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本文分享一个不错的php文件上传，可以实现单个文件的上传、多个文件的上传功能。有需要的朋友参考下吧。

1，php文件上传类

language = "en"; // choice of en, nl, es
  $this->rename_file = false;
  $this->ext_string = "";
 }
 function show_error_string() {
  $msg_string = "";
  foreach ($this->message as $value) {
   $msg_string .= $value."
\n";
  }
  return $msg_string;
 }
 function set_file_name($new_name = "") { // this "conversion" is used for unique/new filenames 
  if ($this->rename_file) {
   if ($this->the_file == "") return;
   $name = ($new_name == "") ? strtotime("now") : $new_name;
   $name = $name.$this->get_extension($this->the_file);
  } else {
   $name = $this->the_file;
  }
  return $name;
 }
 function upload($to_name = "") {
  $new_name = $this->set_file_name($to_name);
  if ($this->check_file_name($new_name)) {
   if ($this->validateExtension()) {
    if (is_uploaded_file($this->the_temp_file)) {
     $this->file_copy = $new_name;
     if ($this->move_upload($this->the_temp_file, $this->file_copy)) {
      $this->message[] = $this->error_text($this->http_error);
      if ($this->rename_file) $this->message[] = $this->error_text(16);
      return true;
     }
    } else {
     $this->message[] = $this->error_text($this->http_error);
     return false;
    }
   } else {
    $this->show_extensions();
    $this->message[] = $this->error_text(11);
    return false;
   }
  } else {
   return false;
  }
 }
 function check_file_name($the_name) {
  if ($the_name != "") {
   if (strlen($the_name) > $this->max_length_filename) {
    $this->message[] = $this->error_text(13);
    return false;
   } else {
    if ($this->do_filename_check == "y") {
     if (preg_match("/^[a-z0-9_]*\.(.){1,5}$/i", $the_name)) {
      return true;
     } else {
      $this->message[] = $this->error_text(12);
      return false;
     }
    } else {
     return true;
    }
   }
  } else {
   $this->message[] = $this->error_text(10);
   return false;
  }
 }
 function get_extension($from_file) {
  $ext = strtolower(strrchr($from_file,"."));
  return $ext;
 }
 function validateExtension() {
  $extension = $this->get_extension($this->the_file);
  $ext_array = $this->extensions;
  if (in_array($extension, $ext_array)) { 
   // check mime type hier too against allowed/restricted mime types (boolean check mimetype)
   return true;
  } else {
   return false;
  }
 }
 // this method is only used for detailed error reporting
 function show_extensions() {
  $this->ext_string = implode(" ", $this->extensions);
 }
 function move_upload($tmp_file, $new_file) {
  umask(0);
  if ($this->existing_file($new_file)) {
   $newfile = $this->upload_dir.$new_file;
   if ($this->check_dir($this->upload_dir)) {
    if (move_uploaded_file($tmp_file, $newfile)) {
     if ($this->replace == "y") {
      //system("chmod 0777 $newfile"); // maybe you need to use the system command in some cases...
      chmod($newfile , 0777);
     } else {
      // system("chmod 0755 $newfile");
      chmod($newfile , 0755);
     }
     return true;
    } else {
     return false;
    }
   } else {
    $this->message[] = $this->error_text(14);
    return false;
   }
  } else {
   $this->message[] = $this->error_text(15);
   return false;
  }
 }
 function check_dir($directory) {
  if (!is_dir($directory)) {
   if ($this->create_directory) {
    umask(0);
    mkdir($directory, 0777);
    return true;
   } else {
    return false;
   }
  } else {
   return true;
  }
 }
 function existing_file($file_name) {
  if ($this->replace == "y") {
   return true;
  } else {
   if (file_exists($this->upload_dir.$file_name)) {
    return false;
   } else {
    return true;
   }
  }
 }
 function get_uploaded_file_info($name) {
  $str = "File name: ".basename($name)."\n";
  $str .= "File size: ".filesize($name)." bytes\n";
  if (function_exists("mime_content_type")) {
   $str .= "Mime type: ".mime_content_type($name)."\n";
  }
  if ($img_dim = getimagesize($name)) {
   $str .= "Image dimensions: x = ".$img_dim[0]."px, y = ".$img_dim[1]."px\n";
  }
  return $str;
 }
 // this method was first located inside the foto_upload extension
 function del_temp_file($file) {
  $delete = @unlink($file); 
  clearstatcache();
  if (@file_exists($file)) { 
   $filesys = eregi_replace("/","\\",$file); 
   $delete = @system("del $filesys");
   clearstatcache();
   if (@file_exists($file)) { 
    $delete = @chmod ($file, 0775); 
    $delete = @unlink($file); 
    $delete = @system("del $filesys");
   }
  }
 }
 // some error (HTTP)reporting, change the messages or remove options if you like.
 function error_text($err_num) {
  switch ($this->language) {
   case "nl":
   $error[0] = "Foto succesvol kopieert.";
   $error[1] = "Het bestand is te groot, controlleer de max. toegelaten bestandsgrootte.";
   $error[2] = "Het bestand is te groot, controlleer de max. toegelaten bestandsgrootte.";
   $error[3] = "Fout bij het uploaden, probeer het nog een keer.";
   $error[4] = "Fout bij het uploaden, probeer het nog een keer.";
   $error[10] = "Selecteer een bestand.";
   $error[11] = "Het zijn alleen bestanden van dit type toegestaan: ".$this->ext_string."";
   $error[12] = "Sorry, de bestandsnaam bevat tekens die niet zijn toegestaan. Gebruik alleen nummer, letters en het underscore teken. 

Een geldige naam eindigt met een punt en de extensie.";
   $error[13] = "De bestandsnaam is te lang, het maximum is: ".$this->max_length_filename." teken.";
   $error[14] = "Sorry, het opgegeven directory bestaat niet!";
   $error[15] = "Uploading ".$this->the_file."...Fout! Sorry, er is al een bestand met deze naam aanwezig.";
   $error[16] = "Het gekopieerde bestand is hernoemd naar ".$this->file_copy.".";
   break;
   case "de":
   $error[0] = "Die Datei: ".$this->the_file." wurde hochgeladen!"; 
   $error[1] = "Die hochzuladende Datei ist gr??er als der Wert in der Server-Konfiguration!"; 
   $error[2] = "Die hochzuladende Datei ist gr??er als der Wert in der Klassen-Konfiguration!"; 
   $error[3] = "Die hochzuladende Datei wurde nur teilweise ?bertragen"; 
   $error[4] = "Es wurde keine Datei hochgeladen"; 
   $error[10] = "W?hlen Sie eine Datei aus!."; 
   $error[11] = "Es sind nur Dateien mit folgenden Endungen erlaubt: ".$this->ext_string."";
   $error[12] = "Der Dateiname enth?lt ung?ltige Zeichen. Benutzen Sie nur alphanumerische Zeichen f?r den Dateinamen 
mit Unterstrich. 
Ein g?ltiger Dateiname endet mit einem Punkt, gefolgt von der Endung."; 
   $error[13] = "Der Dateiname ?berschreitet die maximale Anzahl von ".$this->max_length_filename." Zeichen."; 
   $error[14] = "Das Upload-Verzeichnis existiert nicht!"; 
   $error[15] = "Upload ".$this->the_file."...Fehler! Eine Datei mit gleichem Dateinamen existiert bereits.";
   $error[16] = "Die hochgeladene Datei ist umbenannt in ".$this->file_copy.".";
   break;
   //
   // place here the translations (if you need) from the directory "add_translations"
   //
   default:
   // start http errors
   $error[0] = "File: ".$this->the_file." successfully uploaded!";
   $error[1] = "The uploaded file exceeds the max. upload filesize directive in the server configuration.";
   $error[2] = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the html form.";
   $error[3] = "The uploaded file was only partially uploaded";
   $error[4] = "No file was uploaded";
   // end  http errors
   $error[10] = "Please select a file for upload.";
   $error[11] = "Only files with the following extensions are allowed: ".$this->ext_string."";
   $error[12] = "Sorry, the filename contains invalid characters. Use only alphanumerical chars and separate parts of the
 name (if needed) with an underscore. 
A valid filename ends with one dot followed by the extension.";
   $error[13] = "The filename exceeds the maximum length of ".$this->max_length_filename." characters.";
   $error[14] = "Sorry, the upload directory doesn't exist!";
   $error[15] = "Uploading ".$this->the_file."...Error! Sorry, a file with this name already exitst.";
   $error[16] = "The uploaded file is renamed to ".$this->file_copy.".";
   
  }
  return $error[$err_num];
 }
}
?>

2，单文件上传的例子：

upload_dir = $_SERVER['DOCUMENT_ROOT']."/files/new/"; // "files" is the folder for the uploaded files (you have to create this folder) 
$my_upload->extensions = array(".png", ".zip", ".pdf"); // specify the allowed extensions here 
// $my_upload->extensions = "de"; // use this to switch the messages into an other language (translate first!!!) 
$my_upload->max_length_filename = 50; // change this value to fit your field length in your database (standard 100) 
$my_upload->rename_file = true; 
         
if(isset($_POST['Submit'])) { 
    $my_upload->the_temp_file = $_FILES['upload']['tmp_name']; 
    $my_upload->the_file = $_FILES['upload']['name']; 
    $my_upload->http_error = $_FILES['upload']['error']; 
    $my_upload->replace = (isset($_POST['replace'])) ? $_POST['replace'] : "n"; // because only a checked checkboxes is true 
    $my_upload->do_filename_check = (isset($_POST['check'])) ? $_POST['check'] : "n"; // use this boolean to check for a valid filename 
    $new_name = (isset($_POST['name'])) ? $_POST['name'] : ""; 
    if ($my_upload->upload($new_name)) { // new name is an additional filename information, use this to rename the uploaded file 
        $full_path = $my_upload->upload_dir.$my_upload->file_copy; 
        $info = $my_upload->get_uploaded_file_info($full_path); 
        // ... or do something like insert the filename to the database 
    } 
} 
?>  
 
 
 
php文件上传:
 
Max. filesize =  bytes.
 

选择文件：
新的文件名称： (without extension!)
是否替换
验证文件名称：

show_error_string(); ?>

".nl2br($info).""; ?>

3，多文件上传的例子

language) { 
            case "de": 
            // add you translations here 
            break; 
            default: 
            $extra_msg[1] = "Error for: ".$this->the_file.""; 
            $extra_msg[2] = "You have tried to upload ".$this->wrong_extensions." files with a bad extension, the following extensions
 are allowed: ".$this->ext_string.""; 
            $extra_msg[3] = "Select at least on file."; 
            $extra_msg[4] = "Select the file(s) for upload."; 
            $extra_msg[5] = "You have tried to upload ".$this->bad_filenames." files with invalid characters inside the filename."; 
        } 
        return $extra_msg[$msg_num]; 
    } 
    // this method checkes the number of files for upload 
    // this example works with one or more files 
    function count_files() { 
        foreach ($this->names_array as $test) { 
            if ($test != "") { 
                $this->number_of_files++; 
            } 
        } 
        if ($this->number_of_files > 0) { 
            return true; 
        } else { 
            return false; 
        }  
    } 
    function upload_multi_files () { 
        $this->message = ""; 
        if ($this->count_files()) { 
            foreach ($this->names_array as $key => $value) {  
                if ($value != "") { 
                    $this->the_file = $value; 
                    $new_name = $this->set_file_name(); 
                    if ($this->check_file_name($new_name)) { 
                        if ($this->validateExtension()) { 
                            $this->file_copy = $new_name; 
                            $this->the_temp_file = $this->tmp_names_array[$key]; 
                            if (is_uploaded_file($this->the_temp_file)) { 
                                if ($this->move_upload($this->the_temp_file, $this->file_copy)) { 
                                    $this->message[] = $this->error_text($this->error_array[$key]); 
                                    if ($this->rename_file) $this->message[] = $this->error_text(16); 
                                    sleep(1); // wait a seconds to get an new timestamp (if rename is set) 
                                } 
                            } else { 
                                $this->message[] = $this->extra_text(1); 
                                $this->message[] = $this->error_text($this->error_array[$key]); 
                            } 
                        } else { 
                            $this->wrong_extensions++; 
                        } 
                    } else { 
                        $this->bad_filenames++; 
                    } 
                }  
            } 
            if ($this->bad_filenames > 0) $this->message[] = $this->extra_text(5); 
            if ($this->wrong_extensions > 0) { 
                $this->show_extensions(); 
                $this->message[] = $this->extra_text(2); 
            } 
        } else { 
            $this->message[] = $this->extra_text(3); 
        } 
    } 
} 

$multi_upload = new muli_files; 

$multi_upload->upload_dir = $_SERVER['DOCUMENT_ROOT']."/files/"; // "files" is the folder for the uploaded files (you have to create this folder) 
$multi_upload->extensions = array(".png", ".zip"); // specify the allowed extensions here 
$multi_upload->message[] = $multi_upload->extra_text(4); // a different standard message for multiple files 
//$multi_upload->rename_file = true; // set to "true" if you want to rename all files with a timestamp value 
$multi_upload->do_filename_check = "y"; // check filename ... 
         
if(isset($_POST['Submit'])) { 
    $multi_upload->tmp_names_array = $_FILES['upload']['tmp_name']; 
    $multi_upload->names_array = $_FILES['upload']['name']; 
    $multi_upload->error_array = $_FILES['upload']['error']; 
    $multi_upload->replace = (isset($_POST['replace'])) ? $_POST['replace'] : "n"; // because only a checked checkboxes is true 
    $multi_upload->upload_multi_files(); 
} 
?>  
 
 
 
PHP 多文件上传:
 
Max. filesize =  bytes. (each) 
 

File 1:
File 2:
File 3:
Replace files?

show_error_string(); ?>