DanielKassner.com

Posts Tagged ‘Coding’

Linux uptime

Aug 24, 2011 PHP Coding, Web Development

If you want to show the uptime of your linux server on your website, you can do so very easily.

<?php
function linuxUptime() {
  $ut = strtok( exec( "cat /proc/uptime" ), "." );
  $days = sprintf( "%2d", ($ut/(3600*24)) );
  $hours = sprintf( "%2d", ( ($ut % (3600*24)) / 3600) );
  $min = sprintf( "%2d", ($ut % (3600*24) % 3600)/60  );
  $sec = sprintf( "%2d", ($ut % (3600*24) % 3600)%60  );
  return array( $days, $hours, $min, $sec );
}

$ut = linuxUptime();
// If you would like to show the seconds as well just add [ , $ut[3] seconds ] after minutes.
echo "Time since last reboot: $ut[0] days, $ut[1] hours, $ut[2] minutes";
?>

Just call the $ut = linuxUptime() function and then you can use the variables to show the time.

**NOTE: Your server must allow you to run the exec() PHP command. Some hosts disable the execution of this and several other PHP functions.

Now if you were wanting to gather the uptime of multiple servers all at the same time this can be accomplished with CURL. What we would end up doing is using the above code and place it in a PHP file on each of the target servers. In the example below you will see I am referencing a file called linuxUptime.php which holds the code listed above. We could then use a MySQL database or just an array full of domain names that we would loop through to gather the stats. Below I am posting a simple script which uses an array as an example. (This file does not currently exist on my site to show uptime of my site)

<?php
$sites = array('danielkassner.com'); // Create a list of sites to check
foreach($sites as $site) { // Loop through each site and get uptime

$ch = curl_init(); // Initiate curl session
curl_setopt($ch, CURLOPT_URL, 'http://'.$site.'/linuxUptime.php'); // Set the URL of the uptime script
curl_setopt($ch, CURLOPT_HEADER, 0); // Disable header output
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); // Return data as a string instead of output directly
$data=curl_exec($ch); // Execute curl commands
curl_close ($ch); // Close the curl session

echo $site.': '.$data.'<br />'; // Output value returned from the linuxUptime.php file
} // End server loop
?>

When we gather stats like this we could easily store the uptime values in a database table so that we could track the history.

Enjoy!

Tags: Coding, Linux, PHP, uptime

Notepad++ Ctrl+Tab tip

Aug 11, 2011 Technology, Web Development

If you are like me and prefer to use the keyboard as much as possible instead of a mouse you will like this tip. When in Notepad++ if on your keyboard you press Ctrl+Tab it brings up a Windows style Alt+Tab menu to cycle through your open documents. When you let up on the keys it switches to the file you selected. Check out the screenshot below of it in action.

Tags: Coding, Notepad++, Tip

Get user operating system with PHP

Jun 11, 2010 PHP Coding

Ever wanted to find out what operating system your visitors are using? The following function will allow you to get the user operating system so you can use in a statistics application or show certain content on your website. This will allow server side decisions on what stylesheets to show or any other operating system specific content to be shown/hide.

<?php
/*
Author: Daniel Kassner
Website: http://www.danielkassner.com
*/
function getOS($userAgent) {
  // Create list of operating systems with operating system name as array key 
	$oses = array (
		'iPhone' => '(iPhone)',
		'Windows 3.11' => 'Win16',
		'Windows 95' => '(Windows 95)|(Win95)|(Windows_95)', // Use regular expressions as value to identify operating system
		'Windows 98' => '(Windows 98)|(Win98)',
		'Windows 2000' => '(Windows NT 5.0)|(Windows 2000)',
		'Windows XP' => '(Windows NT 5.1)|(Windows XP)',
		'Windows 2003' => '(Windows NT 5.2)',
		'Windows Vista' => '(Windows NT 6.0)|(Windows Vista)',
		'Windows 7' => '(Windows NT 6.1)|(Windows 7)',
		'Windows NT 4.0' => '(Windows NT 4.0)|(WinNT4.0)|(WinNT)|(Windows NT)',
		'Windows ME' => 'Windows ME',
		'Open BSD'=>'OpenBSD',
		'Sun OS'=>'SunOS',
		'Linux'=>'(Linux)|(X11)',
		'Safari' => '(Safari)',
		'Macintosh'=>'(Mac_PowerPC)|(Macintosh)',
		'QNX'=>'QNX',
		'BeOS'=>'BeOS',
		'OS/2'=>'OS/2',
		'Search Bot'=>'(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp/cat)|(msnbot)|(ia_archiver)'
	);

	foreach($oses as $os=>$pattern){ // Loop through $oses array
    // Use regular expressions to check operating system type
		if(eregi($pattern, $userAgent)) { // Check if a value in $oses array matches current user agent.
			return $os; // Operating system was matched so return $oses key
		}
	}
	return 'Unknown'; // Cannot find operating system so return Unknown
}
?>

An example of how this would be used:

<?php
echo getOS($_SERVER['HTTP_USER_AGENT']);
?>

This script can be used with the Get Browser Type, which also has the same structure as this script.

Tags: Coding, Linux, Microsoft, PHP

Prevent direct file access

Jun 4, 2010 PHP Coding

Do you have PHP files that you do not want visitors to directly run but would still like to use them in your code? Here is a little trick picked up from the code in the phpBB forum code.

Create a file named config.php or some other file that you are going to include before any other code. In this file put the following:

<?php
define('INMYSCRIPT', 1);
?>

This code creates a defined variable INMYSCRIPT which can be named as anything that you want. Then on every other page in your script that you do not want to be ran on their own put the following: (This filename is code.php)

<?php
if(!defined('INMYSCRIPT')){
echo 'You cannot access this file directly.';
die;
}

// Whatever other code you wish goes below here
echo 'This file is safe to be ran';
?>

Now, instead of the file outputting any data to the browser that could be harmful, the only content output is: “You cannot access this file directly”. You could very easily create a re-direct script to transfer them to a specific page or you could modify the text to any other HTML or other content you wanted.

Open up your web browser and try accessing code.php. You should get that error message that we created. Now if you create one last file that we will name as test.php, place the following:

<?php
require('config.php');
require('code.php');
?>

Now if you try accessing the test.php file from your web server you will be shown: “This file is safe to be ran”.

Tags: Coding, PHP, Security

Calculate a percentage

Jun 4, 2010 PHP Coding

Below is a quick function that simplifies the process of calculating a percentage in PHP.

<?php
function percent($Amount = 0, $Total = 0, $Decimal = 0) {
	// Make sure our numbers are actually numbers
	$Amount = (INT) $Amount;
	$Total = (INT) $Total;
	$Decimal = (INT) $Decimal;
	// Cannot divide by zero so check if Total = 0
	if ($Total === 0) {
		return 0;
	}
	$p = $Amount / $Total;
	// Multiply by 100 to move decimal point to correct location
	$p *= 100;
	// Return the percentage with specified decimal places
	return number_format($p, $Decimal);
}
?>

Then to use this code you can do:

<?php
// prints out 10% on the screen
echo percent(10, 100),'%';
?>

Tags: Coding, Math, PHP

Add suffix to a number

Jun 1, 2010 PHP Coding, Technology

Have you ever had to dynamically add the suffix to a number? (ie. st, nd, rd, th)

<?php
/*
Author: Daniel Kassner
Website: http://www.danielkassner.com
*/
function number_suffix($i) {
    switch( floor($i/10) % 10 ) {
        default:
	    switch( $i % 10 ) {
                case 1: return 'st';
                case 2: return 'nd';
                case 3: return 'rd';  
            }
        case 1:
    }
    return 'th';
}
?>

Then to use the code you would do like:

<?php
$number = 10;
// This will display 10th
echo $number,number_suffix($number);
?>

Tags: Coding, Numbers, PHP

Get Browser Type

Jun 1, 2010 PHP Coding, Technology

Have you ever wanted to create a stats application that identifies the users browser type? The following function will allow you to easily do just that. This function can be expanded by adding more values to the $browser array so you can match other browsers. This getBrowser() function parses the $_SERVER['HTTP_USER_AGENT'] variable to get the current browser.

<?php
/*
Author: Daniel Kassner
Website: http://www.danielkassner.com
*/
function getBrowser($userAgent) {
  // Create list of browsers with browser name as array key and user agent as value. 
	$browsers = array(
		'Opera' => 'Opera',
		'Mozilla Firefox'=> '(Firebird)|(Firefox)', // Use regular expressions as value to identify browser
		'Galeon' => 'Galeon',
		'Mozilla'=>'Gecko',
		'MyIE'=>'MyIE',
		'Lynx' => 'Lynx',
		'Netscape' => '(Mozilla/4\.75)|(Netscape6)|(Mozilla/4\.08)|(Mozilla/4\.5)|(Mozilla/4\.6)|(Mozilla/4\.79)',
		'Konqueror'=>'Konqueror',
		'SearchBot' => '(nuhk)|(Googlebot)|(Yammybot)|(Openbot)|(Slurp/cat)|(msnbot)|(ia_archiver)',
		'Internet Explorer 8' => '(MSIE 8\.[0-9]+)',
                'Internet Explorer 7' => '(MSIE 7\.[0-9]+)',
		'Internet Explorer 6' => '(MSIE 6\.[0-9]+)',
		'Internet Explorer 5' => '(MSIE 5\.[0-9]+)',
		'Internet Explorer 4' => '(MSIE 4\.[0-9]+)',
	);

	foreach($browsers as $browser=>$pattern) { // Loop through $browsers array
    // Use regular expressions to check browser type
		if(eregi($pattern, $userAgent)) { // Check if a value in $browsers array matches current user agent.
			return $browser; // Browser was matched so return $browsers key
		}
	}
	return 'Unknown'; // Cannot find browser so return Unknown
}
?>

How to use this code:

<?php
echo getBrowser($_SERVER['HTTP_USER_AGENT']);
$browserType = getBrowser($_SERVER['HTTP_USER_AGENT']);
echo '<br />I am currently running '.$browserType.' as my web browser';
?>

This would produce the following if I were(and am) running Mozilla Firefox:

Mozilla Firefox
I am currently running Mozilla Firefox as my web browser

If you wanted to see a larger list of browser user agent strings to expand this code you can find them at: User Agent String dot com

Tags: Coding, PHP, Web Browser

Convert Dell service tags and express service tags with PHP

May 27, 2010 PHP Coding, Work

I was given the task at my real job of creating some code to find the service tag from the express service tag of Dell laptops. We only had recorded the express service tag for the 100+ laptops and needed to have the service tag in a project we were working on. I was given some very basic information about the relationship between the two and came up with the following code. With this code you can convert service tags into express service tags and the other way around. It uses a base 36 style formating.

<?php
/*
Author: Daniel Kassner
Website: http://www.danielkassner.com
*/
function convertExpress($tag) {
  $index = array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','e');
  
  for($i=10; $i>=0; $i--) {
    $digits[$i] = '0';
    for($k=1; $k<=36; $k++) {
      $tmp = (pow(36, $i)) * $k;
      $tmp2 = $tag - $tmp;
      if($tmp2 < 0) {
        $tmp = (pow(36, $i)) * ($k-1);
        $digits[$i] = $index[$k-1];
        $tag -= $tmp;
        break;
      }
      
      if($tmp2 == 0) {
        $digits[$i] = $index[$k];
        $tag -= $tmp;
        break;
      }   
    }
  }
  $leading = 1;
  foreach($digits as $digit) {
    /*if($digit != '0') {
      $num .= $digit;
    }*/
    if($leading) {
      if($digit != '0') {
        $leading = 0;
        $num .= $digit;
      }
    } else {
      $num .= $digit;
    }
  }
  return $num;
}
?>

To use this code you could use:

<?php
echo convertExpress('(YOUR EXPRESS SERVICE TAG HERE');
?>

Make sure you only use numbers this field.

To get the express service tag from the service tag use the following function:

<?php
/*
Author: Daniel Kassner
Website: http://www.danielkassner.com
*/
function convertTag($tag) {
  $tag = strtoupper($tag);
  $index = array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z');
  $count = strlen($tag);
  $count2 = $count - 1;
  for($i=0; $i<$count; $i++) {
    $digits[$count2] = substr($tag, $i, 1);
    $count2--;
  }
  $numb = 0;
  for($i=0; $i<count($digits); $i++) {
    if($i==0) {
      $m = 1;
    } else {
      $m = pow(36, $i);
    }
    $key = array_keys($index, $digits[$i]);
    $tmp = ($m * $key[0]);
    $numb += $tmp;
  } 
  return $numb;
}
?>

To use this code you can use:

<?php
echo convertTag('(YOUR SERVICE TAG HERE)');
?>

Tags: Coding, Dell, PHP

Sanitize copy/paste text from word

May 27, 2010 PHP Coding, Work

In a recent project I have had to deal with text copied from a Microsoft Word document and pasted into a textarea. Word automatically changes a few certain characters to what it thinks it should be, such as the ellipsis and quotes. When dealing with inserting that text into a database I was getting errors. To solve my problems I created a sanitize function to replace these certain characters with acceptable characters.

<?php
// Used to sanitize Microsoft Word's Special Characters
// Good reference http://www.lookuptables.com

function SanitizeFromWord($Text = '') {

	$chars = array(
		130=>',',     // baseline single quote
		131=>'NLG',   // florin
		132=>'"', 	  // baseline double quote
		133=>'...',   // ellipsis
		134=>'**',	  // dagger (a second footnote)
		135=>'***',	  // double dagger (a third footnote)
		136=>'^', 	  // circumflex accent
		137=>'o/oo',  // permile
		138=>'Sh',	  // S Hacek
		139=>'<',	  // left single guillemet
		140=>'OE',	  // OE ligature
		145=>'\'',	  // left single quote
		146=>'\'',	  // right single quote
		147=>'"',	  // left double quote
		148=>'"',	  // right double quote
		149=>'-',	  // bullet
		150=>'-',	  // endash
		151=>'--',	  // emdash
		152=>'~',	  // tilde accent
		153=>'(TM)',  // trademark ligature
		154=>'sh',	  // s Hacek
		155=>'>',	  // right single guillemet
		156=>'oe',	  // oe ligature
		159=>'Y',	  // Y Dieresis
		169=>'(C)',	  // Copyright
		174=>'(R)'	  // Registered Trademark
	);
	
	foreach ($chars as $chr=>$replace) {
		$Text = str_replace(chr($chr), $replace, $Text);
	}
	return $Text;
}
?>

Enjoy!

Tags: Coding, Microsoft, PHP

Remove whitespace from string

May 23, 2010 PHP Coding

I have been doing a lot of coding using the framework CodeIgniter lately so I have been creating many simple helper functions to perform different tasks. My most recent project involves creating PDF files with text from a database. The problem is that the text from the database is dirty, meaning that in a person’s name there could be multiple spaces between the person’s first and last name or even spaces at the end of their name. In dealing with legacy data that you cannot change but needs to be output correctly without those spaces you get creative. I am sure I could use trim(), ltrim() or rtrim() to remove the spaces but that does not remove the multiple spaces between names. The below function should help solve this issue.

<?php
function replace_whitespace($Value = '')
{
	// Replace any whitespace with only a single space
	return preg_replace('/\s+/', ' ', trim($Value));
}
?>

Usage:

<?php
echo '<pre>';
$Text = 'Daniel     Kassner';
echo $Text,' - ',strlen($Text),'<br />';
$Text = ReplaceWhitespace($Text);
echo $Text,' - ',strlen($Text);
echo '</pre>';
?>

Output:

Daniel     Kassner - 18
Daniel Kassner - 14

Tags: Coding, PHP

DanielKassner.com

Posts Tagged ‘Coding’

Linux uptime

Notepad++ Ctrl+Tab tip

Get user operating system with PHP

Prevent direct file access

Calculate a percentage

Add suffix to a number

Get Browser Type

Convert Dell service tags and express service tags with PHP

Sanitize copy/paste text from word

Remove whitespace from string

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