Koree Monteloyola

Let's say you're given a hundred "digital" images and you need to put watermarks on each of those photos.

If you're going to do this manually, man! It would eat a lot of your time.

So here's a solution: a php script that would automatically merge a watermark to an image.

Requirements:

• PHP 4+
• GD 2.0+ Library
• watermark file should be saved as PNG-8, not PNG-24.

<?php
$err=0;
if(empty($_GET['path'])){
    $path = 'images/wrongPath.gif';
    $err++;
}else{
    if(!is_file(getcwd().'/images/'.$_GET['path'])){
        $path = 'images/wrongPath.gif';
    }else{
        $path = 'images/'.$_GET['path'];
    }
}
$srcImage = $path;
header("Content-type: " . image_type_to_mime_type(exif_imagetype($srcImage)));
switch(exif_imagetype($srcImage)){
    case IMAGETYPE_GIF:
        $image = imagecreatefromgif($srcImage);
        break;
    case IMAGETYPE_JPEG:
        $image = imagecreatefromjpeg($srcImage);
        break;
    case IMAGETYPE_PNG:
        $image = imagecreatefrompng($srcImage);
        break;
}
if(empty($err)){
    $watermark = imagecreatefrompng(getcwd().'/images/watermark.png');
    $watermark_width = imagesx($watermark);
    $watermark_height = imagesy($watermark);
    $size = getimagesize($srcImage);
    $dest_x = $size[0] - $watermark_width - 10;
    $dest_y = $size[1] -$watermark_height - 10;
    imagecopymerge($image, $watermark, $dest_x, $dest_y, 0, 0, $watermark_width, $watermark_height, 100);
}
switch(exif_imagetype($srcImage)){
    case IMAGETYPE_GIF:
        imagegif($image);
        break;
    case IMAGETYPE_JPEG:
        imagejpeg($image);
        break;
    case IMAGETYPE_PNG:
        imagepng($image);
        break;
}
imagedestroy($image);
imagedestroy($watermark);
?>

You can download a sample of the script here.

This is the script I use to dynamically generate my site's RSS using php and mysql.

<?php
$sql = "SELECT * FROM mydatabase.mysite_articles";
$result = mysql_query($sqll) or die("Cannot generate rss");
$numrows = mysql_num_rows($result);
if($numrows > 0){
    $now = date("D, d M Y H:i:s T");
    $string = "<?xml version="1.0"?>
            <rss version="2.0">
            <channel>
                <title>title of your site here</title>
                <link>yoursite.com/rss.php</link>
                <description>".htmlentities(site's description here)."</description>
                <language>en-us</language>
                <pubDate>".$now."</pubDate>
                <lastBuildDate>".$now."</lastBuildDate>
                <docs>url as reference of rss documentation</docs>
                <managingEditor>emailhere@yoursite.com</managingEditor>
                <webMaster>emailhere@yoursite.com</webMaster> ";
    while($row = mysql_fetch_array($result)){
        $string .= "<item> ";
        $string .= "<title>".$row[title']."</title> ";
        $string .= "<link>".$row['link']."</link> ";
        $string .= "<description>".$row['link']."</description> ";
        $output .= "<pubDate>".date("D, d M Y H:i:s T",$row['date_timestamp']))."</pubDate> ";
        $string .= "</item> ";
    }
    $string .= "</channel> ";
    $string .= "</rss> ";
    header("Content-Type: application/rss+xml");
    echo $string;
}
?>

Using a content-disposition header,  which specifies the output and presentation of the body part as an xml/rss, there is no need to create a separate rss file (through fopen/fwrite).

The content-disposition header is being specified through this line of code:

header("Content-Type: application/rss+xml");