Ersin Acar

If you used Facebook on a regularly basis, you’ve probably come across their cool autocomplete method of adding multiple recipients to messages. For those that haven’t seen it, here’s a pic:

Guillermo Rauch set out to build something similar and he did a very good job of mimicking this behavior using MooTools v1.2:

The failing in using the value of $_SERVER['REMOTE_ADDR'] is that if the visitor is using a proxy then you will get the proxy IP address and not the visitors real IP address.

This function works by going through any variables in the $_SERVER array that might exist that would contain information to do with IP addresses. If they are all empty then the function finally looks at $_SERVER['REMOTE_ADDR'] value and returns this as a default.

function getRealIpAddr(){
 if ( !empty($_SERVER['HTTP_CLIENT_IP']) ) {
  //check ip from share internet
  $ip = $_SERVER['HTTP_CLIENT_IP'];
 } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR']) ) {
  //to check ip is pass from proxy
  $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
 } else {
  $ip = $_SERVER['REMOTE_ADDR'];
 }
 return $ip;
}

To run this function just call it.

echo getRealIpAddr();

This function was originally found here.

It is sometimes a good idea to find out where users can come from. When PHP is run the $_SERVER superglobal is always available and if the user has clicked on a link and landed on your page then the HTTP_REFERER value will be set. You can retrieve it like this.

if ( isset($_SERVER[ HTTP_REFERER ]) ) {
 echo $_SERVER['HTTP_REFERER'];
}

Of course you might want to do something useful with this. For example, you might want to know what link a user clicked on when they broke your application.

This simple code example uses a combination of strrchr to find the last occurrence of a string and substr to return part of the string in order to find the file extension for a given filename. This is ideal if you want to quickly find a file extension.

$ext = substr(strrchr($fileName, '.'), 1);

This code can be used in the following way.

$fileName = '\path\to\file\afile.jpg';
$ext = substr(strrchr($fileName, '.'), 1);
echo $ext;

The output here is ‘jpg’;

There are three available cryptographic functions in PHP, these are md5(), sha1() and crc32(). All of the functions take a string and output a value that is encrypted and can’t be reversed to the original string. In fact the only way to get the original string back is to run a brute force algorithm which tries to guess what the original string was.

To test these functions I will use the following string.

$string = 'wibble';

md5()
This function returns the hash as a 32-character hexadecimal number. The md5() function is used quite a bit and most PHP programmers will have come across it at some point.

md5($string);
//returns 50eccc6e2b0d307d5e8a40fb296f6171

The md5() and sh1() functions have a second parameter which makes the function return binary data if set to true (the default is false). This returns binary data, which can be turned back into a hexadecimal number by using the bin2hex() function.

bin2hex(md5($string, true));

This function returns the same as in the previous example.
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1. Ajax Auto Suggest v.2
The AutoSuggest class adds a pulldown menu of suggested values to a text field. The user can either click directly on a suggestion to enter it into the field, or navigate the list using the up and down arrow keys, selecting a value using the enter key. The values for the suggestion list are to provided as XML, or as JSON (by a PHP script, or similar). This auto suggest class is very simple to customize and reuse in your web pages. Take a look here for the demo.

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Hi!
i made this function at 2006 but still using it’s very usefull!

image.php;

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<?php
function createimg () {
session_start();
ini_set("session.gc_maxlifetime","36000");
	$fontnum=6;  //count of fonts
	$numbers = strtoupper(substr(rand(0,999999999999),-3)); 
	$_SESSION["guv"] = $numbers; 
	$im = imagecreatetruecolor(125, 75); 
	$white = imagecolorallocate($im, 255, 255, 255);
	imagefilledrectangle($im, 0, 0, 400, 200, $white); 
	for ($i=0;$i<strlen($numbers);$i++)
		{
			$font = "fonts/".rand(1,$fontnum).".TTF";
 
			if ((rand(2,6)%2)) { $angel=rand(0, 30); } else { $angel=rand(330, 360); }
			imagettfnumbers($im, 25, $angel, 10+$i*35, 49, imagecolorallocate($im, rand(1,250), rand(1,250), rand(1,250)), $font,$numbers[$i]);
		}
	$x=100; $y=100; $size=200;
	header("Content-type: image/png");
	imagepng($im);
	imagedestroy($im);
}
createimg();
?>

You need 6 fonts in ./fonts directory like;
1.TTF
2.TTF
3.TTF
4.TFF
5.TFF
6.TFF

usage example;

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<img src="imgcode.php" alt="security" name="guv" id="guv"/>
<!-- and also i made a relod image button here it is; -->
<img src="images/reload.gif" width="16" height="16" border="0" alt="refresh" onclick="i=i+1; document.getElementById('guv').src='imgcode.php?id='+i"/>

Here is the a screen shot;

Hi,

Here i am again! I’ll start bloging again about web stuff. And share my hand made classes and codes