Simple example of php image processing function

//header('Content-Type: text/html;charset=utf-8');
//Image processing
//1 Set MIME type output type text/html defaults to the web page type and does not need to be written

header('Content-Type:image/png;');

$width = 400;
$height = 400;
//2 Create an image area width and height
 $img = imagecreatetruecolor($width,$height);

//Assign color handle to the image, red and green
$blue = imagecolorallocate($img,0,102,255);

//Fill color resource handle x-axis y-axis color
 imagefill($img,0,0,$blue);

//Continue to create colors
$while = imagecolorallocate($img,255,255,255);

//Draw a line handle x start y start x end y end color
 imageline($img,60,90,90,60,$while);

//Print image information
getimagesize($img);
//Draw text handle font size x-axis Y-axis content color
imagestring($img,5,0,0,'wwwww',$while);

//Load image list() This function is good
imagecreatefrompng('22.png');

/ /The original image is copied from the new sample to the new image
//New image handle original image handle new image xy original image xy new image length plateau original image length height
imagecopyresampled($img,$yuan,40,40,0,0,$ _width,$_height,$width,$height);

//Output image
imagepng($img);
//Destroy handle
imagedestroy($img);
?>