php如何获取ajax提交过来的经过base64处理后的图片
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2022-04-28 18:02:22
...
function onSelectPhoto(files) {
file_obj = files[0];
if (use_general_upload) {
return;
}
var filesize = file_obj.size 5242880;
var allow_type = '|.jpg|jpeg|.png|.gif|';
var ext_name = '|' + file_obj.name.toLowerCase().substr(file_obj.name.length - 4) + '|';
var filetype = (allow_type.indexOf(ext_name) == -1 && file_obj.name.indexOf(".") > 0);
var reader = new FileReader();
reader.onload = function (e) {
if (e.target.result.substr(0, 11) == 'data:base64') {
$("#preview_img").attr('src',
"data:application/octet-stream;"
+ e.target.result.substr(e.target.result.indexOf("base64,")));
} else {
$("#preview_img").attr('src', e.target.result);
}
}
if (filesize) {
file_obj = false;
showTextTime("您选择的文件大于5MB，请选择小于5MB的照片", 3000);
return false;
}
if (filetype) {
file_obj = false;
showTextTime("您选择的文件格式有误，应为JPG、PNG或GIF类型的文件", 3000);
return false;
}
file_name = file_obj.name;
reader.readAsDataURL(file_obj); //
// alert(reader);
}图片上传处理代码
function upload_photo() {
if (file_obj == false) {
showTextTime("请先从手机中选取要上传的照片", 2000);
return false;
}
if (uploading) {
showTextTime("照片正在上传中，请稍候...", 2000);
return false;
}
uploading = true;
showLoading(loading_src, "照片上传中...", 0);
if (use_general_upload) {
document.forms[0].submit();
} else {
var ui = $("#upload_ifr");
var ui = ui[0];
ui.contentWindow.upload_photo();
}
return false;
}
function upload_photo() {
var xhr = new XMLHttpRequest();
if (xhr.upload) {
xhr.onreadystatechange = function(e) {
window.top.callbackHandler(e, xhr);
};
xhr.upload.onprogress=function(e){
if(e.lengthComputable){
var percent =(e.loaded / e.total *100|0)+"%";
}
}
var formData = new FormData();
formData.append('files', window.top.file_obj);
// alert(formData);
xhr.open("POST", 'upload_file.php', true);
xhr.send(formData);
}
}
这里我应该怎么在upload_file.php获取到传递过来的formData
回复内容：
function onSelectPhoto(files) {
file_obj = files[0];
if (use_general_upload) {
return;
}
var filesize = file_obj.size 5242880;
var allow_type = '|.jpg|jpeg|.png|.gif|';
var ext_name = '|' + file_obj.name.toLowerCase().substr(file_obj.name.length - 4) + '|';
var filetype = (allow_type.indexOf(ext_name) == -1 && file_obj.name.indexOf(".") > 0);
var reader = new FileReader();
reader.onload = function (e) {
if (e.target.result.substr(0, 11) == 'data:base64') {
$("#preview_img").attr('src',
"data:application/octet-stream;"
+ e.target.result.substr(e.target.result.indexOf("base64,")));
} else {
$("#preview_img").attr('src', e.target.result);
}
}
if (filesize) {
file_obj = false;
showTextTime("您选择的文件大于5MB，请选择小于5MB的照片", 3000);
return false;
}
if (filetype) {
file_obj = false;
showTextTime("您选择的文件格式有误，应为JPG、PNG或GIF类型的文件", 3000);
return false;
}
file_name = file_obj.name;
reader.readAsDataURL(file_obj); //
// alert(reader);
}图片上传处理代码
function upload_photo() {
if (file_obj == false) {
showTextTime("请先从手机中选取要上传的照片", 2000);
return false;
}
if (uploading) {
showTextTime("照片正在上传中，请稍候...", 2000);
return false;
}
uploading = true;
showLoading(loading_src, "照片上传中...", 0);
if (use_general_upload) {
document.forms[0].submit();
} else {
var ui = $("#upload_ifr");
var ui = ui[0];
ui.contentWindow.upload_photo();
}
return false;
}
function upload_photo() {
var xhr = new XMLHttpRequest();
if (xhr.upload) {
xhr.onreadystatechange = function(e) {
window.top.callbackHandler(e, xhr);
};
xhr.upload.onprogress=function(e){
if(e.lengthComputable){
var percent =(e.loaded / e.total *100|0)+"%";
}
}
var formData = new FormData();
formData.append('files', window.top.file_obj);
// alert(formData);
xhr.open("POST", 'upload_file.php', true);
xhr.send(formData);
}
}
这里我应该怎么在upload_file.php获取到传递过来的formData
`
$smeta = $_POST['smeta'];
if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $smeta, $result)) {//base64上传
$data = base64_decode(str_replace($result[1], '', $smeta));
$dataname = './Uploads/' . uniqid() . '.' . $result[2];
if (file_put_contents($dataname, $data)) {
$this->ajaxoutput($dataname); //返回数据结构自行封装
}else{
$this->ajaxerror('上传出错');
}}`
base64_decode()
为什么不直接上传图片,这样做费力不讨好. 如果用base64提交,可以把他当字符串post, 后台从$_POST里取出就好了.
先正则提取图片后缀和数据流，再对数据流进行base64_decode
private function decodeFile($base64_url)
{
preg_match('/^data:image\/(\w+);base64/', $base64_url, $out);
$type = $out[1];
$type_param = 'data:image/' . $type . ';base64,';
$fileStream = str_replace($type_param, '', $base64_url);
$fileStream = base64_decode($fileStream);
return array(
'type' => $type,
'fileStream' => $fileStream
);
}
public function base64img()
{
if (preg_match('/^(data:\s*image\/(\w+);base64,)/', $_POST['pic'], $result))
{
$new_file = "Uploads/Picture/" . uniqid() . '.png';
file_put_contents($new_file, base64_decode(str_replace($result[1], '', $_POST['pic'])));
return $new_file;
}
}