本篇PHP教程使用了两个函数来生成水印：watermark_text()和watermark_image()。你可以将本篇教程的示例整合到你的WEB项目中，比如上传图片的版权水印。
文本水印
我们使用函数watermark_text()来生成文本水印，你必须先指定字体源文件、字体大小和字体文本，具体代码如下：
$font_path = “GILSANUB.TTF”; // Font file
$font_size = 30; // in pixcels
$water_mark_text_2 = “phpfuns”; // Watermark Text
function watermark_text($oldimage_name, $new_image_name)
{
global $font_path, $font_size, $water_mark_text_2;
list($owidth,$oheight) = getimagesize($oldimage_name);
$width = $height = 300;
$image = imagecreatetruecolor($width, $height);
$image_src = imagecreatefromjpeg($oldimage_name);
imagecopyresampled($image, $image_src, 0, 0, 0, 0, $width, $height, $owidth, $oheight);
$blue = imagecolorallocate($image, 79, 166, 185);
imagettftext($image, $font_size, 0, 68, 190, $blue, $font_path, $water_mark_text_2);
imagejpeg($image, $new_image_name, 100);
imagedestroy($image);
unlink($oldimage_name);
return true;
}
可以在这里查看demo。
图片水印
我们使用函数watermark_image()来生成图片水印，你必须先水银图片的源文件。具体代码如下：
$image_path = “phpfuns.png”;
function watermark_image($oldimage_name, $new_image_name)
/{
global $image_path;
list($owidth,$oheight) = getimagesize($oldimage_name);
$width = $height = 300;
$im = imagecreatetruecolor($width, $height);
$img_src = imagecreatefromjpeg($oldimage_name);
imagecopyresampled($im, $img_src, 0, 0, 0, 0, $width, $height, $owidth, $oheight);
$watermark = imagecreatefrompng($image_path);
list($w_width, $w_height) = getimagesize($image_path);
$pos_x = $width – $w_width;
$pos_y = $height – $w_height;
imagecopy($im, $watermark, $pos_x, $pos_y, 0, 0, $w_width, $w_height);
imagejpeg($im, $new_image_name, 100);
imagedestroy($im);
unlink($oldimage_name);
return true;
}
上传图片表单
我们使用下面的表单来上传图片：
<?php
$demo_image= “”;
if(isset($_POST[‘createmark’]) and $_POST[‘createmark’] == “Submit”)
{
$path = “uploads/”;
$valid_formats = array(“jpg”, “bmp”,”jpeg”);
$name = $_FILES[‘imgfile’][‘name’];
if(strlen($name))
{
list($txt, $ext) = explode(“.”, $name);
if(in_array($ext,$valid_formats) && $_FILES[‘imgfile’][‘size’] <= 256*1024)
{
$upload_status = move_uploaded_file($_FILES[‘imgfile’][‘tmp_name’], $path.$_FILES[‘imgfile’][‘name’]);
if($upload_status){
$new_name = $path.time().”.jpg”;
// Here you have to user functins watermark_text or watermark_image
if(watermark_text($path.$_FILES[‘imgfile’][‘name’], $new_name))
$demo_image = $new_name;
}
}
else
$msg=”File size Max 256 KB or Invalid file format.”;
}
}
?>
// HTML Code
<form name=”imageUpload” method=”post” enctype=”multipart/form-data” >
Upload Image
Image :<input type=”file” name=”imgfile” /><br />
<input type=”submit” name=”createmark” value=”Submit” />
<?php
if(!emptyempty($demo_image))
echo ‘<img src=”‘.$demo_image.'” />’;
?>
</form>
实际上就是PHP的gd库，一切就是这么简单！
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