php 缩略图不生成文件夹,手机照片不能生成缩略图问题以及解决方案

缺乏、安全感 2023-01-13 05:59 135阅读 0赞

跳至//获取真实的图片类型

list($width, $height, $type, $attr) = getimagesize($this->sur\_file);

switch($type) \{

case 1 :

$img\_type = 'gif';

break;

case 2 :

$img\_type = 'jpeg';

break;

case 3 :

$img\_type = 'png';

break;

case 15 :

$img\_type = 'wbmp';

break;

default :

return false;

//下面把修改后的生成缩略图的类贴出来，供大家指正~

/\*\*

\* php生成缩略图类

\* 修改者 点点细雨

\* 文章出处 ： http://blog.csdn.net/diandianxiyu\_geek

\* 2014-07-23 解决了图片类型不能正常识别的问题

\*/

class thumb \{

public $sur\_file; //读取的原图片

public $des\_file; //生成目标图片

public $tem\_file; //临时图片

public $tag; //缩略标签 0,默认,按固定的高宽生成 1,按比列或固定最大长度生成 -1,按某个宽度或某个高度缩小

public $resize\_width; //$tag为0时,目标文件宽

public $resize\_height; //$tag为0时,目标文件高

public $sca\_max; //$tag为1时,<0$sca\_max1时为最大长度(高或宽之中的最大值)

public $type; //图片类型

public $width; //原图片宽

public $height; //原图片高

public $size; //原图大小

//构造函数

public function \_\_construct($surpic, $reswid, $reshei, $despic, $mark, $scamax) \{

$this->sur\_file = $surpic;

$this->resize\_width = $reswid;

$this->resize\_height = $reshei;

$this->tag = $mark;

$this->sca\_max = $scamax;

list($width, $height, $type, $attr) = getimagesize($this->sur\_file);

switch ($type) \{

case 1 :

$img\_type = 'gif';

break;

case 2 :

$img\_type = 'jpeg';

break;

case 3 :

$img\_type = 'png';

break;

case 15 :

$img\_type = 'wbmp';

break;

default :

return false;

$this->type = $img\_type; //获取图片类型

$this->init\_img(); //初始化图片

$this->des\_file = $despic; //目标图片地址

$this->width = $width;

$this->height = $height;

$this->size = filesize($surpic);

$this->new\_img();

imagedestroy($this->tem\_file);

//图片初始化函数

private function init\_img() \{

if ($this->type == 'jpeg') \{

$this->tem\_file = imagecreatefromjpeg($this->sur\_file);

\} elseif ($this->type == 'jpg') \{

$this->tem\_file = imagecreatefromjpeg($this->sur\_file);

\} elseif ($this->type == 'gif') \{

$this->tem\_file = imagecreatefromgif($this->sur\_file);

\} elseif ($this->type == 'png') \{

$this->tem\_file = imagecreatefrompng($this->sur\_file);

\} elseif ($this->type == 'bmp') \{

$this->tem\_file = imagecreatefrombmp($this->sur\_file); //bmp.php中包含

//图片生成函数

private function new\_img() \{

$ratio = ($this->width) / ($this->height); //原图比例

$resize\_ratio = ($this->resize\_width) / ($this->resize\_height); //缩略后比例

$newimg = imagecreatetruecolor($this->resize\_width, $this->resize\_height); //生成新图片

imagealphablending($newimg, false); //这里很重要,意思是不合并颜色,直接用$img图像颜色替换,包括透明色;

imagesavealpha($newimg, true);

if ($this->tag == 0) \{ //按固定高宽截取缩略图

$newimg = imagecreatetruecolor($this->resize\_width, $this->resize\_height); //生成新图片

if ($ratio >= $resize\_ratio) \{//即等比例下,缩略图的高比原图长,因此高不变

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, $this->resize\_width, $this->resize\_height, (($this->height) \* $resize\_ratio), $this->height);

\} elseif ($ratio < $resize\_ratio) \{//即等比例下,缩略图的宽比原图长,因此宽不变

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, $this->resize\_width, $this->resize\_height, $this->width, (($this->width) / $resize\_ratio));

\} elseif ($this->tag == 1) \{ //按固定比例或最大长度缩小

if ($this->sca\_max < 1) \{ //按比例缩小

$newimg = imagecreatetruecolor((($this->width) \* ($this->sca\_max)), (($this->height) \* ($this->sca\_max))); //生成新图片

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, (($this->width) \* ($this->sca\_max)), (($this->height) \* ($this->sca\_max)), $this->width, $this->height);

\} elseif ($this->sca\_max > 1) \{ //按某个最大长度缩小

if ($ratio >= 1) \{ //宽比高长

$newimg = imagecreatetruecolor($this->sca\_max, ($this->sca\_max / $ratio)); //生成新图片

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, $this->sca\_max, ($this->sca\_max / $ratio), $this->width, $this->height);

\} else \{

$newimg = imagecreatetruecolor(($this->sca\_max \* $ratio), $this->sca\_max); //生成新图片

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, ($this->sca\_max \* $ratio), $this->sca\_max, $this->width, $this->height);

\} elseif ($this->tag == -1) \{ //按某个宽度或某个高度缩小

if ($resize\_ratio >= 1) \{//新高小于新宽,则图片按新宽度缩小

$newimg = imagecreatetruecolor($this->resize\_width, ($this->resize\_width / $ratio)); //生成新图片

imagecopyresampled($newimg, $this->tem\_file, 0, 0, 0, 0, $this->resize\_width, ($this->resize\_width / $ratio), $this->width, $this->height);

\} elseif ($resize\_ratio < 1) \{//新宽小于新高,则图片按新高度缩小