《PHP编程最快明白》第七讲:php图片验证码与缩略图_php基础_脚本之家

选用办法亲自过问:
设定宽度,等比例缩放

实例22 图片表达的基本代码 复制代码
代码如下:
那么些是出口4个验证码的例子,对于汉字,必要font文件和imagettftext函数,用到的时候大家再网络检索吧。你要爆发随机数,那有mt_rand函数;你还要用到session保存那几个自由数;借使急需转成utf-8,要求iconv函数。
实例23 缩略图 复制代码 代码如下:
image_type = $image_info[2]; if( $this->image_type ==
IMAGETYPE_JPEG ) { $this->image = imagecreatefromjpeg; } elseif(
$this->image_type == IMAGETYPE_GIF ) { $this->image =
imagecreatefromgif; } elseif( $this->image_type == IMAGETYPE_PNG )
{ $this->image = imagecreatefrompng; } } function save($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; } elseif( $image_type == IMAGETYPE_GIF
) { imagegif; } elseif( $image_type == IMAGETYPE_PNG ) { imagepng; } }
function getWidth() { return imagesx; } function getHeight() { return
imagesy; } function resizeToHeight { $ratio = $height /
$this->getHeight(); $width = $this->getWidth() * $ratio;
$this->resize; } function resizeToWidth { $ratio = $width /
$this->getWidth(); $height = $this->getheight() * $ratio;
$this->resize; } function scale { $width = $this->getWidth() *
$scale/100; $height = $this->getheight() * $scale/100;
$this->resize; } function resize { $new_image =
imagecreatetruecolor; imagecopyresampled($new_image, $this->image,
0, 0, 0, 0, $width, $height, $this->getWidth); $this->image =
$new_image; } } $newfile =
UPLOAD_DIR.”/icons/”.md5($_SESSION[‘USER’]->email卡塔尔.”.jpg”;//上传文件保留的目录
$image = new SimpleImage(State of Qatar;
$image->load($_FILES[‘icons’][‘tmp_name’]卡塔尔(قطر‎;//上传的不时文件名
$image->resizeToWidth;设置宽度 $image->save; ?>

复制代码 代码如下:

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

设定中度,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->resizeToHeight(500);
   $image->save(‘picture2.jpg’);
   $image->resizeToHeight(200);
   $image->save(‘picture3.jpg’);?>

按比例,缩放至50%

复制代码 代码如下:

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

缩放后直接出口到荧屏

复制代码 代码如下:

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

使用例子:

复制代码 代码如下:

<?php
include(“SimpleImage.php”卡塔尔国;//图片处理类在上面

$url=””;
$picfile =
down($url卡塔尔;//下载图片(下载图片的门径能够拍卖完了后清空,这里未开展管理)
$res = new SimpleImage(卡塔尔(قطر‎;//图片管理实例
$res = $res->load($picfile);
$tmpfile = tempfile(卡塔尔.’.jpg’;//成立一个渠道文件用来保存图片
$width = ’30’;//设定图片的肥瘦
$res->resizeToWidth($width);
$res->save($tmpfile卡塔尔(قطر‎;//把拍卖后的图样保存(无.jpg后缀)
//这里一齐产生了3个文件,一个是下载的图片文件,贰个是有的时候文件,最终一个是管理的图纸文件。须求优化清理掉前五个文件。

 

function down($url)
{
        $http = array();
        $header = “”;
        if ($header) {
            $http[‘header’] = $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);
        }

        do {
            $file = $path . ‘/’ . dechex(mt_rand());
        }
        while (file_exists($file));

        touch($file);

        return $file;
}

图表管理类源码(官方网站地址:

复制代码 代码如下:

<?php

/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link:

*
* 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:
*
*
*/

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;  
    }

}

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