php封装成类（GD库实现文字、图片水印、压缩图）

<?php require('image_class.php');$src = 'tmp.jpg';$font_url = 'msyh.ttc';$logo_url = 'logo.png';$content = 'Hello world';$local = array(    'x'=> 20,    'y'=> 30    );$color = array(    0 => 255,    1 => 255,    2 => 255,    3 => 20    );$fontsize = 20;$angle = -30;$alpha = 30;$image = new Image($src);$image->fontmark($font_url,$content,$local,$color,$angle,$fontsize);$image->imagemark($logo_url,$local,$alpha);$image->thumb(150,100);$image->show();$image->move('imagemark');

?>

image_class.php

<?php     class Image{        //图片属性        private $image;        private $info;        //构造图片方法        public function __construct($src){            $info = getimagesize($src);            $this->info = array(                'width'=> $info[0],                'height'=> $info[1],                'type'=> image_type_to_extension($info[2], false),                'mime'=> $info['mime'],                );                            //在内存中创建一个同类型的图像            $fun = "imagecreatefrom{$this->info['type']}"; //imagecreatefromjpeg                //把图片复制到我们的内存            $this->image = $fun($src); //imagecreatefromjpeg($src);        }        //压缩图片方法        public function thumb($width, $height){            $image_thumb = imagecreatetruecolor($width, $height);                //核心步骤，将原图复制到真彩色图像,按照一定比例压缩            imagecopyresampled($image_thumb, $this->image, 0, 0, 0, 0, $width, $height, $this->info['width'], $this->info['height']);            imagedestroy($this->image);            $this->image = $image_thumb;                //销毁图片          //  imagedestroy($image_thumb);   //地址一致，不能销毁        }        //文字水印方法        public function fontmark($font_url,$content,$local,$color,$angle,$fontsize){                //设置字体颜色和透明度 参数1 内存中的图片 RGB参数            $col = imagecolorallocatealpha($this->image, $color[0], $color[1], $color[2], $color[3]);                //写入文字            imagettftext($this->image, $fontsize, $angle, $local['x'], $local['y'], $col, $font_url, $content);        }        //图片水印方法        public function imagemark($logo_url,$local,$alpha){                //获取图片信息            $info2 = getimagesize($logo_url);                //通过图片的编号取得图片的类型            $type_logo = image_type_to_extension($info2[2], false);                //在内存中创建一个同类型的图像            $funs = "imagecreatefrom{$type_logo}"; //imagecreatefromjpeg                //把水印复制到我们的内存            $water = $funs($logo_url); //imagecreatefromjpeg($src);                //合并图像            //imagecopymerge($image, $water, 20, 30, 0, 0, $info2[0], $info2[1], 25);            $this-> imagecopymerge_alpha($this->image, $water, $local['x'], $local['y'], 0, 0, $info2[0], $info2[1],$alpha);                 //销毁水印            imagedestroy($water);          }          //解决imagecopy、imagecopymerge的合并方案(兼容方法)        public function imagecopymerge_alpha($dst_im, $src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct){                $cut = imagecreatetruecolor($src_w, $src_h);                imagecopy($cut, $dst_im, 0, 0, $dst_x, $dst_y, $src_w, $src_h);                imagecopy($cut, $src_im,0, 0, $src_x, $src_y, $src_w, $src_h);                imagecopymerge($dst_im, $cut, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $pct);                }        /*输出图片到浏览器*/        public function show(){            header("content-type:".$this->info['mime']);            $func = "image{$this->info['type']}";            $func($this->image);                              }        /*输出图片到磁盘*/        public function move($newname){            header("content-type:".$this->info['mime']);            $func = "image{$this->info['type']}";            $func($this->image,$newname.'.'.$this->info['type']);        }        /*销毁图片*/        public function __destruct(){            imagedestroy($this->image);        }    }?>