Function used to generate a thumbnail when uploading an image

Introduction: This is a detailed page of functions used to generate thumbnail images when uploading images. It introduces PHP, related knowledge, skills, experience, and some PHP source code.

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Author/Source: keniv

Function used to generate a thumbnail when uploading an image

Practical application see http://feifei2.bjedu.gov.cn/cgi-bin/funnymovie.php

// There are many funny movies

// This function extracts the image from the source file, sets it to the specified size, and outputs it to the target file.

// Source file format: GIF, JPG, and PNG

// Target file format: JPG

// $ Srcfile: source file

// $ Dstfile: target file

// $ Dstw: Target Image Width

// $ DTH: height of the target file

Function makethumb ($ srcfile, $ dstfile, $ dstw, $ dsomething ){

$ DATA = getimagesize ($ srcfile, & $ info );

Switch ($ data [2]) {

Case 1:

$ Im = @ imagecreatefromgif ($ srcfile );

Break;

Case 2:

$ Im = @ imagecreatefromjpeg ($ srcfile );

Break;

Case 3:

$ Im = @ imagecreatefrompng ($ srcfile );

Break;

}

$ Srcw = imagesx ($ IM );

$ Srch = imagesy ($ IM );

$ Ni = imagecreate ($ dstw, $ dsomething );

Imagecopyresized ($ Ni, $ im, 0, 0, 0, $ dstw, $ dsomething, $ srcw, $ srch );

Imagejpeg ($ Ni, $ dstfile );

// If You Need to output data to the browser, change the previous sentence to imagejpeg ($ Ni );

// If you need images in other formats, you can change the last sentence.

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