Watermark in PHP

$main_img = "Porsche_911_996_Carrera_4S.jpg"; //immagine principale
$watermark_img = "watermark.gif"; //use GIF or PNG, JPEG has no tranparency support
$padding = 3; //distance to border in pixels for watermark image
$opacity = 100; //image opacity for transparent watermark

$watermark = imagecreatefromgif($watermark_img); //create watermark
$image = imagecreatefromjpeg($main_img); //create main graphic

if(!$image || !$watermark)
	die("Error: main image or watermark could not be loaded!");

$watermark_size = getimagesize($watermark_img);
$watermark_width = $watermark_size[0];
$watermark_height = $watermark_size[1];  

$image_size = getimagesize($main_img);
$dest_x = $image_size[0] - $watermark_width - $padding;
$dest_y = $image_size[1] - $watermark_height - $padding;

//copy watermark on main image
imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, $opacity);

//print image to screen
header("content-type: image/jpeg");
imagejpeg($image);
imagedestroy($image);
imagedestroy($watermark);

Tratto da http://www.sastgroup.com/tutorials/aggiungere-un-watermark-alle-vostre-immagini-con-php

Gestire BBCode in PHP

function BBCode($text) {
/**
* The following array has the structure Key => Value.
* The key is the item that will be typed e.g [b] the value will be the html equivilant.
*/
	$BBCode = array("&" => "&amp;", "< " => "&lt;", ">" => "&gt;", "[b]" => "<b>", "[/b]" => "</b>", "[i]" => "<i>", "[/i]" => "</i>", "[u]" => "<u>", "[/u]" => "</u>", "[img]" => "<img src='", "[/img]" => "'/>"); // Comment Above
	$parsedtext = str_replace(array_keys($BBCode), array_values($BBCode), $text); //This function will get the input string. and then the keys and values of the array above. It will then replace them with the html equivilant.
	return $parsedtext; // Return $parsedtext.
}

Esempio Applicato:

$text = BBCode("[b][u]HELLO[/u][/b]"); // Execute Function
echo $text; // Echo $text.

Tratto da http://www.sastgroup.com/tutorials/bbcode-in-php