Sharing of usage methods and usage examples of PHP image proportional scaling class SimpleImage_PHP Tutorial

Usage example:
Set width, scale proportionally

Copy code The code is as follows:

< ;?php
include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image-> ;resizeToWidth(250);
$image->save('picture2.jpg');?>

Set the height and scale proportionally

Copy code The code is as follows:

include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->resizeToHeight(500);
$image->save('picture2.jpg');
$image ->resizeToHeight(200);
$image->save('picture3.jpg');?>

Scale to 50%

Copy code The code is as follows:

include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture.jpg');
$image->scale(50);
$image->save('picture2.jpg');?>

Output directly to the screen after scaling

Copy code The code is as follows:

header('Content-Type: image/jpeg');
include('SimpleImage.php');
$image = new SimpleImage();
$image->load('picture. jpg');
$image->resizeToWidth(150);
$image->output();?>

Usage example:

Copy code The code is as follows:

include("SimpleImage.php");//The image processing class is below

$url="http://f3.v.veimg.cn/meadincms/1/2013/0703/20130703100937552.jpg";
$picfile = down($url);//Download picture (download The path of the image can be cleared after processing is completed, but it is not processed here)
$res = new SimpleImage();//Image processing example
$res = $res->load($picfile);
$tmpfile = tempfile().'.jpg';//Create a path file to save the image
$width = '30';//Set the width of the image
$res->resizeToWidth($ width);
$res->save($tmpfile);//Save the processed image (without .jpg suffix)
//A total of 3 files are generated here, one is the downloaded image file , one is a temporary file, and the last one is a processed image file. The first two files need to be optimized and cleaned up.

function down($url)
{
$http = array();
$header = "http://f3.v.veimg.cn";
if ($header) {
                                                                                                                                     
$http['timeout'] = 50;

$ctx = stream_context_create(array(

'http' => $http,

));
$content = @file_get_contents($url, 0, $ctx);
sleep (1);

if (!$content) {

return false;

}

$tmpfile = tempfile();

file_put_contents($tmpfile, $content);

         return $tmpfile;

}

function tempfile()

{

    $path = dirname(__FILE__);
   $path .= '/spider/’ . date('Ymd') . '/'.date('His ').'-' . (int)(time() / 300);

if (!file_exists($path)) {

mkdir($path, 0777, true);

}

                                                                                                                                                                                                       

touch($file);

        return $file;
}

Image processing source code (official website address: http://www.white-hat-web-design.co.uk/blog/resizing-images-with-php/):

Copy code

The code is as follows:

/*
* 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);
        }

        if (!$this->image) {
            return false;
        }

        return $this;
    }

    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($width) {
        if ($this->getWidth() < $width) {
            $width = $this->getWidth();
        }
        $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;
    }

 
    function resize2($width,$height) {
        $new_image = imagecreatetruecolor($width, $height);
        if( $this->image_type == IMAGETYPE_GIF || $this->image_type == IMAGETYPE_PNG ) {
            $current_transparent = imagecolortransparent($this->image);
            if($current_transparent != -1) {
                $transparent_color = imagecolorsforindex($this->image, $current_transparent);
                $current_transparent = imagecolorallocate($new_image, $transparent_color['red'], $transparent_color['green'], $transparent_color['blue']);
                imagefill($new_image, 0, 0, $current_transparent);
                imagecolortransparent($new_image, $current_transparent);
            } elseif( $this->image_type == IMAGETYPE_PNG) {
                imagealphablending($new_image, false);
                $color = imagecolorallocatealpha($new_image, 0, 0, 0, 127);
                imagefill($new_image, 0, 0, $color);
                imagesavealpha($new_image, true);
            }
        }
        imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());
        $this->image = $new_image;  
    }

}

http://www.bkjia.com/PHPjc/751937.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/751937.htmlTechArticle使用方法示例： 设定宽度，等比例缩放 复制代码 代码如下: ?php include('SimpleImage.php'); $image = new SimpleImage(); $image-load('picture.jpg'); $image-resi...