PHP - 获取 base64 img 字符串解码并另存为 jpg(生成空图像)
2022-08-30 21:30:29
嗨,我实际上正在通过ajax将base64图像字符串发送到php脚本,该脚本仅解码字符串并将内容另存为.jpg文件。
但结果是一个空图像。
这怎么可能?
脚本:
$uploadedPhotos = array('photo_1','photo_2','photo_3','photo_4');
foreach ($uploadedPhotos as $file) {
if($this->input->post('photo_1')){
$photoTemp = base64_decode($this->input->post('photo_1'));
/*Set name of the photo for show in the form*/
$this->session->set_userdata('upload_'.$file,'ant');
/*set time of the upload*/
if(!$this->session->userdata('uploading_on_datetime')){
$this->session->set_userdata('uploading_on_datetime',time());
}
$datetime_upload = $this->session->userdata('uploading_on_datetime',true);
/*create temp dir with time and user id*/
$new_dir = 'temp/user_'.$this->session->userdata('user_id',true).'_on_'.$datetime_upload.'/';
@mkdir($new_dir);
/*move uploaded file with new name*/
@file_put_contents( $new_dir.$file.'.jpg',$photoTemp);
}
对于ajax来说,这是可以的,因为echo $photoTemp返回字符串。
我试过了,它返回,因为图像已保存,但图像中没有内容:(空图像var_dump(@file_put_contents( $new_dir.$file.'.jpg',$photoTemp));
bool(true)
对于空图像,我的意思是,文件被创建并命名,并且它具有与我传递给php的内容相同的大小,但是当我尝试打开该图像以预览它时,它说,文件无法打开,因为损坏或错误的文件类型格式
无论如何,这是将照片作为base64并将其发送到php的JS:
<script type="text/javascript">
var _min_width = 470;
var _min_height = 330;
var _which;
var _fyle_type;
var io;
var allowed_types = new Array('image/png','image/jpg','image/jpeg');
if (typeof(FileReader) === 'function'){
$('input[type="file"]').on('change', function(e) {
var _file_name = $(this).val();
$('.'+_which+'_holder').text(_file_name);
var file = e.target.files[0];
if (!in_array(file.type,allowed_types) || file.length === 0){
notify("You must select a valid image file!",false,false);
return;
}
if(file.size > 3145728 /*3MB*/){
notify("<?php echo lang('each-photo-1MB'); ?>",false,false);
return;
}
notify_destroy();
var reader = new FileReader();
reader.onload = fileOnload;
reader.readAsDataURL(file);
});
function fileOnload(e) {
var img = document.createElement('img');
img.src = e.target.result;
img.addEventListener('load', function() {
if(img.width < _min_width || img.height < _min_height ){
notify("<?php echo lang('each-photo-1MB'); ?>",false,false);
return;
}
$.ajax({
type:'post',
dataType:'script',
data:{photo_1:e.target.result},
url:_config_base_url+'/upload/upload_photos',
progress:function(e){
console.log(e);
},
success:function(d){
$('body').append('<img src="'+d+'"/>');
}
});
});
}
}
</script>