(Advanced) PHP image processing functions and code examples

First, create a picture resource

Imagecreatetruecolor (width,height); imagecreatefromgif (picture name); imagecreatefrompng (picture name); Imagecreatefromjpeg (image name) ; draw a variety of image imagegif (picture resource, save path); Imagepng () imagejpeg ();

Second, get picture properties
Imagesx (res//width
Imagesy (res//height
getimagesize (file path)
Returns an array with four cells. Index 0 contains the pixel value of the image width, and index 1 contains the pixel value of the image height. Index 2 is a marker 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 constants of PHP 4.3.0. Index 3 is a text string with the content "height=" yyy "width=" xxx ", which can be used directly with the IMG tag.
Destroying image Resources
Imagedestroy (picture resources);

Third, transparent processing
PNG, JPEG transparent color is normal, only gif is not normal

Imagecolortransparent (resource image [, int color])//Set a color to Transparent color imagecolorstotal () imagecolorforindex ();

Four, the picture cutting

Imagecopyresized () imagecopyresampled ();

Five, watermark (text, pictures)
String encoding converts string Iconv (String $in _charset, String $out _charset, String $str)

Six, the picture rotation
Imagerotate ();//Make an angle picture flip

Seven, the picture of the flip
Flips along the x-axis along the y-axis

Eight, sharpening

Imagecolorsforindex () Imagecolorat ()

Draw a graphic on the picture $img =imagecreatefromgif ("./images/map.gif");

. The code is as follows:

<? PHP/** * Image Sharpening processing */$red = imagecolorallocate ($img, 255, 0, 0); Imageline ($img, 0, 0, +, +, $red); Imageellipse ($img, $, $red); Imagegif ($img, "./images/map2.gif"); Imagedestroy ($IMG);

Picture Normal Zoom
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 part of the image and adjust imagecopyresized ($new, $img, 0, 0,0, 0, $n _w, $n _h, $width, $height); Image output new picture, Save as imagejpeg ($new, "./images/hee2.jpg"); Imagedestroy ($new); Imagedestroy ($IMG);

Picture, etc. scale, not handle transparent color
The code is as follows:

function Thumn ($background, $width, $height, $newfile) {list ($s _w, $s _h) =getimagesize ($background);//Get original picture height, width if ($ Width && ($s _w < $s _h)) {$width = ($height/$s _h) * $s _w,} else {$height = ($width/$s _w) * $s _h;} $new =i Magecreatetruecolor ($width, $height); $img =imagecreatefromjpeg ($background); Imagecopyresampled ($new, $img, 0, 0, 0, 0, $width, $height, $s _w, $s _h); Imagejpeg ($new, $newfile); Imagedestroy ($new); Imagedestroy ($IMG); } thumn ("Images/hee.jpg", "$," "./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 ($width && Amp ($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)) {//Determine 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 ($IMG); } thumn ("Images/map.gif", "$," "./images/map3.gif");

Picture clipping

. The code is as follows:

<?php/*** Picture Clipping processing * edit by Www.jbxue.com*/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", the 117, the "./images/hee5.jpg"); >

Image watermark and Watermark text

. The code is as follows:

<? PHP/** *  * Image Add text watermark */function Mark_text ($background, $text, $x, $y) {$back =imagecreatefromjpeg ($background); $colo R=imagecolorallocate ($back, 0, 255, 0); Imagettftext ($back, 0, $x, $y, $color, "Simkai.ttf", $text); Imagejpeg ($back, "./images/hee7.jpg"); Imagedestroy ($back); } mark_text ("./images/hee.jpg", "elaborating PHP", 150, 250); Image watermark Function Mark_pic ($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);? >

Picture rotation

. The code is as follows:

<? PHP/** * Image rotation */$back =imagecreatefromjpeg ("./images/hee.jpg"); $new =imagerotate ($back, 45, 0); Imagejpeg ($new, "./images/hee9.jpg");?>

Picture Horizontal Flip Vertical Flip

. The code is as follows:

<?php/** * Picture 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 ($new); The function turn_x ($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");?>

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