php实现图片的操作，也就是裁切，跟加水印_PHP教程
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内容图文
class image {
protected $img;
protected $types = array(
1 => 'gif',
2 => 'jpg',
3 => 'png',
6 => 'bmp'
);
public function __construct($img=''){
!$img && $this->param($img);
}
public function param($img){
$this->img = $img;
return $this;
}
public function getImageInfo($img){
$info = @getimagesize($img);
if(isset($this->types[$info[2]])){
$info['ext'] = $info['type'] = $this->types[$info[2]];
} else{
$info['ext'] = $info['type'] = 'jpg';
}
$info['type'] == 'jpg' && $info['type'] = 'jpeg';
$info['size'] = @filesize($img);
return $info;
}
public function thumb($filename,$new_w=160,$new_h=120,$cut=0,$big=0){
$info = $this->getImageInfo($this->img);
if(!empty($info[0])) {
$old_w = $info[0];
$old_h = $info[1];
$type = $info['type'];
$ext = $info['ext'];
unset($info);
if($old_w < $new_h && $old_h < $new_w && !$big){
return false;
}
if($cut == 0){
$scale = min($new_w/$old_w, $new_h/$old_h);
$width = (int)($old_w*$scale);
$height = (int)($old_h*$scale);
$start_w = $start_h = 0;
$end_w = $old_w;
$end_h = $old_h;
} elseif($cut == 1){
$scale1 = round($new_w/$new_h,2);
$scale2 = round($old_w/$old_h,2);
if($scale1 > $scale2){
$end_h = round($old_w/$scale1,2);
$start_h = ($old_h-$end_h)/2;
$start_w = 0;
$end_w = $old_w;
} else{
$end_w = round($old_h*$scale1,2);
$start_w = ($old_w-$end_w)/2;
$start_h = 0;
$end_h = $old_h;
}
$width = $new_w;
$height= $new_h;
} elseif($cut == 2){
$scale1 = round($new_w/$new_h,2);
$scale2 = round($old_w/$old_h,2);
if($scale1 > $scale2){
$end_h = round($old_w/$scale1,2);
$end_w = $old_w;
} else{
$end_w = round($old_h*$scale1,2);
$end_h = $old_h;
}
$start_w = 0;
$start_h = 0;
$width = $new_w;
$height= $new_h;
}
$createFun = 'ImageCreateFrom'.$type;
$oldimg = $createFun($this->img);
if($type!='gif' && function_exists('imagecreatetruecolor')){
$newimg = imagecreatetruecolor($width, $height);
} else{
$newimg = imagecreate($width, $height);
}
if(function_exists("ImageCopyResampled")){
ImageCopyResampled($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);
} else{
ImageCopyResized($newimg, $oldimg, 0, 0, $start_w, $start_h, $width, $height, $end_w,$end_h);
}
$type == 'jpeg' && imageinterlace($newimg,1);
$imageFun = 'image'.$type;
!@$imageFun($newimg,$filename) && die("error!");
ImageDestroy($newimg);
ImageDestroy($oldimg);
return $filename;
}
return false;
}
public function water($filename,$water,$pos=0,$pct=80){//加水印
$info = $this->getImageInfo($water);
if(!empty($info[0])){
$water_w = $info[0];
$water_h = $info[1];
$type = $info['type'];
$fun = 'imagecreatefrom'.$type;
$waterimg = $fun($water);
} else{
return false;
}
$info = $this->getImageInfo($this->img);
if(!empty($info[0])){
$old_w = $info[0];
$old_h = $info[1];
$type = $info['type'];
$fun = 'imagecreatefrom'.$type;
$oldimg = $fun($this->img);
} else{
return false;
}
$water_w >$old_w && $water_w = $old_w;
$water_h >$old_h && $water_h = $old_h;
dump($waterimg);
dump($oldimg);
switch($pos){
case 0:
$posX = rand(0,($old_w - $water_w));
$posY = rand(0,($old_h - $water_h));
break;
case 1:
$posX = 0;
$posY = 0;
break;
case 2:
$posX = ($old_w - $water_w) / 2;
$posY = 0;
break;
case 3:
$posX = $old_w - $water_w;
$posY = 0;
break;
case 4:
$posX = 0;
$posY = ($old_h - $water_h) / 2;
break;
case 5:
$posX = ($old_w - $water_w) / 2;
$posY = ($old_h - $water_h) / 2;
break;
case 6:
$posX = $old_w - $water_w;
$posY = ($old_h - $water_h) / 2;
break;
case 7:
$posX = 0;
$posY = $old_h - $water_h;
break;
case 8:
$posX = ($old_w - $water_w) / 2;
$posY = $old_h - $water_h;
break;
case 9:
$posX = $old_w - $water_w;
$posY = $old_h - $water_h;
break;
default:
$posX = rand(0,($old_w - $water_w));
$posY = rand(0,($old_h - $water_h));
break;
}
imagealphablending($oldimg, true);
imagecopymerge($oldimg, $waterimg, $posX, $posY, 0, 0, $water_w,$water_h,$pct);
$fun = 'image'.$type;
!@$fun($oldimg, $filename) && die('error！');
imagedestroy($oldimg);
imagedestroy($waterimg);
return $filename;
}
}
?>
$img1 = './image/test.jpg';
$img2 = './image/test_new.jpg';
$water = './image/water.gif';
$img = new image();
$img->param($img1)->thumb('./image/test_0.jpg', 200,200,0);
$img->param($img1)->thumb('./image/test_1.jpg', 200,200,1);
$img->param($img1)->thumb('./image/test_2.jpg', 200,200,2);
$img->param($img1)->water($img2,$water,9);
?>
http://www.bkjia.com/PHPjc/478728.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/478728.htmlTechArticle? class image { protected $img; protected $types = array( 1 = gif, 2 = jpg, 3 = png, 6 = bmp ); public function __construct($img=){ !$img $this-param($img); } public function param...
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