Php image processing functions (recommended)-PHP source code

Php image processing code sharing, including scaling, cropping, scaling, turning, rotating, transparent, and sharpening. For more information, see php image processing code sharing, including scaling, cropping, scaling, turning, rotating, transparency, and sharpening. For more information, see

I. create image resources
Imagecreatetruecolor (width, height );
Imagecreatefromgif (image name );
Imagecreatefrompng (image name );
Imagecreatefromjpeg (image name); draw various image imagegif (image resource, save path );
Imagepng ()
Imagejpeg ();

II. retrieving image attributes
Imagesx (res // width
Imagesy (res // height
Getimagesize (file path)
Returns an array with four units. Index 0 contains the pixel value of the image width, and index 1 contains the pixel value of the image height. Index 2 is the mark of the image type: 1 = GIF, 2 = JPG, 3 = PNG, 4 = SWF, 5 = PSD, 6 = BMP, 7 = TIFF (intel byte order), 8 = TIFF (motorola byte order), 9 = JPC, 10 = JP2, 11 = JPX, 12 = JB2, 13 = SWC, 14 = IFF, 15 = WBMP, 16 = XBM. These tags correspond to the newly added IMAGETYPE constant in PHP 4.3.0. Index 3 is a text string with the content "height =" yyy "width =" xxx "and can be directly used for IMG marking.
Destroy Image resources
Imagedestroy (image resources );

3. transparent processing
PNG and jpeg transparent colors are normal, only gif is abnormal
Imagecolortransparent (resource image [, int color]) // sets a color to transparent.
Imagecolorstotal ()
Imagecolorforindex ();

IV. image cropping
Imagecopyresized ()
Imagecopyresampled ();

5. add watermarks (text and images)
String Encoding and conversion string iconv (string $ in_charset, string $ out_charset, string $ str)

VI. rotating images
Imagerotate (); // specifies the Image flip angle

VII. Image flip
Flip along x axis along y axis

8. sharpen
Imagecolorsforindex ()
Imagecolorat ()
Image $ img = imagecreatefromgif ("./images/map.gif ");

/**
* Image sharpening
*/
$ Red = imagecolorallocate ($ img, 255, 0, 0 );

Imageline ($ img, 0, 0,100,100, $ red );
Imageellipse ($ img, 200,100,100,100, $ red );
Imagegif ($ img, "./images/map2.gif ");
Imagedestroy ($ img );
Normal image scaling
The code is as follows:

$ Filename = "./images/hee.jpg ";
$ Per = 0.3;
List ($ width, $ height) = getimagesize ($ filename );
$ N_w = $ width * $ per;
$ N_h = $ width * $ per;
$ New = imagecreatetruecolor ($ n_w, $ n_h );
$ Img = imagecreatefromjpeg ($ filename );
// Copy and adjust part of the image
Imagecopyresized ($ new, $ img, 0, 0, 0, $ n_w, $ n_h, $ width, $ height );
// Output new image and save it
Imagejpeg ($ new, "./images/hee2.jpg ");
Imagedestroy ($ new );
Imagedestroy ($ img );

Proportional scaling of images, not processing transparent colors
The code is as follows:
Function thumn ($ background, $ width, $ height, $ newfile ){
List ($ s_w, $ s_h) = getimagesize ($ background); // Obtain the height and width of the original image.
If ($ width & ($ s_w <$ s_h )){
$ Width = ($ height/$ s_h) * $ s_w;
} Else {
$ Height = ($ width/$ s_w) * $ s_h;
}
$ New = imagecreatetruecolor ($ width, $ height );
$ Img = imagecreatefromjpeg ($ background );
Imagecopyresampled ($ new, $ img, 0, 0, 0, 0, $ width, $ height, $ s_w, $ s_h );
Imagejpeg ($ new, $ newfile );
Imagedestroy ($ new );
Imagedestroy ($ img );
}
Thumn ("images/hee.jpg", 200,200, "./images/hee3.jpg ");

Gif transparent color processing
The code is as follows:
Function thumn ($ background, $ width, $ height, $ newfile ){
List ($ s_w, $ s_h) = getimagesize ($ background );
If ($ width & ($ s_w <$ s_h )){
$ Width = ($ height/$ s_h) * $ s_w;
} Else {
$ Height = ($ width/$ s_w) * $ s_h;
}
$ New = imagecreatetruecolor ($ width, $ height );
$ Img = imagecreatefromgif ($ background );
$ Otsc = imagecolortransparent ($ img );
If ($ otsc> = 0 & $ otst <imagecolorstotal ($ img) {// you can determine the index color.
$ Tran = imagecolorsforindex ($ img, $ otsc); // Index color value
$ Newt = imagecolorallocate ($ new, $ tran ["red"], $ tran ["green"], $ tran ["blue"]);
Imagefill ($ new, 0, 0, $ newt );
Imagecolortransparent ($ new, $ newt );
}
Imagecopyresized ($ new, $ img, 0, 0, 0, 0, $ width, $ height, $ s_w, $ s_h );
Imagegif ($ new, $ newfile );
Imagedestroy ($ new );
Imagedestroy ($ img );
}
Thumn ("images/map.gif", 200,200, "./images/map3.gif ");

Crop Images

The code is as follows:

/**
* Image cropping
* Edit by www.jb51.net
*/
Function cut ($ background, $ cut_x, $ cut_y, $ cut_width, $ cut_height, $ location ){
$ Back = imagecreatefromjpeg ($ background );
$ New = imagecreatetruecolor ($ cut_width, $ cut_height );
Imagecopyresampled ($ new, $ back, 0, 0, $ cut_x, $ cut_y, $ cut_width, $ cut_height, $ cut_width, $ cut_height );
Imagejpeg ($ new, $ location );
Imagedestroy ($ new );
Imagedestroy ($ back );
}
Cut ("./images/hee.jpg", 440,140,117,112, "./images/hee5.jpg ");
?>

Add text watermarks to images

/**
*
* Adding a text watermark to an image
*/
Function mark_text ($ background, $ text, $ x, $ y ){
$ Back = imagecreatefromjpeg ($ background );
$ Color = imagecolorallocate ($ back, 0,255, 0 );
Imagettftext ($ back, 20, 0, $ x, $ y, $ color, "simkai. ttf", $ text );
Imagejpeg ($ back, "./images/hee7.jpg ");
Imagedestroy ($ back );
}
Mark_text ("./images/hee.jpg", "PHP", 150,250 );
// Image watermark
Function mark_pic ($ background, $ waterpic, $ x, $ y ){
$ Back = imagecreatefromjpeg ($ background );
$ Water = imagecreatefromgif ($ waterpic );
$ W_w = imagesx ($ water );
$ W_h = imagesy ($ water );
Imagecopy ($ back, $ water, $ x, $ y, 0, 0, $ w_w, $ w_h );
Imagejpeg ($ back, "./images/hee8.jpg ");
Imagedestroy ($ back );
Imagedestroy ($ water );
}
Mark_pic ("./images/hee.jpg", "./images/gaolf.gif", 50,200 );

Image Rotation

/**
* Image rotation
*/
$ Back = imagecreatefromjpeg ("./images/hee.jpg ");

$ New = imagerotate ($ back, 45, 0 );
Imagejpeg ($ new, "./images/hee9.jpg ");
?>

Horizontal flip vertical flip

/**
* Horizontal flip vertical flip
*/
Function turn_y ($ background, $ newfile ){
$ Back = imagecreatefromjpeg ($ background );
$ Width = imagesx ($ back );
$ Height = imagesy ($ back );
$ New = imagecreatetruecolor ($ width, $ height );
For ($ x = 0; $ x <$ width; $ x ++ ){
Imagecopy ($ new, $ back, $ width-$ X-1, 0, $ x, 0, 1, $ height );
}
Imagejpeg ($ new, $ newfile );
Imagedestroy ($ back );
Imagedestroy ($ new );
}
Function turn_x ($ background, $ newfile ){
$ Back = imagecreatefromjpeg ($ background );
$ Width = imagesx ($ back );
$ Height = imagesy ($ back );
$ New = imagecreatetruecolor ($ width, $ height );
For ($ y = 0; $ y <$ height; $ y ++ ){
Imagecopy ($ new, $ back, 0, $ height-$ Y-1, 0, $ y, $ width, 1 );
}
Imagejpeg ($ new, $ newfile );
Imagedestroy ($ back );
Imagedestroy ($ new );
}
Turn_y ("./images/hee.jpg", "./images/hee11.jpg ");
Turn_x ("./images/hee.jpg", "./images/hee12.jpg ");
?>