Php image processing class (generating thumbnails, adding watermarks, and obtaining Image Information)

Php tutorial image processing class (generating thumbnails, adding watermarks, and obtaining Image Information)
This article provides the image processing class. What he can do is to generate a thumbnail of the image, add a watermark to the image, and obtain the image information. This is a simple and practical function */

Class image
{
Public $ info = array ();

Function _ construct ()
{
! Extension_loaded ('gd ') & exit ("www. bKjia. c0m prompt: the server environment does not support gd library ");
Return true;
}

Function image ()
{
$ This->__ construct ();
}
 
Function thumb ($ image, $ thumb_width = 300, $ thumb_height = 225)
{
$ Info = $ this-> info ($ image );
$ Scale = min (1, min ($ thumb_width/$ info ['width'], $ thumb_height/$ info ['height']); // proportional Scaling
$ Thumb_width = intval ($ info ['width'] * $ scale );
$ Thumb_height = intval ($ info ['height'] * $ scale );
$ Createfunc = 'imagecreatefrom '. ($ info ['type'] = 'jpg '? 'Jpeg ': $ info ['type']);
$ Im = $ createfunc ($ image );
$ Thumb_im = $ info ['type']! = 'Gif' & function_exists ('imagecreatetruecolor ')? Imagecreatetruecolor ($ thumb_width, $ thumb_height): imagecreate ($ thumb_width, $ thumb_height );
Imagecopyresampled ($ thumb_im, $ im, 0, 0, 0, $ thumb_width, $ thumb_height, $ info ['width'], $ info ['height']);
If ($ info ['type'] = 'gif' | $ info ['type'] = 'png ')
{
$ Bgcolor = imagecolorallocate ($ thumb_im, 0,255, 0 );
Imagecolortransparent ($ thumb_im, $ bgcolor );
}
$ Imagefunc = 'image'. ($ info ['type'] = 'jpg '? 'Jpeg ': $ info ['type']);
$ Thumbname = 'thumb _ '. $ info ['name'].'. '. $ info ['type'];
$ Imagefunc ($ thumb_im, $ info ['path']. $ thumbname );
Imagedestroy ($ im );
Imagedestroy ($ thumb_im );
Return $ info ['path']. $ thumbname;
}

Function watermark ($ image, $ pos = 9, $ watermarkimg = 'images/watermark.gif ', $ pct = 65, $ text = '', $ w_font = 5, $ w_color = '# ff0000 ')
{
$ Imageinfo = $ this-> info ($ image );
$ Source_w = $ imageinfo ['width'];
$ Source_h = $ imageinfo ['height'];
$ Imagecreatefunc = 'imagecreatefrom '. ($ imageinfo ['type'] = 'jpg '? 'Jpeg ': $ imageinfo ['type']);
$ Im = $ imagecreatefunc ($ image );
If (! Empty ($ watermarkimg) & file_exists ($ watermarkimg) // Add an image watermark
{
$ Iswaterimage = true;
$ Watermarkinfo = $ this-> info ($ watermarkimg );
$ Width = $ watermarkinfo ['width'];
$ Height = $ watermarkinfo ['height'];
$ Watermarkcreatefunc = 'imagecreatefrom '. ($ watermarkinfo ['type'] = 'jpg '? 'Jpeg ': $ watermarkinfo ['type']);
$ Watermark_im = $ watermarkcreatefunc ($ watermarkimg );
}
Else // Add a text watermark
{
$ Iswaterimage = false;
If (! Empty ($ w_color) & strlen ($ w_color) = 7)
{
$ R = hexdec (substr ($ w_color, 1, 2 ));
$ G = hexdec (substr ($ w_color, 3, 2 ));
$ B = hexdec (substr ($ w_color, 5, 2 ));
}
$ Temp = imagettfbbox (ceil ($ w_font * 2.5), 0, 'fonts/alger. ttf', $ text );
$ Width = $ temp [2]-$ temp [6];
$ Height = $ temp [3]-$ temp [7];
Unset ($ temp );
}
Switch ($ pos)
{
Case 0:
$ Wx = mt_rand (0, ($ source_w-$ width ));
$ Wy = mt_rand (0, ($ source_h-$ height ));
Break;
Case 1:
$ Wx = 5;
$ Wy = 5;
Break;
Case 2:
$ Wx = ($ source_w-$ width)/2;
$ Wy = 5;
Break;
Case 3:
$ Wx = $ source_w-$ width-5;
$ Wy = 5;
Break;
Case 4:
$ Wx = 5;
$ Wy = ($ source_h-$ height)/2;
Break;
Case 5:
$ Wx = ($ source_w-$ width)/2;
$ Wy = ($ source_h-$ height)/2;
Break;
Case 6:
$ Wx = $ source_w-$ width-5;
$ Wy = ($ source_h-$ height)/2;
Break;
Case 7:
$ Wx = 5;
$ Wy = $ source_h-$ height-5;
Break;
Case 8:
$ Wx = ($ source_w-$ width)/2;
$ Wy = $ source_h-$ height-5;
Break;
Default:
$ Wx = $ source_w-$ width-5;
$ Wy = $ source_h-$ height-5;
Break;
}
If ($ iswaterimage)
{
If ($ imageinfo ['type'] = 'png '){
Imagecopy ($ im, $ watermark_im, $ wx, $ wy, 0, 0, $ width, $ height );
} Else {
Imagecopymerge ($ im, $ watermark_im, $ wx, $ wy, 0, 0, $ width, $ height, $ pct );
}
}
Else
{
Imagestring ($ im, $ w_font, $ wx, $ wy, $ text, imagecolorallocate ($ im, $ r, $ g, $ B ));
}
$ Imagefunc = 'image'. ($ imageinfo ['type'] = 'jpg '? 'Jpeg ': $ imageinfo ['type']);
$ Imagefunc ($ im, $ image );
Imagedestroy ($ im );
Return true;
}

Function info ($ image)
{
$ Info = array ();
$ Info ['SIZE'] = filesize ($ image );
$ Imageinfo = getimagesize ($ image );
$ Info ['width'] = $ imageinfo [0];
$ Info ['height'] = $ imageinfo [1];
$ Info ['width _ height'] = $ imageinfo [3];
$ Info ['mime '] = $ imageinfo ['mime'];
Unset ($ imageinfo );
$ Imageinfo = pathinfo ($ image );
$ Info ['path'] = $ imageinfo ['dirname']. '/';
$ Info ['type'] = strtolower ($ imageinfo ['extension']); // image type, excluding '.'
$ Info ['name'] = $ imageinfo ['filename'];
Unset ($ imageinfo, $ name );
$ This-> info = $ info;
Return $ info;
}
}