PHP upload image generation proportional thumbnail code _php tutorial

Source: Internet
Author: User
Tags imagejpeg
A simple use of PHP upload image files and then generate a picture of the same scale thumbnail effect, there is a need to learn friends can refer to.
The code is as follows Copy Code

function _uploadpic ($upfile, $maxsize, $updir, $newname = ' Date ') {

if ($newname = = ' Date ')

$newname = Date ("Ymdhis"); Use date to make file name

$name = $upfile ["name"];

$type = $upfile ["type"];

$size = $upfile ["Size"];

$tmp _name = $upfile ["Tmp_name"];

Switch ($type) {

Case ' Image/pjpeg ':

Case ' Image/jpeg ':

$extend = ". jpg";

Break

Case ' image/gif ':

$extend = ". gif";

Break

Case ' image/png ':

$extend = ". png";

Break

}

if (Emptyempty ($extend)) {

Echo ("Warning! can only upload image type: GIF JPG PNG ");

Exit ();

}

if ($size > $maxsize) {

$maxpr = $maxsize/1000;

Echo ("Warning! Upload image size cannot exceed ". $maxpr. "k!");

Exit ();

}

if (Move_uploaded_file ($tmp _name, $updir. $newname. $extend)) {

Return $updir. $newname. $extend;

}

}

function show_pic_scal ($width, $height, $picpath) {

$imginfo = getimagesize ($picpath);

$IMGW = $imginfo [0];

$IMGH = $imginfo [1];

$ra = Number_format (($IMGW/$IMGH), 1); Width-to-height ratio

$ra 2 = Number_format (($IMGH/$IMGW), 1); Aspect ratio

if ($imgw > $width or $IMGH > $height) {

if ($imgw > $imgh) {

$newWidth = $width;

$newHeight = Round ($newWidth/$ra);

} elseif ($IMGW < $IMGH) {

$newHeight = $height;

$newWidth = Round ($newHeight/$ra 2);

} else {

$newWidth = $width;

$newHeight = Round ($newWidth/$ra);

}

} else {

$newHeight = $IMGH;

$newWidth = $IMGW;

}

$newsize [0] = $newWidth;

$newsize [1] = $newHeight;

return $newsize;

}

function Getimageinfo ($SRC)

{

Return getimagesize ($SRC);

}

/**

* Create picture, return resource type

* @param string $src picture path

* @return Resource $im return resource type

* **/

function Create ($SRC)

{

$info =getimageinfo ($SRC);

Switch ($info [2])

{

Case 1:

$im =imagecreatefromgif ($SRC);

Break

Case 2:

$im =imagecreatefromjpeg ($SRC);

Break

Case 3:

$im =imagecreatefrompng ($SRC);

Break

}

return $im;

}

/**

* Thumbnail main function

* @param string $src picture path

* @param int $w thumbnail width

* @param int $h thumbnail height

* @return Mixed return thumbnail path

* **/

function Resize ($src, $w, $h)

{

$temp =pathinfo ($SRC);

$name = $temp ["basename"];//file name

$dir = $temp the folder where the ["DirName"];//file is located

$extension = $temp ["extension"];//file name extension

$savepath = "{$dir}/{$name}";//thumbnail save path, new file named *.thumb.jpg

Get basic information about a picture

$info =getimageinfo ($SRC);

$width = $info [0];//get picture width

$height = $info [1];//get picture height

$per 1=round ($width/$height, 2);//calculate original aspect ratio

$per 2=round ($w/$h, 2);//calculate thumbnail aspect ratio

Calculating the zoom ratio

if ($per 1> $per 2| | $per 1== $per 2)

{

The original aspect ratio is greater than or equal to the thumbnail aspect ratio, then the width first

$per = $w/$width;

}

if ($per 1< $per 2)

{

The original aspect ratio is less than the thumbnail aspect ratio, which is high priority

$per = $h/$height;

}

$temp _w=intval ($width * $per);//Calculate the width of the original image after zooming

$temp _h=intval ($height * $per);//Calculate the height of the original image after zooming

$temp _img=imagecreatetruecolor ($temp _w, $temp _h);//Create Canvas

$im =create ($SRC);

Imagecopyresampled ($temp _img, $im, 0,0,0,0, $temp _w, $temp _h, $width, $height);

if ($per 1> $per 2)

{

Imagejpeg ($temp _img, $savepath, 100);

Imagedestroy ($im);

Return addbg ($savepath, $w, $h, "w");

Width first, fill the background with insufficient height after zooming

}

if ($per 1== $per 2)

{

Imagejpeg ($temp _img, $savepath, 100);

Imagedestroy ($im);

return $savepath;

Equal ratio Scaling

}

if ($per 1< $per 2)

{

Imagejpeg ($temp _img, $savepath, 100);

Imagedestroy ($im);

Return addbg ($savepath, $w, $h, "H");

High priority, fill the background with insufficient width after zooming

}

}

/**

* Add background

* @param string $src picture path

* @param int $w background image width

* @param int $h background Image height

* @param String $first determines the final position of the image, W width first h high priority wh: equal ratio

* @return back picture with background

* **/

function addbg ($SRC, $w, $h, $fisrt = "W")

{

$BG =imagecreatetruecolor ($w, $h);

$white = Imagecolorallocate ($BG, 255,255,255);

Imagefill ($BG, 0,0, $white);//Fill background

Get Target picture information

$info =getimageinfo ($SRC);

$width = $info [0];//target image width

$height = $info [1];//target Image Height

$img =create ($SRC);

if ($fisrt = = "WH")

{

Equal ratio Scaling

return $SRC;

}

Else

{

if ($fisrt = = "W")

{

$x = 0;

$y = ($h-$height)/2;//Vertical Center

}

if ($fisrt = = "H")

{

$x = ($w-$width)/2;//Horizontal Center

$y = 0;

}

Imagecopymerge ($BG, $img, $x, $y, 0,0, $width, $height, 100);

Imagejpeg ($BG, $SRC, 100);

Imagedestroy ($BG);

Imagedestroy ($IMG);

return $SRC;

}
}
?>

How to use:

$filename = (_uploadpic ($_files["Upload"), $maxsize, $updir, $newname = ' date ');
$show _pic_scal=show_pic_scal ($filename);
Resize ($filename, $show _pic_scal[0], $show _pic_scal[1]);

http://www.bkjia.com/PHPjc/632958.html www.bkjia.com true http://www.bkjia.com/PHPjc/632958.html techarticle a simple use of PHP upload image files and then generate a picture of the same scale thumbnail effect, there is a need to learn friends can refer to. Code to copy code like this? PHP function_up ...

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