Tutorial Get Width/Height of Image

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If all you have for an image is the URL, you can still find the dimensions:

<?php

  list($width, $height, $type, $attr) = getimagesize("url/to/image.jpg");

  echo "Image width " . $width;
  echo "Image height " . $height;
  echo "Image type " . $type;
  echo "Attribute " . $attr;

?>

Reference URL

Tutorial Get Users IP Address

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Accounts for proxies:

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
     $ip=$_SERVER['HTTP_CLIENT_IP'];
} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
     $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
} else {
     $ip=$_SERVER['REMOTE_ADDR'];
}

Reference URL

Tutorial Get Suffix of Given Number/Date

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function get_suffix($number) {

   $last_number = substr($number,-1); //fetch the last number

   if($last_number == "0" || $last_number == 0){ $last_number = 4; } // if last number is 0 than it assign value 4
      return date("S",mktime(0,0,0,1,$last_number,2009));
}

Returns suffix of any number:
1 = st
2 = nd
3 = rd
4 = th
50 = th

Example: This is the 23rd coolest snippet ever.

Return date of month with appropriate suffix

function day_of_month(  ) {
        $number = date( 'j' );
        if ( $number[( strlen( $number ) - 1 )] == 1 ) {
                $suffix = "st";
        } elseif ( $number[( strlen( $number ) - 1 )] == 2 ) {
                $suffix = "nd";
        } elseif ( $number[( strlen( $number ) - 1 )] == 3 ) {
                $suffix = "rd";
        } else {
                $suffix = "th";
        }
        return array( "number" => $number, "suffix" => $suffix );
}

Regular expression field validation jQuery

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In jQuery, is there a function/plugin which I can use to match a given regular expression in a string?

 Yes

jQuery plugin: Validation

This jQuery plugin makes simple clientside form validation trivial, while offering lots of option for customization. That makes a good choice if you’re building something new from scratch, but also when you’re trying to integrate it into an existing application with lots of existing markup. The plugin comes bundled with a useful set of validation methods, including URL and email validation, while providing an API to write your own methods. All bundled methods come with default error messages in english and translations into 37 locales.

You can download this plugin
http://bassistance.de/jquery-plugins/jquery-plugin-validation/

Function PHP Get Image Information

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/*
 * @param string $file Filepath
 * @param string $query Needed information (0 = width, 1 = height, 2 = mime-type)
 * @return string Fileinfo
 */

function getImageinfo($file, $query) {
       if (!realpath($file)) {
               $file = $_SERVER["DOCUMENT_ROOT"].$file;
       }
       $image = getimagesize($file);
       return $image[$query];
}

PHP Get Geo-IP Information

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Requests a geo-IP-server to check, returns where an IP is located (host, state, country, town).

<?php
       $ip='94.219.40.96';
       print_r(geoCheckIP($ip));
       //Array ( [domain] => dslb-094-219-040-096.pools.arcor-ip.net [country] => DE - Germany [state] => Hessen [town] => Erzhausen )

       //Get an array with geoip-infodata
       function geoCheckIP($ip)
       {
               //check, if the provided ip is valid
               if(!filter_var($ip, FILTER_VALIDATE_IP))
               {
                       throw new InvalidArgumentException("IP is not valid");
               }

               //contact ip-server
               $response=@file_get_contents('http://www.netip.de/search?query='.$ip);
               if (empty($response))
               {
                       throw new InvalidArgumentException("Error contacting Geo-IP-Server");
               }

               //Array containing all regex-patterns necessary to extract ip-geoinfo from page
               $patterns=array();
               $patterns["domain"] = '#Domain: (.*?)&nbsp;#i';
               $patterns["country"] = '#Country: (.*?)&nbsp;#i';
               $patterns["state"] = '#State/Region: (.*?)<br#i';
               $patterns["town"] = '#City: (.*?)<br#i';

               //Array where results will be stored
               $ipInfo=array();

               //check response from ipserver for above patterns
               foreach ($patterns as $key => $pattern)
               {
                       //store the result in array
                       $ipInfo[$key] = preg_match($pattern,$response,$value) && !empty($value[1]) ? $value[1] : 'not found';
               }

               return $ipInfo;
       }

?>

PHP function Get File Size

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/*
 * @param string $file Filepath
 * @param int $digits Digits to display
 * @return string|bool Size (KB, MB, GB, TB) or boolean
 */

function getFilesize($file,$digits = 2) {
       if (is_file($file)) {
               $filePath = $file;
               if (!realpath($filePath)) {
                       $filePath = $_SERVER["DOCUMENT_ROOT"].$filePath;
       }
           $fileSize = filesize($filePath);
               $sizes = array("TB","GB","MB","KB","B");
               $total = count($sizes);
               while ($total-- && $fileSize > 1024) {
                       $fileSize /= 1024;
                       }
               return round($fileSize, $digits)." ".$sizes[$total];
       }
       return false;
}