01// 剪切图片

02function cut_img($src_image, $out_image = null, int $new_width = null, int $new_height = null, $img_quality = 90)

03{

04    // 输出地址

05    if (! $out_image)

06        $out_image = $src_image;

07     

08    // 读取配置文件设置

09    if (! $new_width && ! $new_height)

10        return;

11     

12    // 获取图片属性

13    list ($width, $height, $type, $attr) = getimagesize($src_image);

14    switch ($type) {

15        case 1:

16            $img = imagecreatefromgif($src_image);

17            break;

18        case 2:

19            $img = imagecreatefromjpeg($src_image);

20            break;

21        case 3:

22            $img = imagecreatefrompng($src_image);

23            break;

24    }

25     

26    // 不限定是等比例缩放

27    if (! $new_width) {

28        $new_width = floor($width * ($new_height / $height));

29    }

30    if (! $new_height) {

31        $new_height = floor($height * ($new_width / $width));

32    }

33    // 创建画布

34    $new_img = imagecreatetruecolor($new_width, $new_height);

35     

36    // 创建透明画布,避免黑色

37    if ($type == 1 || $type == 3) {

38        $color = imagecolorallocate($new_img, 255, 255, 255);

39        imagefill($new_img, 0, 0, $color);

40        imagecolortransparent($new_img, $color);

41    }

42 

43 

44    // 先缩放

45    $scale = max($new_width / $width, $new_height / $height);

46    $scale_width = floor($scale * $width);

47    $scale_height = floor($scale * $height);

48    $scale_img = imagecreatetruecolor($scale_width, $scale_height); // 创建画布

49    if(function_exists("ImageCopyResampled")) {

50       imagecopyresampled($scale_img, $img, 0, 0, 0, 0, $scale_width, $scale_height, $width, $height);

51    } else {

52       imagecopyresized($scale_img, $img, 0, 0, 0, 0, $scale_width, $scale_height, $width, $height);

53    }

54    //再裁剪

55    $start_x = ($scale_width - $new_width) / 2;

56    $start_y = ($scale_height - $new_height) / 2;

57 

58    //拷贝剪切的图像数据到画板，生成剪切图像

59    imagecopy($new_img, $scale_img, 0, 0, $start_x, $start_y, $scale_width, $scale_height);

60 

61    check_dir(dirname($out_image), true); // 检查输出目录

62     

63    switch ($type) {

64        case 1:

65            imagegif($new_img, $out_image, $img_quality);

66            break;

67        case 2:

68            imagejpeg($new_img, $out_image, $img_quality);

69            break;

70        case 3:

71            imagepng($new_img, $out_image, $img_quality / 10); // $quality参数取值范围0-99 在php 5.1.2之后变更为0-9

72            break;

73        default:

74            imagejpeg($new_img, $out_image, $img_quality);

75    }

76    imagedestroy($new_img);

77    imagedestroy($img);

78    return true;

79}

查看源码打印代码帮助

1{pboot:list scode=*}

2<a href= "[list:link]"><img src="[list:ico width=600 height=400]" /></a>

3{/pboot:list}