PHP Generate picture Thumbnail class program

Source: Internet
Author: User
Tags eval fread imagejpeg ord pack strlen unpack

You can generate thumbnail images using the following classes,

The code is as follows Copy Code

<?php
Class Resizeimage
{
Picture type
var $type;
Actual width
var $width;
Actual height
var $height;
The width after the change
var $resize _width;
Change the height of the post
var $resize _height;
Whether or not to cut the map
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 picture

$this->type = Strtolower (substr (STRRCHR ($this->srcimg, "."), 1);

Initializing images
$this->initi_img ();
Target Image Address
$this-> dst_img ($dstpath);
//--
$this->width = imagesx ($this->im);
$this->height = Imagesy ($this->im);
Build image
$this->newimg ();
Imagedestroy ($this->im);
}
function newimg ()
{
The proportions of the altered image
$resize _ratio = ($this->resize_width)/($this->resize_height);
The proportions of the actual image
$ratio = ($this->width)/($this->height);
if (($this->cut) = = "1")
Drawing
{
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 < $resize _ratio)
Width first
{
$newimg = Imagecreatetruecolor ($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, $this->dstimg);
}
}
Else
Do not cut the figure
{
if ($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 < $resize _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, $this->dstimg);
}
}
}
Initializing images
function initi_img ()
{
if ($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 Destination 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;
}
}
?>

Call method of Class

$resizeimage = new Resizeimage ("Picture source file Address", "200", "100", "0", "thumbnail address");

Just use the words above, you can generate thumbnails, where the source file and thumbnail address can be the same, 200,100 representing width and height

Instance 2

PHP thumbnail, such as scale lossless compression, can fill the blank area to complement the color

The code is as follows Copy Code

<?php
Error_reporting (E_all);

Test
Imagezoom (' 1.jpg ', ' 2.jpg ', ', ', ' #FFFFFF ');

/*
PHP thumbnail function:
Equal scale lossless compression, can fill supplementary color author: Andy
Hosting Format:
BMP, JPG, GIF, png
Param
@srcimage: Picture to shrink
@dstimage: Pictures to save
@dst_width: Narrow The width
@dst_height: Reduce the height
@backgroundcolor: Supplemental color such as: #FFFFFF support 6-bit does not support 3-bit
*/
function Imagezoom ($srcimage, $dstimage, $dst _width, $dst _height, $backgroundcolor) {

File name garbled in
if (Php_os = = ' WINNT ') {
$srcimage = Iconv (' UTF-8 ', ' GBK ', $srcimage);
$dstimage = Iconv (' UTF-8 ', ' GBK ', $dstimage);
}

$dstimg = Imagecreatetruecolor ($dst _width, $dst _height);
$color = Imagecolorallocate ($dstimg
, Hexdec (substr ($backgroundcolor, 1, 2))
, Hexdec (substr ($backgroundcolor, 3, 2))
, Hexdec (substr ($backgroundcolor, 5, 2))
);
Imagefill ($dstimg, 0, 0, $color);

if (! $arr =getimagesize ($srcimage)) {
echo "The file to generate the thumbnail does not exist";
Exit
}

$SRC _width = $arr [0];
$SRC _height = $arr [1];
$srcimg = null;
$method = Getcreatemethod ($srcimage);
if ($method) {
Eval (' $srcimg = '. $method. ';' );
}

$DST _x = 0;
$DST _y = 0;
$DST _w = $dst _width;
$DST _h = $dst _height;
if (($dst _width/$dst _height-$src _width/$src _height) > 0) {
$DST _w = $src _width * ($dst _height/$src _height);
$DST _x = ($dst _width-$dst _w)/2;
} elseif (($dst _width/$dst _height-$src _width/$src _height) < 0) {
$DST _h = $src _height * ($dst _width/$src _width);
$DST _y = ($dst _height-$dst _h)/2;
}

Imagecopyresampled ($dstimg, $srcimg, $dst _x
, $dst _y, 0, 0, $dst _w, $dst _h, $src _width, $src _height);

Save format
$arr = Array (
' jpg ' => ' imagejpeg '
, ' jpeg ' => ' imagejpeg '
, ' png ' => ' imagepng '
, ' gif ' => ' imagegif '
, ' BMP ' => ' imagebmp '
);
$suffix = Strtolower (Array_pop (Explode ('. ', $dstimage)));
if (!in_array ($suffix, Array_keys ($arr)) {
echo "Saved filename is wrong";
Exit
} else {
Eval ($arr [$suffix]. ' ($dstimg, "'. $dstimage; ');
}

Imagejpeg ($dstimg, $dstimage);

Imagedestroy ($DSTIMG);
Imagedestroy ($SRCIMG);

}


function Getcreatemethod ($file) {
$arr = Array (
' 474946 ' => ' imagecreatefromgif (' $file ')
, ' ffd8ff ' => ' imagecreatefromjpeg (' $file ')
, ' 424D ' => ' imagecreatefrombmp (' $file ')
, ' 89504E ' => ' imagecreatefrompng (' $file ')
);
$FD = fopen ($file, "RB");
$data = Fread ($FD, 3);

$data = Str2hex ($data);

if (Array_key_exists ($data, $arr)) {
return $arr [$data];
} elseif (Array_key_exists (substr ($data, 0, 4), $arr)) {
return $arr [substr ($data, 0, 4)];
} else {
return false;
}
}

function Str2hex ($STR) {
$ret = "";

for ($i = 0; $i < strlen ($STR); $i + +) {
$ret. = Ord ($str [$i]) >= 16? Strval (Dechex) (Ord ($str [$i]))
: ' 0 '. Strval (Dechex (Ord ($str [$i]));
}

Return Strtoupper ($ret);
}

BMP creation function PHP itself without
function Imagecreatefrombmp ($filename)
{
if (! $f 1 = fopen ($filename, "RB") return FALSE;

$FILE = Unpack ("Vfile_type/vfile_size/vreserved/vbitmap_offset", Fread ($f 1,14));
if ($FILE [' File_type ']!= 19778) return FALSE;

$BMP = Unpack (' Vheader_size/vwidth/vheight/vplanes/vbits_per_pixel ').
'/vcompression/vsize_bitmap/vhoriz_resolution '.
'/vvert_resolution/vcolors_used/vcolors_important ', fread ($f 1,40));
$BMP [' colors '] = POW (2, $BMP [' bits_per_pixel ']);
if ($BMP [' size_bitmap '] = = 0) $BMP [' size_bitmap '] = $FILE [' file_size ']-$FILE [' Bitmap_offset '];
$BMP [' bytes_per_pixel '] = $BMP [' Bits_per_pixel ']/8;
$BMP [' bytes_per_pixel2 '] = ceil ($BMP [' bytes_per_pixel ']);
$BMP [' decal '] = ($BMP [' width ']* $BMP [' Bytes_per_pixel ']/4);
$BMP [' decal ']-= Floor ($BMP [' width ']* $BMP [' Bytes_per_pixel ']/4);
$BMP [' decal '] = (4* $BMP [' decal ']);
if ($BMP [' decal '] = = 4) $BMP [' decal '] = 0;

$PALETTE = Array ();
if ($BMP [' Colors '] < 16777216)
{
$PALETTE = Unpack (' V '. $BMP [' colors '], fread ($f 1, $BMP [' Colors ']*4)];
}

$IMG = Fread ($f 1, $BMP [' Size_bitmap ']);
$VIDE = chr (0);

$res = Imagecreatetruecolor ($BMP [' width '], $BMP [' height ']);
$P = 0;
$Y = $BMP [' Height ']-1;
while ($Y >= 0)
{
$X = 0;
while ($X < $BMP [' width '])
{
if ($BMP [' bits_per_pixel '] = = 24)
$COLOR = Unpack ("V", substr ($IMG, $P, 3). $VIDE);
ElseIf ($BMP [' bits_per_pixel '] = = 16)
{
$COLOR = Unpack ("n", substr ($IMG, $P, 2));
$COLOR [1] = $PALETTE [$COLOR [1]+1];
}
ElseIf ($BMP [' bits_per_pixel '] = = 8)
{
$COLOR = Unpack ("n", $VIDE. substr ($IMG, $P, 1));
$COLOR [1] = $PALETTE [$COLOR [1]+1];
}
ElseIf ($BMP [' bits_per_pixel '] = = 4)
{
$COLOR = Unpack ("n", $VIDE. substr ($IMG, Floor ($P), 1));
if ($P *2)%2 = = 0) $COLOR [1] = ($COLOR [1] >> 4); else $COLOR [1] = ($COLOR [1] & 0x0f);
$COLOR [1] = $PALETTE [$COLOR [1]+1];
}
ElseIf ($BMP [' bits_per_pixel '] = = 1)
{
$COLOR = Unpack ("n", $VIDE. substr ($IMG, Floor ($P), 1));
if (($P *8)%8 = = 0) $COLOR [1] = $COLOR [1] >>7;
ElseIf (($P *8)%8 = = 1) $COLOR [1] = ($COLOR [1] & 0x40) >>6;
ElseIf (($P *8)%8 = = 2) $COLOR [1] = ($COLOR [1] & 0x20) >>5;
ElseIf (($P *8)%8 = = 3) $COLOR [1] = ($COLOR [1] & 0x10) >>4;
ElseIf (($P *8)%8 = = 4) $COLOR [1] = ($COLOR [1] & 0x8) >>3;
ElseIf (($P *8)%8 = = 5) $COLOR [1] = ($COLOR [1] & 0x4) >>2;
ElseIf (($P *8)%8 = = 6) $COLOR [1] = ($COLOR [1] & 0x2) >>1;
ElseIf (($P *8)%8 = = 7) $COLOR [1] = ($COLOR [1] & 0x1);
$COLOR [1] = $PALETTE [$COLOR [1]+1];
}
Else
return FALSE;
Imagesetpixel ($res, $X, $Y, $COLOR [1]);
$X + +;
$P + + $BMP [' bytes_per_pixel '];
}
$Y--;
$P + + $BMP [' decal '];
}
Fclose ($f 1);

return $res;
}
BMP save function, PHP itself without
function Imagebmp ($im, $FN = False)
{
if (! $im) return false;

if ($FN = = false) $fn = ' php://output ';
$f = fopen ($fn, "w");
if (! $f) return false;

$biWidth = Imagesx ($im);
$biHeight = Imagesy ($im);
$biBPLine = $biWidth * 3;
$biStride = ($biBPLine + 3) & ~3;
$biSizeImage = $biStride * $biHeight;
$bfOffBits = 54;
$bfSize = $bfOffBits + $biSizeImage;

Fwrite ($f, ' BM ', 2);
Fwrite ($f, Pack (' VvvV ', $bfSize, 0, 0, $bfOffBits));

Fwrite ($f, Pack (' VVVVVVVVVVV ', $biWidth, $biHeight, 1, 0, $biSizeImage, 0, 0, 0, 0));

$numpad = $biStride-$biBPLine;
for ($y = $biHeight-1; $y >= 0;--$y)
{
for ($x = 0; $x < $biWidth; + + $x)
{
$col = Imagecolorat ($im, $x, $y);
Fwrite ($f, Pack (' V ', $col), 3);
}
for ($i = 0; $i < $numpad; + + $i)
Fwrite ($f, Pack (' C ', 0));
}
Fclose ($f);
return true;
}

?>

To sum up, the first class file is not as good as the second one, because the picture will become a little blurry after the first generation, and the next generation class is high quality.

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.