JQuery+PHP realizes online cropping of images

/ * Goofy 2011-11-29 * Image processing: According to the passed coordinate parameters, x, y, w, h, are the selected x coordinate, y coordinate, w width, h height in turn through imagecopy() Method to copy this area to the blank image created in the first step Note that when creating the image, you must use imagecreatetruecolor() for true color, otherwise the image will be distorted using imagecreate() */

Free image cutting without proportion

/**
 * Goofy 2011-11-29
 * Image processing: According to the passed coordinate parameters, x, y, w, h, are the selected x coordinate, y coordinate, w width, h height in turn
 * Through the imagecopy() method Copy this area to the blank image created in the first step
 * Note that when creating the image, you must use imagecreatetruecolor() for true color, otherwise the image will be distorted using imagecreate()
*/

//The proportion passed from the page
$scale=$_GET['scale'];
 //The following attributes are multiplied by the corresponding scale
$x=$_GET['x']*$scale;
$y=$_GET['y']*$scale;
$w=$_GET['w' ]*$scale;
$h=$_GET['h']*$scale;

//Source path
$src=$_GET['src'];

//Do you want to continue? If you do not continue to take screenshots of this picture, the source picture will be deleted
$again="off";
if(!empty($_GET['again'])){
 $again=$_GET['again'];
}

//The first step is to create an image based on the passed width and height parameters, and then fill the intercepted part into this area
header("Content-type: image/jpeg");
 $target = @imagecreatetruecolor($w,$h)
 or die("Cannot Initialize new GD image stream");

//The second step is to get the source image according to the path and create an image object using the source image
$ source = imagecreatefromjpeg($src);

//The third step, according to the passed parameters, select a part of the source image to fill in the image created in the first step
imagecopy( $target, $source, 0, 0, $ x, $y, $w, $h);

//The fourth step, save the image
 //Intercept and organize the new path
$pos_path= strripos($src, "/");
$newPath=substr( $src,0,$pos_path-strlen($src))."_new/";
 //Intercept and organize new names
$pos_name=strripos($src, ".");
$newName=substr($src ,0,$pos_name);
$pos_name_= strripos($newName, "/");
 //The suffix ".jpg" is not added here temporarily to prevent duplicate files. If there are, they need to be renamed and added. It will be inconvenient
$newName=substr($newName,$pos_name_-strlen($newName)+1)."_";
 //Generate pictures without suffix
$file=$newPath.$newName;

/ /Append asc code to rename the file. You can also name it with random numbers, time, etc. I don’t need those naming methods for project requirements
for($i=0;$i<26;$i++){

 //If the directory exists
 if(is_dir($newPath)){
 //If the file exists, continue looping until there are no files with the same name
 if(is_file($file.chr(97+$i).".jpg")){
 continue;
 }else{
 //Create file
 imagejpeg($target,$file.chr(97+$i).".jpg",100);
 //After file creation is completed, determine whether to delete the source file, off is Delete the source file
 if($again=="off"){
 unlink($src);
 unset($_SESSION['url']);
 }
 break;

 }
 }else{
 //Create Directory
 mkdir($newPath);
 //Create file
 imagejpeg($target,$file.chr(97+$i).".jpg",100);
 //After file creation is completed, determine whether to delete the source file, off is to delete the source file
 if($again=="off"){
 unlink($src);
 unset($_SESSION['url']);
 }
 break;
 }
}
//Jump Go to the homepage
Header("Location: index.php");
?>

JQuery, PHP