Apple’s ALAC codec is now open source.

$args=array(
);
$categories=get_categories($args);
foreach($categories as $category) {
echo '<li><strong><a href="' . get_category_link( $category->term_id ) . '" title="' . sprintf( __( "View all posts in %s" ), $category->name ) . '" ' . '>' . $category->name.'</a></strong>';
echo '<br />'. $category->description . '</li>';
}

#wpyagnav{
height: 61px;
background: #d0d0d0;
margin-left: auto;
margin-right: auto;
width: 980px;
}

ul.wpyagcat{
padding-top: 11px;
}

ul.wpyagcat li{
display: inline;
float: left;
position: relative;
margin-left: 18px;
text-align: center;
}

<FilesMatch "\.(htm|html|css|js)$">
AddDefaultCharset UTF-8
</FilesMatch>

This is how it’s done

$email = "someone@exa mple.com";

if(!filter_var($email, FILTER_VALIDATE_EMAIL))
  {
  echo "E-mail is not valid";
  // Rest of PHP-code
  }
else
  {
  echo "E-mail is valid";
  // Rest of PHP-code
  }

So – how can we prevent this?
By using php’s function called intval() we can check that it returns as an integer.

This is how it can be done:

// Echo out the user-id wich we get from $_GET wich will return 1 or 1=1
echo $_GET['userId'];
// Wrap the $_GET with intval()-function and set it to the $id variable
$id=intval($_GET['userId']);
// Echoing out the id will now return '1'
echo $id; // 1

// We're now selecting som the table "users" with out '$id' var - wich is a clean integer variable! This is safe!
mysql_query('SELECT * FROM users WHERE id='.$id);

Do remember to sanitize your variables with more functions if they contain other data than just integers. Using stripslashes and mysql_real_escape_string is a good method! More on this in a later post!

Validate username

Validate username, consist of alpha-numeric (a-z, A-Z, 0-9), underscores, and has minimum 5 character and maximum 20 character. You could change the minimum character and maximum character to any number you like.

$username = "user_name12";
if (preg_match('/^[a-z\d_]{5,20}$/i', $username)) {
    echo "Your username is ok.";
} else {
    echo "Wrong username format.";
}

Validate IP addresses

Validate Ip adresses

$IP = "198.168.1.78";
if (preg_match('/^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/',$IP)) {
    echo "Your IP address is ok.";
} else {
    echo "Wrong IP address.";
}

Validate Creditcard

Validate creditcards with this regexp

$cc = "378282246310005";
if (preg_match('/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$/', $cc)) {
    echo "Your credit card number is ok.";
} else {
    echo "Wrong credit card number.";
}

Validate URL’s

Used to validate the urls

$url = "http://nlstudio.se/";
if (preg_match('/^(http|https|ftp):\/\/([A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?/i', $url)) {
    echo "Your url is ok.";
} else {
    echo "Wrong url.";
}

Extract domain name from certain URL

This regexp will extract the domainname from a URL

$url = "http://nlstudio.com/index.html";
preg_match('@^(?:http://)?([^/]+)@i', $url, $matches);
$host = $matches[1];

echo $host;

Highlight

Used to highlight certain words in a string

$text = "This is a sample text from nlstudio where you can read more about php, webdesign, photography and get to know the user behind the blog.";

$text = preg_replace("/\b(nlstudio)\b/i", '<span style="background:#5fc9f6">\1</span>', $text);

echo $text;

select email,count(email) from `tbl_users`
group by email having count(email) > 1

By doing this is could see wich emails where registered 2+ and simply remove them!

include ('includes/functions.php');
censor($userPost);

And make sure that your functions.php file contains this code:

function censor($text){
// Create an array of 'badwords'
$change = array('badword1', 'badword2', 'badword3');

// Replace all the bad words
$text = str_replace($change, "***", $text);

return $text;
}