PHP generates thumbnail classic class_PHP tutorial-PHP Tutorial-php.cn

PHP generates thumbnail classic class_PHP tutorial

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Release： 2016-07-13 10:46:09

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I found a php code to generate thumbnails from a foreign website. Friends in need can refer to it.

The code is as follows

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/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
*Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/

class SimpleImage {

var $image;
var $image_type;

function load($filename) {

$image_info = getimagesize($filename);
$this->image_type = $image_info[2];
If( $this->image_type == IMAGETYPE_JPEG ) {

            $this->image = imagecreatefromjpeg($filename);
} elseif( $this->image_type == IMAGETYPE_GIF ) {

            $this->image = imagecreatefromgif($filename);
} elseif( $this->image_type == IMAGETYPE_PNG ) {

             $this->image = imagecreatefrompng($filename);
}
}
function save($filename, $image_type=IMAGETYPE_JPEG, $compression=75, $permissions=null) {

If( $image_type == IMAGETYPE_JPEG ) {
Imagejpeg($this->image,$filename,$compression);
} elseif( $image_type == IMAGETYPE_GIF ) {

Imagegif($this->image,$filename);
} elseif( $image_type == IMAGETYPE_PNG ) {

Imagepng($this->image,$filename);
}
If( $permissions != null) {

           chmod($filename,$permissions);
}
}
Function output($image_type=IMAGETYPE_JPEG) {

If( $image_type == IMAGETYPE_JPEG ) {
Imagejpeg($this->image);
} elseif( $image_type == IMAGETYPE_GIF ) {

Imagegif($this->image);
} elseif( $image_type == IMAGETYPE_PNG ) {

Imagepng($this->image);
}
}
function getWidth() {

Return imagesx($this->image);
}
function getHeight() {

Return imagesy($this->image);
}
Function resizeToHeight($height) {

$ratio = $height / $this->getHeight();
$width = $this->getWidth() * $ratio;
$this->resize($width,$height);
}

Function resizeToWidth($width) {
$ratio = $width / $this->getWidth();
$height = $this->getheight() * $ratio;
$this->resize($width,$height);
}

   function scale($scale) {
      $width = $this->getWidth() * $scale/100;
      $height = $this->getheight() * $scale/100;
      $this->resize($width,$height);
   }

   function resize($width,$height) {
      $new_image = imagecreatetruecolor($width, $height);
      imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
      $this->image = $new_image;
   }

}
?>

Usage
Save the above file as SimpleImage.php and take a look at the following examples of how to use the script.

The first example below will load a file named picture.jpg resize it to 250 pixels wide and 400 pixels high and resave it as picture2.jpg

$image = new SimpleImage();

代码如下

代码如下	复制代码
include('SimpleImage.php'); $image = new SimpleImage(); $image->load('picture.jpg'); $image->resize(250,400); $image->save('picture2.jpg'); ?>

复制代码

代码如下	复制代码
include('SimpleImage.php'); $image = new SimpleImage(); $image->load('picture.jpg'); $image->resizeToWidth(250); $image->save('picture2.jpg'); ?>

include('SimpleImage.php');

$image->load('picture.jpg'); $image->resize(250,400);

$image->save('picture2.jpg');