Php generates thumbnails and watermarks _ PHP Tutorial

Php generates thumbnails and adds watermarks. This simple GD Library operation [php]? Php *** PHP lecture Forum: www. zixue. it weibo: weibo. comYshibaYY Channel: 88354001 * a simple GD Library operation for image operations

[Php]

/****

Yan 18 public welfare PHP Lecture Hall

Discussion: http://www.zixue.it

Micro Bo: http://weibo.com/Yshiba

YY Channel: 88354001

****/

/***

Image operations

First, you must obtain the image size and type information.

Watermark: copies the specified watermark to the target and adds the transparency effect.

Thumbnail: copies a large image to a small image.

***/

Class ImageTool {

// ImageInfo analyzes image information

// Return array ()

Public static function imageInfo ($ image ){

// Determine whether an image exists

If (! File_exists ($ image )){

Return false;

}

$ Info = getimagesize ($ image );

If ($ info = false ){

Return false;

}

// Info is analyzed as an array.

$ Img ['width'] = $ info [0];

$ Img ['height'] = $ info [1];

$ Img ['ext '] = substr ($ info ['Mime'], strpos ($ info ['Mime '],'/') + 1 );

Return $ img;

}

/*

Watermarking

Parm String $ dst and other operation images

Parm String $ water watermark thumbnail

Parm String $ save. If this parameter is not specified, the original graph is replaced by default.

*/

Public static function water ($ dst, $ water, $ save = NULL, $ pos = 2, $ alpha = 50 ){

// Ensure that two images exist first

If (! File_exists ($ dst) |! File_exists ($ water )){

Return false;

}

// First, ensure that the watermark cannot be larger than the image to be operated

$ Dinfo = self: imageInfo ($ dst );

$ Winfo = self: imageInfo ($ water );

If ($ winfo ['height']> $ dinfo ['height'] | $ winfo ['width']> $ dinfo ['width']) {

Return false;

}

// Read the two images on the canvas! However, the image may be png or jpeg. what function is used to read the image?

$ Dfunc = 'imagecreatefrom '. $ dinfo ['ext'];

$ Wfunc = 'imagecreatefrom '. $ winfo ['ext'];

If (! Function_exists ($ dfunc) |! Function_exists ($ wfunc )){

Return false;

} Www.2cto.com

// Dynamically load the function to create the canvas

$ Dim = $ dfunc ($ dst );

// Create the canvas to be operated

$ Wim = $ wfunc ($ water );

// Create a watermark canvas

// Calculate the pasted coordinates based on the Watermark Position

Switch ($ pos ){

Case 0:

// Upper left corner

$ Posx = 0;

$ Posy = 0;

Break;

Case 1:

// Upper right corner

$ Posx = $ dinfo ['width']-$ winfo ['width'];

$ Posy = 0;

Break;

Case 3:

// Lower left corner

$ Posx = 0;

$ Posy = $ dinfo ['height']-$ winfo ['height'];

Break;

Default:

$ Posx = $ dinfo ['width']-$ winfo ['width'];

$ Posy = $ dinfo ['height']-$ winfo ['height'];

}

// Add a watermark

Imagecopymerge ($ dim, $ wim, $ posx, $ posy, 0, 0, $ winfo ['width'], $ winfo ['height'], $ alpha );

// Save

If (! $ Save ){

$ Save = $ dst;

Unlink ($ dst );

// Delete the source image

}

$ Createfunc = 'image'. $ dinfo ['text'];

$ Createfunc ($ dim, $ save );

Imagedestroy ($ dim );

Imagedestroy ($ wim );

Return true;

}

/**

Create a thumbnail using thumb

Proportional scaling, left white on both sides

**/

Public static function thumb ($ dst, $ save = NULL, $ width = 200, $ height = 200 ){

// First, determine whether the image to be processed does not exist.

$ Dinfo = self: imageInfo ($ dst );

If ($ dinfo = false ){

Return false;

}

// Calculate the scaling ratio

$ Calc = min ($ width/$ dinfo ['width'], $ height/$ dinfo ['height']);

// Create the canvas of the original graph

$ Dfunc = 'imagecreatefrom '. $ dinfo ['ext'];

$ Dim = $ dfunc ($ dst );

// Create a thumbnail

$ Tim = imagecreatetruecolor ($ width, $ height );

// Create a white fill thumbnail

$ White = imagecolorallocate ($ tim, 255,255,255 );

// Fill the thumbnail

Imagefill ($ tim, 0, 0, $ white );

// Copy and scale down

$ Dwidth = (int) $ dinfo ['width'] * $ calc;

$ Dheight = (int) $ dinfo ['height'] * $ calc;

$ Paddingx = (int) ($ width-$ dwidth)/2;

$ Paddingy = (int) ($ height-$ dheight)/2;

Imagecopyresampled ($ tim, $ dim, $ paddingx, $ paddingy, 0, 0, $ dwidth, $ dheight, $ dinfo ['width'], $ dinfo ['height']);

// Save the image

If (! $ Save ){

$ Save = $ dst;

Unlink ($ dst );

}

$ Createfunc = 'image'. $ dinfo ['text'];

$ Createfunc ($ tim, $ save );

Imagedestroy ($ dim );

Imagedestroy ($ tim );

Return true;

}

}

// Print_r (ImageTool: imageInfo ('./home.jpg '));

/* Www.2cto.com

Echo ImageTool: water ('./home.jpg', './smallfeng.png', 'home1.jpg', 0 )? 'OK': 'fail ';

Echo ImageTool: water ('./home.jpg', './smallfeng.png', 'home2.jpg', 1 )? 'OK': 'fail ';

Echo ImageTool: water ('./home.jpg', './smallfeng.png', 'home3.jpg', 2 )? 'OK': 'fail ';

Echo ImageTool: water ('./home.jpg', './smallfeng.png', 'home4.jpg', 3 )? 'OK': 'fail ';

*/

Why [php]? Php/*** Yan 18 public welfare PHP lecture altar: http://www.zixue.it micro Bo: http://weibo.com/Yshiba YY Channel: 88354001 *** // *** want to operate pictures...