PHP AjaxForm submits image upload and displays image

This article mainly introduces PHP AjaxForm to submit image upload and display image source code in detail. It has certain reference value. Interested friends can refer to

PHP dofile.php file upload source code.

$file_allow_size){  
  $data['status'] = 1;
  $data['msg'] = "文件大小超过限制,只能上传".sizeFormat($file_allow_size)."的文件!"; 
  } 
  if($data['status']==1){
  $data['status'] = 1;
  $data['msg'] = $data['msg'];
  exit(json_encode($data)); 
  }
  if($data['status']==0){
  if(file_exists($file_upload)){   
   $file_new_name = date("YmdHis").'_'.rand(10000,99999).'.'.$file_ext;
   $file_save_path = $file_upload.$file_new_name; 
   $data['status'] = 0;  
   $data['url'] = $file_save_path;
   move_uploaded_file($file_tmp_name,$file_save_path);
   exit(json_encode($data));    
  }else{
   exit(json_encode($data));
  }  

  }   
 }
}

function sizeFormat($size)
{
 $sizeStr='';
 if($size<1024)
 {
  return $size."bytes";
 }
 else if($size<(1024*1024))
 {
  $size=round($size/1024,1);
  return $size."KB";
 }
 else if($size<(1024*1024*1024))
 {
  $size=round($size/(1024*1024),1);
  return $size."MB";
 }
 else
 {
  $size=round($size/(1024*1024*1024),1);
  return $size."GB";
 } 
}



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文件:

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