php图片处理

图片处理的四个步骤

<?php
/**
* Created by PhpStorm.
* User: leyan
* Date: 2016/6/10
* Time: 19:42
*/
require_once('image_interface.php');

class image implements image_face{

private $info = array();//图片详细信息
var $type = '';//图片类型
private $image = '';//内存中的图片
var $font = 'images/msyh.ttf';//水印字体
var $image_mark = "images/logo.jpeg";//水印图片
var $image_thumb = '';
var $thumb = false;//销毁缩略图

function __construct($src)
{
$version = $this->check_gd();
if($version == 0){
exit('gd版本不存在');
}

/*1.打开图片*/
//2.获取图片信息
$this->info = getimagesize($src);
//3.通过图像的编号来获取图像的类型
$this->type = image_type_to_extension($this->info[2],false);//jpeg
//4.在内存中创建一个和我们图像类型一样的图像
$fun = "imagecreatefrom{$this->type}";
//imagecreatefromjpeg($src);imagecreatefrompng($src);
$this->image = $fun($src);
}

//文字水印
function add_watermark_character($content){
/*二.操作图片*/
//1.设置字体库的路径

//2.填写水印的内容

//3.设置字体的颜色和透明度
$col = imagecolorallocatealpha($this->image,255,255,255,50);
//4.写入文字
imagettftext($this->image,30,0,20,70,$col,$this->font,$content);

}

/**图片水印
* @param $image_mark
*/
function add_watermark_pic($image_mark='')
{
/*二.操作图片*/
if(!empty($image_mark)){
$this->image_mark = $image_mark;
}
$info2 = getimagesize($this->image_mark);
$type2 = image_type_to_extension($info2[2],false);
$func2 = "imagecreatefrom{$type2}";
$water = $func2($this->image_mark);

//合并图片
imagecopymerge($this->image,$water,20,70,0,0,$info2[0],$info2[1],100);

}
//缩略图
function add_watermark_thumb($width=300,$height=200){
$this->image_thumb = imagecreatetruecolor($width,$height);
imagecopyresampled($this->image_thumb,$this->image,0,0,0,0,$width,$height,$this->info[0],$this->info[1]);
//销毁原始图片
imagedestroy($this->image);
$this->thumb = true;

}

//检测gd库的版本
function check_gd(){
if(!extension_loaded('gd')){
exit('gb库未加载');
}
if(PHP_VERSION>4.3){
if(function_exists('gd_info')){
$ver_info = gd_info();
preg_match('/\d/',$ver_info['GD Version'],$match);
return $match[0];
}
}
}

//保存以及销毁图片
public function __destruct()
{
// TODO: Implement __destruct() method.
/*三.输出图片*/
//1.浏览器输出（显示图片）
header('Content-type:'.$this->info['mime']);
$func = "image{$this->type}";
if($this->thumb){
//保存和销毁的图片是缩略图
$this->image = $this->image_thumb;
}
$func($this->image);

//2.保存图片到硬盘
$func($this->image,"images/newimage.{$this->type}");
/*四.销毁图片*/
imagedestroy($this->image);
}
}

#测试用例
$img = new image('images/pic.jpg');
$img -> add_watermark_pic();