PHP Thumbnail Implementation function code

Array getimagesize (string $filename [, Array & $imageinfo]) to get the image size
Resource Imagecreatetruecolor (int $x _size, int $y _size) Create a new true color image
Resource Imagecreatefromjpeg (string $filename) Create a new image from a JPEG file or URL
BOOL Imagecopyresized (Resource $DST _image, resource $src _image, int $dst _x, int $dst _y, int $src _x, int $src _y, in T $dst _w, int $dst _h, int $src _w, int $src _h) copy part of the image and resize it
BOOL Imagejpeg (Resource $image [, String $filename [, int $quality]]) output images to a browser or file in JPEG format
The code is as follows:
<?php
/*
Created by <a href= "http://www.php1.cn/" >*/
File and Zoom dimensions
$imgfile = ' smp.jpg ';
$percent = 0.2;
Header (' Content-type:image/jpeg ');
List ($width, $height) = getimagesize ($imgfile);
$newwidth = $width * $percent;
$newheight = $height * $percent;
$thumb = Imagecreatetruecolor ($newwidth, $newheight);
$source = Imagecreatefromjpeg ($imgfile);
Imagecopyresized ($thumb, $source, 0, 0, 0, 0, $newwidth, $newheight, $width, $height);
Imagejpeg ($THUMB);
?>

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