用PHP将网页上的Canvas图像保存到服务器上的方法

来源：互联网发布：苹果电脑删除mac系统编辑：程序博客网时间：2024/05/24 03:29

前端

<!DOCTYPE html><html><head><meta http-equiv="Content-type" content="text/html; charset = utf-8"><title>HTML5</title><script type="text/javascript" charset = "utf-8"> //这个函数将在页面完全加载后调用 function pageLoaded() { //获取canvas对象的引用,注意tCanvas名字必须和下面body里面的id相同 var canvas = document.getElementById('tCanvas'); //获取该canvas的2D绘图环境 var context = canvas.getContext('2d'); //获取图片对象的引用 var image = document.getElementById('tkjpg'); //在(0,50)处绘制图片 context.drawImage(image,0,50); //缩小图片至原来的一半大小 context.fillStyle='#FF0000';context.fillRect(150,150,100,100);//var image = new Image();//image.src = canvas.toDataURL("image/png");var image = document.getElementById('tkjpg2'); image.src = canvas.toDataURL("image/png");document.getElementById("imgs").value=canvas.toDataURL("image/png");} </script></head><body onload="pageLoaded();"><p></p><img src = "3.jpg" id = "tkjpg" width="300" height="100"><p></p><img   id = "tkjpg2"><canvas width = "800" height = "500" id = "tCanvas" style = "border:black 1px solid;"> </canvas><form id="formid"  name= "myform" method = 'post'  action = '1.php'  >  <input name="img" type="hidden" id="imgs">  <input type="submit" name="sub" value="提交"/></form></body></html>

服务端

<?phpdefine('UPLOAD_DIR', 'images/');$img = $_POST['img'];$img = str_replace('data:image/png;base64,', '', $img);$img = str_replace(' ', '+', $img);$data = base64_decode($img);$file = UPLOAD_DIR . uniqid() . '.png';$success = file_put_contents($file, $data);print $success ? $file : 'Unable to save the file.';?>

从网页上传到服务器端的图片是base64_encode转码过的Data URL格式，数据在服务器端用base64_decode进行解码，保存成文件。

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