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-蒲公英云

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);