Complete collection of PHP image processing functions

This article mainly introduces the complete collection of PHP image processing functions, which has certain reference value. Now I share it with everyone. Friends in need can refer to it

php image processing code sharing, including scaling, cropping, zooming, flipping, rotating, transparency, sharpening, etc.
1. Create image resources
imagecreatetruecolor(width,height);
imagecreatefromgif(picture name);
imagecreatefrompng(image name);
imagecreatefromjpeg(image name);Draw various images imagegif(image resource, save path);
imagepng( )
imagejpeg();
2. Get the image attributes
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, index 1 contains the pixel value of the image height. Index 2 is a tag 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 are new to PHP 4.3.0 IMAGETYPE constant corresponds. Index 3 is a text string with the content "height="yyy" width="xxx"", which can be directly used for IMG tags.
Destroy image resources
imagedestroy(picture resource);

3. Transparency processing
PNG and jpeg transparent colors are normal, only gif is abnormal
imagecolortransparent(resource image [,int color])//Set a color to a transparent color
imagecolorstotal()
imagecolorforindex() ;

4. Image cropping
imagecopyresized()
imagecopyresampled();

5. Add watermark (text, picture)
String encoding conversion string iconv (string $in_charset, string $out_charset, string $str)

6. Image rotation
imagerotate(); // Image flipping at a specified angle

7. Image flipping
Flip along the X axis along the Y axis

8. Sharpen
imagecolorsforindex()
imagecolorat()
Draw graphics on pictures $img=imagecreatefromgif("./images/map.gif");

2. <?PHP
    /**
    * 图片锐化处理
    */
    $red= imagecolorallocate($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 picture scaling

1. ##

   <?php
    $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);
    //拷贝部分图像并调整
    imagecopyresized($new, $img,0, 0,0, 0,$n_w, $n_h, $width, $height);
    //图像输出新图片、另存为
    imagejpeg($new, "./images/hee2.jpg");
    imagedestroy($new);
    imagedestroy($img);

The picture is scaled proportionally and the transparent color is not processed

1. ##

   <?php
    function thumn($background, $width, $height, $newfile) {
    list($s_w, $s_h)=getimagesize($background);//获取原图片高度、宽度
    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

1. ##

   <?php
    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)){//判断索引色
    $tran=imagecolorsforindex($img, $otsc);//索引颜色值
    $newt=imagecolorallocate($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");

Picture cropping

1. ##

   <?php
   /**
   * 图片裁剪处理
   * 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", 440, 140, 117, 112, "./images/hee5.jpg");
   ?>

Add watermark to picture and text watermark

1. ##

   <?PHP
    /**
    *
    * 图片添加文字水印
    */
    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($back);
    }
    mark_text("./images/hee.jpg", "细说PHP", 150, 250);
    //图片水印
    function mark_pic($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);

   图片旋转
   

   2. <?PHP
       /**
       * 图片旋转
       */
       $back=imagecreatefromjpeg("./images/hee.jpg");
       $new=imagerotate($back, 45, 0);
       imagejpeg($new, "./images/hee9.jpg");
       ?>

   图片水平翻转垂直翻转
   

   点击(此处)折叠或打开

   2. <?php
       /**
       * 图片水平翻转 垂直翻转
       */
       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");
       ?>

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