A few weeks ago I showed you how to create your own URL-Shortener. I decide to improve it, creating a simple system to control the number of access

First of all you need to add some tables to your data base:

After this you should do a modification in your function-little-url.php in the function take_url($url):

In this System there is a table with IPs that already accessed some URL, when a URL is accessed it verify the IP, if it is on the table just create an access to this IP in the new address. Otherwise, add the IP and create the access to the address.

How to create a URL-Shortener with Statistics

Matheus

Here I will show you how to create your own url shortener.

First of all you need to create a table like this:

CREATE TABLE IF NOT EXISTS `urls` (
`uid` int(11) NOT NULL auto_increment,
`url` text default NULL,
`unique_chars` varchar(25) BINARY NOT NULL,
PRIMARY KEY (`uid`),
UNIQUE KEY `unique_chars` (`unique_chars`)
);

This code was taken from Abhise in this post “Create your own tinyurl with php and mySQL” that was my bigest reference, from it I took some functions and update other ones to be more efficient. For an example I changed the field to BINARY so it be CASE SENSITIVE (aaaa different from AAAA)

The Abhise says to create many files, I particularly, created one file with all functions where I add all the functions and just called the functions in the files.

We need a fucntion to connect/disconnect to mysql

error_reporting(E_ALL);
$link;
$config;
function connect_db_lurl() {
global $link;
global $config;
$hostname = “localhost”;
$username = “USUARIO”;
$password = “SENHA”;
$dbname = “DATABASE”;
$link = mysql_connect($hostname, $username, $password); // Conecta ao mysql.
mysql_select_db($dbname) or die(“Unknown database!”); // Seleciona o Banco de dados.
$config["domain"] = “http://seudominio.com”; // Define a configuração da URL inicial
}

function close_db_lurl() {
mysql_close(); // Fecha a conexão com o banco de dados
}

After this I created a function to redirect to the URL.

function redirect($url) {
header(“Location:”.$url); // Redireciona para a url.
}

Than I used the function from Abhise to generate the char sequence. (I add some chars to elevate the number of combinations

function generate_chars() {
$num_chars = 6; // Tamanho que você deseja as strings
$i = 0;
$my_keys = “123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ”; // Caracteres que valem para formação de endereço
$keys_length = strlen($my_keys);
$url = “”;
while($i<$num_chars) { // Gera sequencia aleatoria
$rand_num = mt_rand(1, $keys_length-1);
$url .= $my_keys[$rand_num];
$i++;
}
return $url;
}

Created a function to verify if the key is unique.

function isUnique($chars) {
global $link;
$q = “SELECT * FROM `urls` WHERE `unique_chars`=’”.$chars.”‘”;
$r = mysql_query($q, $link); // Verifica se a chave é unica.
if( mysql_num_rows($r)>0 ) {
return false;
} else {
return true;
}
}

And other to verify if the URL is in DB

function isThere($url) {
global $link;
$q = “SELECT * FROM `urls` WHERE `url`=’”.$url.”‘”;
$r = mysql_query($q); // Verifica se já existe a url
if(mysql_num_rows($r)>0) {
return true;
} else {
return false;
}
}

Function to create

function create() {
global $link;
global $config;
$chars = generate_chars(); // Gera sequencia de caracteres.

while(!isUnique($chars)){ // Verifica se é unico, se não for gera denovo.
$chars = generate_chars();
}

$url = $_GET["u"]; // Pega o endereço que está em ?u=endereço
$url = trim($url); // Retira espaços em branco do inicio e do fim
$url = mysql_real_escape_string($url);

if(!isThere($url)) { // Caso não exista o endereço no banco.
$q = “INSERT INTO `urls` (url, unique_chars) VALUES (‘”.$url.”‘, ‘”.$chars.”‘)”;
$r = mysql_query($q, $link); // Insere o endereço
if(mysql_affected_rows()) {
$q = “SELECT * FROM `urls` WHERE `url`=’”.$url.”‘”;
$r = mysql_query($q);
$row = mysql_fetch_row($r);
echo $config["domain"].”/”.$row[2]; // Imprime endereço para acesso da nova url
} else {
echo “Desculpe, problemas com o banco de dados.”;
}
} else { // Caso já exista
$q = “SELECT * FROM `urls` WHERE `url` = ‘”.$url.”‘”;
$r = mysql_query($q); // Seleciona endereço para URL
$row = mysql_fetch_row($r);
echo $config["domain"].”/”.$row[2]; // Imprime endereço para acesso da url.
}
}

Looking to the code I thought to create a function to get the url.

function take_lurl($lurl) {
global $link;
$q = “SELECT url FROM `urls` WHERE `unique_chars` = ‘”.$lurl.”‘”;
$r = mysql_query($q, $link); // Pega endereço original para tal string.
if(mysql_num_rows($r)>0) {
$info = mysql_fetch_array($r);
$url = $info["url"];
} else {
echo “Sorry, link not found!”;
}
return $url;
}

Created the file “functions-little-url.php” with these functions.

index.php:

ob_start(); //Inicia Buffer de saida
include("functions-little-url.php");
connect_db_lurl();
$lurl = $_GET["u"]; //Sequencia de caracteres
$url = take_lurl($lurl);
redirect($url);
close_db_lurl();
ob_end_flush(); // Fecha buffer de saida
?>

create.php:

include("functions-little-url.php");
connect_db_lurl();
create();
close_db_lurl();
?>

We need to add some lines do .htaccess and enable mod_rewrite.

RewriteEngine On
RewriteRule ^([1-9a-zA-Z]*)$ index.php\?u=$1 [L]

I did this in my system that uses wordpress (that already uses mod_rewrite) so it work a little bit different. This is my .htaccess

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f # Verifica se a página acessada não é um arquivo real
RewriteCond %{REQUEST_FILENAME} !-d# Verifica se a página acessada não é um diretório
RewriteRule ^([A-Za-z0-9]{6})$ /lurl/index.php?u=$1 [L] # Caso coincida com a expressão regular redirecione para /lurl/index.php?u=$1 onde /lurl/ é o diretório que está os meus arquivos de tiny-url e [L] indica que é a ultima instrução a ser executada.

# Caso não feche com a parte em cima continua nas regras “padrões” do WordPress
RewriteCond %{REQUEST_FILENAME} !-f # Verifica se a página acessada não é um arquivo real
RewriteCond %{REQUEST_FILENAME} !-d# Verifica se a página acessada não é um diretório
RewriteRule . /index.php [L]

(my URL shortener is inside /lurl/ directory but the redirect was done in matbra.com/XXXXXXX so it redirects to /lurl/

To create URLs acess create.php?u=ADDRESS

URL-Shortener

If you have any problem feel free to contact me.

Best Regards,
Matheus Bratfisch

References:
—- “Tiny Url”:
www.php.net
Wynia.org
htmlCenter
—- “Mod Rewrite”:
Apache Mod Rewrite