Php uses the GD library to implement text image watermarks and thumbnails tutorial-PHP source code

Thumbnails can be implemented through the gd library. Let's take a look at a simple example of using the GD library in php to implement text image watermarks and thumbnails. We hope this example can help you effectively. Thumbnails can be implemented through the gd library. Let's take a look at a simple example of using the GD library in php to implement text image watermarks and thumbnails. We hope this example can help you effectively.

Script ec (2); script

To use the gd library, you must first open the gd library, as shown below:

Enable GD library support for PHP in Windows

Find php. ini, open the content, and find:

; Extension = php_gd2.dll

Remove the Semicolon ";" at the beginning and save it. If there is no semicolon, it is enabled.

Specific can refer to the following: http://www.111cn.net/phper/php/48352.htm

I. How to add a text watermark

Require 'image. class. php'
$ Src = "001.jpg ";
$ Content = "hello ";
$ Font_url = "my. ttf ";
$ Size = 20;
$ Image = new Image ($ src );
$ Color = array (
0 => 255,
1 => 255,
2 => 255,
2 => 20
);
$ Local = array (
'X' => 20,
'Y' => 30
);
$ Angle = 10;
$ Image-> fontMark ($ content, $ font_url, $ size, $ color, $ local, $ angle );
$ Image-> show ();

Ii. How to Use Image thumbnails:

Require 'image. class. php'
$ Src = "001.jpg ";
$ Image = new Image ($ src );
$ Image-> thumb (300,200 );
$ Image-> show ();

Iii. image. class. php

Class image {
Private $ info;
Private $ image;
Public function _ contruct ($ src ){
$ Info = getimagesize ($ src );
$ This-> info = array (
'Width' => $ info [0],
'Height' => $ info [1],
'Type' => image_type_to_extension ($ info [2], false ),
'Mime '=> $ info ['mime'],

);
$ Fun = "imagecreatefrom {$ this-> info ['type']}";

$ This-> image = $ fun ($ src );

}

// Thumbnail
Public function thumd ($ width, $ height ){
$ Image_thumb = imagecreatetruecolor ($ width, $ height );
Imagecopyresampled ($ image_thumb, $ this-> image, 0, 0, 0, $ width, $ height, $ this-> info ['width'], $ this-> info ['height']);
Imagedestroy ($ this-> image );
$ This-> image = $ image_thumb;

}
// Text watermark
Public function fontMark ($ content, $ font_url, $ size, $ color, $ local, $ angle ){

$ Col = imagecolorallocatealpha ($ this-> image, $ color [0], $ color [1], $ color [2], $ color [3]);
$ Text = imagettftext ($ this-> image, $ size, $ angle, $ local ['X'], $ local ['y'], $ col, $ font_url, $ content );
}
// Output image
Public function show ()
{
Header ("Content-type:", $ this-> info ['mime ']);

$ Func = "image {$ this-> info ['type']}";
$ Func ($ this-> image );

}
Public function save ($ nwename ){
$ Func = "image {$ this-> info ['type']}";
// Retrieve image display from memory
$ Func ($ this-> image );
// Save the image
$ Func ($ this-> image, $ nwename. $ this-> info ['type']);

}
Public function _ destruct (){

Imagedestroy ($ this-> image );
}

}