Generate image thumbnails with PHP_PHP tutorial

PHP generates image thumbnails:

To use PHP to generate image thumbnails, make sure your PHP server has the GD2 graphics library installed

Use a class to generate thumbnails of images. See the source code of the class below

Call the method of this class:

resizeimage = new resizeimage("image source file address", "200", "100", "0", "thumbnail address");

//Just use the above sentence to generate a thumbnail. The source file and thumbnail addresses can be the same, 200 and 100 represent the width and height respectively

//Use the following class to generate image thumbnails,

class resizeimage

　{

//Image type

　var type;

　//Actual width

　var width;

//Actual height

　var height;

//Changed width

var resize_width;

//Height after change

var resize_height;

//Whether to crop the image

　var cut;

//Source image

　var srcimg;

//Target image address

var dstimg;

//Temporarily created image

　var im;

Function resizeimage(img, wid, hei,c,dstpath)

　{

this->srcimg = img;

　this->resize_width = wid;

　this->resize_height = hei;

this->cut = c;

//Type of image

　this->type = strtolower(substr(strrchr(this->srcimg,"."),1));

//Initialize image

This->initi_img();

//Target image address

　this -> dst_img(dstpath);

　//--

this->width = imagesx(this->im);

　this->height = imagesy(this->im);

//Generate image

This->newimg();

ImageDestroy (this->im);

　}

Function newimg()

　{

//The proportion of the changed image

resize_ratio = (this->resize_width)/(this->resize_height);

//Proportion of actual image

ratio = (this->width)/(this->height);

　if((this->cut)=="1")

　//Cut image

　{

　if(ratio>=resize_ratio)

// High priority

　{

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 );

ImageJpeg (newimg,this->dstimg);

　}

　if(ratio

//Breadth priority

　{

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) );

ImageJpeg (newimg,this->dstimg);

　}

　}

else

//No cropping

　{

　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

　{

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);

　}

　}

　}

//Initialize image

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);

　}

　}

//Image target address

Function dst_img(dstpath)

　{

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 = dstpath;

//echo this->dstimg;

　}

　}

　?>

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