PHP Picture clipping function _php Tutorial

This article mainly introduces the PHP picture clipping function, while maintaining the image is not deformed, the need for friends can refer to the next

In order to complete the image after uploading the automatic cropping, and then in the foreground to display the cropped pictures.

Requirements as above, the source code is as follows:

The code is as follows:

*exif_imagetype--Judging the type of an image

* Description: Function function is to cut an image into an image of any size, the image is not deformed

* Parameter Description: Enter the file name that needs to process the picture, generate a new picture of the saved file name, create a new image width, create a new picture of the high

*/

Get images of any size, stretch without distortion, leave no space

function My_image_resize ($src _file, $dst _file, $new _width, $new _height) {

$new _width= intval ($new _width);

$new _height=intval ($new _width);

if ($new _width <1 | | $new _height <1) {

echo "Params width or height error!";

Exit ();

}

if (!file_exists ($src _file)) {

Echo $src _file. "is NOT exists!";

Exit ();

}

Image type

$type =exif_imagetype ($src _file);

$support _type=array (Imagetype_jpeg, Imagetype_png, imagetype_gif);

if (!in_array ($type, $support _type,true)) {

echo "This type of image does not support! Only support JPG, GIF or PNG ";

Exit ();

}

Load image

Switch ($type) {

Case IMAGETYPE_JPEG:

$src _img=imagecreatefromjpeg ($src _file);

Break

Case Imagetype_png:

$src _img=imagecreatefrompng ($src _file);

Break

Case Imagetype_gif:

$src _img=imagecreatefromgif ($src _file);

Break

Default

echo "Load image error!";

Exit ();

}

$w =imagesx ($src _img);

$h =imagesy ($src _img);

$ratio _w=1.0 * $new _width/$w;

$ratio _h=1.0 * $new _height/$h;

$ratio = 1.0;

The resulting image of the aspect ratio of the original is small, or all large, the principle is to take a large proportion of magnification, take a large proportion of the reduction (smaller proportion)

if (($ratio _w < 1 && $ratio _h < 1) | | ($ratio _w > 1 && $ratio _h > 1)) {

if ($ratio _w < $ratio _h) {

$ratio = $ratio _h; Case one, the width of the ratio is smaller than the height direction, according to the height of the proportional standard to cut or enlarge

}else {

$ratio = $ratio _w;

}

Defines an intermediate temporary image that meets the target's aspect ratio exactly.

$inter _w= (int) ($new _width/$ratio);

$inter _h= (int) ($new _height/$ratio);

$inter _img=imagecreatetruecolor ($inter _w, $inter _h);

Var_dump ($inter _img);

Imagecopy ($inter _img, $src _img, 0,0,0,0, $inter _w, $inter _h);

Generates a temporary image that is the size of the maximum edge length, which is the $ratio scale of the target image

To define a new image

$new _img=imagecreatetruecolor ($new _width, $new _height);

Var_dump ($new _img); exit ();

Imagecopyresampled ($new _img, $inter _img,0,0,0,0, $new _width, $new _height, $inter _w, $inter _h);

Switch ($type) {

Case IMAGETYPE_JPEG:

Imagejpeg ($new _img, $dst _file,100); Storing images

Break

Case Imagetype_png:

Imagepng ($new _img, $dst _file,100);

Break

Case Imagetype_gif:

Imagegif ($new _img, $dst _file,100);

Break

Default

Break

}

}//End If 1

2 One edge of the target image is larger than the original, one edge is smaller than the original, the flat image is enlarged, then cropped

=if (($ratio _w < 1 && $ratio _h > 1) | | ($ratio _w >1 && $ratio _h <1))

else{

$ratio = $ratio _h> $ratio _w? $ratio _h: $ratio _w; Take a large proportion of that value

Defines an intermediate large image that is equal in height or width of the target image, and then zooms in on the original image

$inter _w= (int) ($W * $ratio);

$inter _h= (int) ($H * $ratio);

$inter _img=imagecreatetruecolor ($inter _w, $inter _h);

Crop after scaling the original

Imagecopyresampled ($inter _img, $src _img,0,0,0,0, $inter _w, $inter _h, $w, $h);

To define a new image

$new _img=imagecreatetruecolor ($new _width, $new _height);

Imagecopy ($new _img, $inter _img, 0,0,0,0, $new _width, $new _height);

Switch ($type) {

Case IMAGETYPE_JPEG:

Imagejpeg ($new _img, $dst _file,100); Storing images

Break

Case Imagetype_png:

Imagepng ($new _img, $dst _file,100);

Break

Case Imagetype_gif:

Imagegif ($new _img, $dst _file,100);

Break

Default

Break

}

}//IF3

}//End Function

My_image_resize (' test.gif ', ' 11111.gif ', ' 100px ', ' 100px ');

?>

http://www.bkjia.com/PHPjc/764904.html www.bkjia.com true http://www.bkjia.com/PHPjc/764904.html techarticle This article mainly introduces the PHP picture clipping function, while maintaining the image is not deformed, the need for friends can refer to the following in order to complete the image upload automatically after the crop, and then show in the foreground ...

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