Posts Tagged Echo

Prevent sql injection code

Posted by in PHP code on July 23rd, 2009

SQL Injection is a technique where an attacker creates or alters existing SQL commands to tamper data, override valuable ones, or even to execute dangerous system level commands on the database host. To avoid this, always check your input data using the function below:

function checkValid($str)
{
$valid_string = “[\*\^\'\;]“;
if(ereg($valid_string,$str))
{
echo(”<script>alert(’Invalid characted’);</script>”);
die();
}
else
{
return $str;
}
}

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How to make wordpress plugin: General

Posted by in PHP code, Wordpress plugin on July 21st, 2009

This article will present you with the basics of wordpress plugin. I have create a plugin to help you understand how to create a plugin. This simple plugin shows a digg button to all your post. You can download the full code here. Below is several code I use:

class diggme
{
function diggme() {

add_action(’init’, array($this, ‘init’));
add_action(’admin_menu’, array(&$this, ’setmenu’));
add_filter(’the_content’, array(&$this, ‘the_content_filter’));
}

function init()
{
?>
<link href=”<?php echo get_option(’siteurl’); ?>/wp-content/plugins/diggme/css.css” rel=”stylesheet” type=”text/css” />
<?php
}

function managepage(){
echo “<div id=’setting’>This is setting page. Just ignore this</div>”;
}

function setmenu () {
add_options_page(
‘DiggMe’,
‘DiggMe’,
‘manage_options’,
__FILE__,
array(&$this,’managepage’ ) );
}

function the_content_filter($content)
{
return $this->displaydigg() . $content;
}

function displaydigg()
{
global $post;

return “<div id=\”diggbutton\”><a href=\”http://digg.com/submit?phase=2&amp;url=”.get_permalink($post->ID).”\”><img src=\”".get_settings(’siteurl’).”/wp-content/plugins/diggme/digg.png\”></a></div>”;
}

}

$diggme = new diggme();

  • The code will first create a class called diggme. Every time the plugin loads it will create an object of this class using $diggme = new diggme();

The constructor

  • add_action(’init’, array($this, ‘init’)); -> This will tell your blog to execute function init whenever it loads.
  • add_action(’admin_menu’, array(&$this, ’setmenu’)); -> This will tell your blog to create menu at your admin page. You can place any settings here.
  • add_filter(’the_content’, array(&$this, ‘the_content_filter’)); -> This will be executed every time when your post loads. In this example we will load function the_content_filter every time the page loads, read the post content and add a digg button to the post.

Other function is easy to understand if you have basic PHP skill. If you have any question just comment below.

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Joomla detect if home page

Posted by in PHP code on July 19th, 2009

To detect if current page is Joomla hage page, do this code:

<?php
$uri = $_SERVER['REQUEST_URI'];
if ($uri == “/”) {
echo “You’re on the homepage”;
}
?>

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Set cookie with php

Posted by in PHP code on June 14th, 2009

Here’s the code to set and get cookie

<?php

//set cookie
setcookie(”Cookie1″, $value);
setcookie(”Cookie2″, $value, time()+3600);

//get cookie

echo $_COOKIE["Cookie2"];
?>

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