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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LEARN ABOUT PHP

php_strip_whitespace

PHP_STRIP_WHITESPACE(3) 						 1						   PHP_STRIP_WHITESPACE(3)

php_strip_whitespace - Return source with stripped comments and whitespace

SYNOPSIS

       string php_strip_whitespace (string  $filename)

DESCRIPTION

	Returns the PHP source code in $filename with PHP comments and whitespace removed. This may be useful for determining the amount of actual
       code in your scripts compared with the amount of comments. This is similar to using php -w from the commandline.

PARAMETERS

	      o $filename
		- Path to the PHP file.

RETURN VALUES

	The stripped source code will be returned on success, or an empty string on failure.

       Note

	       This function works as described as of PHP 5.0.1. Before this it would only return an empty string. For more  information  on  this
	      bug and its prior behavior, see bug report #29606.

EXAMPLES

       Example #1

	      php_strip_whitespace(3) example

	      <?php
	      // PHP comment here

	      /*
	       * Another PHP comment
	       */

	      echo	  php_strip_whitespace(__FILE__);
	      // Newlines are considered whitespace, and are removed too:
	      do_nothing();
	      ?>

	      The above example will output:

	      <?php
	       echo php_strip_whitespace(__FILE__); do_nothing(); ?>

	       Notice the PHP comments are gone, as are the whitespace and newline after the first echo statement.

PHP Documentation Group 												   PHP_STRIP_WHITESPACE(3)