypt rpms needed
    cd /tmp
    wget http://rpms.famillecollet.com/enterprise/5/olds/i386/php-common-5.2.10-1.el5.remi.i386.rpm
    wget http://rpms.famillecollet.com/enterprise/5/olds/i386/php-mcrypt-5.2.10-1.el5.remi.i386.rpm
    
  2. Make a backup of your current php.ini file' (because the install will change the file)
    cp /etc/php.ini /etc/php.ini.org
    
  3. Remove the default php-common installed from SME Server Beta 5 (conflict with the new rpm)
    rpm -e --nodeps php-common-5.2.10-1.el5.sme
    
  4. Then install the 2 new rpms
    yum localinstall php-common-5.2.10-1.el5.remi.i386.rpm php-mcrypt-5.2.10-1.el5.remi.i386.rpm
    
  5. Backup the new php.ini file created and restore the original
    mv /etc/php.ini /etc/php.ini.old
    mv /etc/php.ini.org /etc/php.ini
    
  6. Restart all services
    svc -t /service/httpd-e-smith
    
  7. Check Apache syntax
    httpd -t
    

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