经典的 PHP 图像处理类

<?php
/* 
图片处理类：缩略，裁剪，圆角，倾斜 
*/
class resizeimage
{
    //图片类型 
    var $type;
    //实际宽度 
    var $width;
    //实际高度 
    var $height;
    //改变后的宽度 
    var $resize_width;
    //改变后的高度 
    var $resize_height;
    //是否裁图 
    var $cut;
    //源图象 
    var $srcimg;
    //目标图象地址 
    var $dstimg;
    //圆角源 
    var $corner;
    var $im;
    
    function resizeimage($img, $corner, $wid, $hei, $c, $corner_radius, $angle)
    {
        $this->srcimg        = $img;
        $this->corner        = $corner;
        $this->resize_width  = $wid;
        $this->resize_height = $hei;
        $this->cut           = $c;
        $this->corner_radius = $corner_radius;
        $this->angle         = $angle;
        //图片的类型 
        $this->type          = substr(strrchr($this->srcimg, "."), 1);
        //初始化图象 
        $this->initi_img();
        //目标图象地址 
        $this->dst_img();
        //-- 
        $this->width  = imagesx($this->im);
        $this->height = imagesy($this->im);
        //生成图象 
        $this->newimg();
        ImageDestroy($this->im);
    }
    function newimg()
    {
        //改变后的图象的比例 
        $resize_ratio = ($this->resize_width) / ($this->resize_height);
        //实际图象的比例 
        $ratio        = ($this->width) / ($this->height);
        if (($this->cut) == "1")
        //裁图 
            {
            if ($ratio >= $resize_ratio)
            //高度优先 
                {
                $newimg = imagecreatetruecolor($this->resize_width, $this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, (($this->height) * $resize_ratio), $this->height);
                $tmp = $this->rounded_corner($newimg, $this->resize_width);
                imagepng($tmp, $this->dstimg);
            }
            if ($ratio < $resize_ratio)
            //宽度优先 
                {
                $newimg = imagecreatetruecolor($this->resize_width, $this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width) / $resize_ratio));
                $tmp = $this->rounded_corner($newimg);
                imagepng($tmp, $this->dstimg);
            }
        } else
        //不裁图 
            {
            if ($ratio >= $resize_ratio) {
                $newimg = imagecreatetruecolor($this->resize_width, ($this->resize_width) / $ratio);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width) / $ratio, $this->width, $this->height);
                ImageJpeg($newimg, $this->dstimg);
            }
            if ($ratio < $resize_ratio) {
                $newimg = imagecreatetruecolor(($this->resize_height) * $ratio, $this->resize_height);
                imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height) * $ratio, $this->resize_height, $this->width, $this->height);
                ImageJpeg($newimg, $this->dstimg);
            }
        }
    }
    //初始化图象 
    function initi_img()
    {
        if ($this->type == "jpg") {
            $this->im = imagecreatefromjpeg($this->srcimg);
        }
        if ($this->type == "gif") {
            $this->im = imagecreatefromgif($this->srcimg);
        }
        if ($this->type == "png") {
            $this->im = imagecreatefrompng($this->srcimg);
        }
    }
    
    //处理圆角 
    function rounded_corner($image, $size)
    {
        $topleft        = true;
        $bottomleft     = true;
        $bottomright    = true;
        $topright       = true;
        $corner_source  = imagecreatefrompng('rounded_corner.png');
        $corner_width   = imagesx($corner_source);
        $corner_height  = imagesy($corner_source);
        $corner_resized = ImageCreateTrueColor($this->corner_radius, $this->corner_radius);
        ImageCopyResampled($corner_resized, $corner_source, 0, 0, 0, 0, $this->corner_radius, $this->corner_radius, $corner_width, $corner_height);
        $corner_width  = imagesx($corner_resized);
        $corner_height = imagesy($corner_resized);
        $white         = ImageColorAllocate($image, 255, 255, 255);
        $black         = ImageColorAllocate($image, 0, 0, 0);
        
        //顶部左圆角 
        if ($topleft == true) {
            $dest_x = 0;
            $dest_y = 0;
            imagecolortransparent($corner_resized, $black);
            imagecopymerge($image, $corner_resized, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100);
        }
        
        //下部左圆角 
        if ($bottomleft == true) {
            $dest_x  = 0;
            $dest_y  = $size - $corner_height;
            $rotated = imagerotate($corner_resized, 90, 0);
            imagecolortransparent($rotated, $black);
            imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100);
        }
        
        //下部右圆角 
        if ($bottomright == true) {
            $dest_x  = $size - $corner_width;
            $dest_y  = $size - $corner_height;
            $rotated = imagerotate($corner_resized, 180, 0);
            imagecolortransparent($rotated, $black);
            imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100);
        }
        
        //顶部右圆角 
        if ($topright == true) {
            $dest_x  = $size - $corner_width;
            $dest_y  = 0;
            $rotated = imagerotate($corner_resized, 270, 0);
            imagecolortransparent($rotated, $black);
            imagecopymerge($image, $rotated, $dest_x, $dest_y, 0, 0, $corner_width, $corner_height, 100);
        }
        $image = imagerotate($image, $this->angle, $white);
        return $image;
    }
    
    //图象目标地址 
    function dst_img()
    {
        $full_length  = strlen($this->srcimg);
        $type_length  = strlen($this->type);
        $name_length  = $full_length - $type_length;
        $name         = substr($this->srcimg, 0, $name_length - 1);
        $this->dstimg = $name . "_small.png";
    }
}

//resizeimage("图片地址", "处理后的宽度", "处理后的高度", "是否裁剪", "圆角度数", "倾斜度"); 
$img_file    = 'Sunset.jpg';
$corner      = 'rounded_corner.png';
$resizeimage = new resizeimage($img_file, $corner, "80", "80", "1", "6", "0");
?> 
<img src="Sunset_small.png" border="0">