Using PHP to view syslog in private web page Post: 303036827

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Top Forums UNIX for Beginners Questions & Answers Using PHP to view syslog in private web page Post 303036827 by Neo on Friday 12th of July 2019 11:15:26 PM

07-13-2019

Administrator

Generally in PHP you are better off with a simple shell_exec() command and then process the results in PHP.

For example, from the above code, you could do this:

Code:

<?php
$command = "tail -n 11 /var/log/_gateway-syslog.log");
$raw_output = shell_exec($command);
$output = process_output($raw_output):
echo "<pre>$output</pre>";

function  process_output($text)
{
  // do your text processing here instead of using a shell command pipeline in shell_exec()
 return $processed_text;
}

PHP has rich tools for text processing including regular expressions.

I written these types of PHP files to display unix / linux system information countless times, and I always process the text in PHP without exception.

In general, I find it best to decouple the "shell exec" type of commands from PHP as much as possible for a number of reasons, including system security, integrity and long-term system maintenance.

For a real-world example on this web site, we use shell_exec() to begin processing all the man pages in our man page repository; but the shell_exec() only returns the raw output from the man command. Then the PHP script extensively processes the raw man page output, adding links, formatting, html entities, css information, etc. There is a significant amount of text processing done in PHP, but the PHP shell_exec() command to get the man page from the Linux filesystem and output for processing is very basic / simple.

Neo

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php-config

php-config(1)                                                   Scripting Language                                                   php-config(1)

NAME

       php-config - get information about PHP configuration and compile options

SYNOPSIS

       php-config [options]

DESCRIPTION

       php-config is a simple shell script for obtaining information about installed PHP configuration.

OPTIONS

       --prefix       Directory prefix where PHP is installed, e.g. /usr/local
       --includes     List of -I options with all include files
       --ldflags      LD Flags which PHP was compiled with
       --libs         Extra libraries which PHP was compiled with
       --man-dir      The directory prefix where the manpages is installed
       --extension-dir
                      Directory where extensions are searched by default
       --include-dir  Directory prefix where header files are installed by default
       --php-binary   Full path to php CLI or CGI binary
       --php-sapis    Show all SAPI modules installed on the Debian system
       --configure-options
                      Configure options to recreate configuration of current PHP installation
       --version      PHP version
       --vernum       PHP version as integer

SEE ALSO

       php(1)

VERSION INFORMATION

       This manpage describes php, version 7.0.33-6+ubuntu18.04.1+deb.sury.org+3.

COPYRIGHT

       Copyright (C) 1997-2017 The PHP Group

       This  source  file  is  subject to version 3.01 of the PHP license, that is bundled with this package in the file LICENSE, and is available
       through the world-wide-web at the following url:
       http://www.php.net/license/3_01.txt

       If you did not receive a copy of the PHP license and  are  unable  to  obtain  it  through  the  world-wide-web,  please  send  a  note  to
       license@php.net so we can mail you a copy immediately.

The PHP Group                                                          2017                                                          php-config(1)