i need more of an understaning of the following...

[son.of.the.morning]

I would like to have more of a understanding of this upload file script if any one would like to be a pal and explain whats going on step by step, thats if it's not to much to ask of course .

 

<?php
                /* checking the file extension*/
                if ((($_FILES["file"]["type"] == "image/gif")
                || ($_FILES["file"]["type"] == "image/jpeg")
                || ($_FILES["file"]["type"] == "image/png")))
{
                /* this code will be executed if the file extension matches they above (gif,jpeg,png)*\
  		if ($_FILES["file"]["error"] > 0) /*if more than 0 errors occur the following code will be executed*/ 
                                    {
                                      /* return code (string), $_FILES...(file var)*/
                                          echo "Return Code: " . $_FILES["file"]["error"] . "<br />";
   				 }
  else  {
                   /*listing file details, name, file type, file size*/
                  echo "Upload: " . $_FILES["file"]["name"] . "<br />";
                  echo "Type: " . $_FILES["file"]["type"] . "<br />";
                  echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
                  /*temp file location*/
                  echo "Temp file: " . $_FILES["file"]["tmp_name"] . "<br />";
                  if (file_exists("upload/" . $_FILES["file"]["name"]))
                                {
                                       /* if there is a file already existing  with the same name as the current file in a procedure then the following code will be executed*/
                                       echo $_FILES["file"]["name"] . " already exists. ";
                         }
  else    {
                  /*moving the successfully uploaded file to the a designated location, in this case upload/.*/
                  move_uploaded_file($_FILES["file"]["tmp_name"],
                  "upload/" . $_FILES["file"]["name"]);
                  echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
             }
       }
  }
else   {
          /*this section refers from the first if statement, if the file extension didn’t match the files listed at the beginning of this script then the following code will be executed.*/
             echo "Invalid file extention”
}
?>

[objnoob]

It's already commented  for you  

[son.of.the.morning]

haha i know i commented it but i still feel thre is more to it thats am not geting.

[objnoob]

Which part would you like a more understanding of?

[son.of.the.morning]

i dont get this "error" does it mean an error during the uload

echo "Return Code: " . $_FILES["file"]["error"] . "<br />";

 

/1024 ???

echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";

 

other than these i think i get it

[wildteen88]

i dont get this "error" does it mean an error during the uload

echo "Return Code: " . $_FILES["file"]["error"] . "<br />";

 

$_FILES["file"]["error"] will contain an error code if their is a problem when uploading the file. All possible error codes are stated in the manual here

http://php.net/manual/en/features.file-upload.errors.php

 

/1024 ???

echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";

 

$_FILES["file"]["size"] stores the files size of the uploaded file. The file size is measured in bytes.

This operation here

$_FILES["file"]["size"] / 1024

Is dividing (thats what the / stands for) the uploaded files file size by 1024 to convert the file size from bytes to kilobytes (There are 1024 bytes in a kilobyte (KB))

 

For more information on how PHP handles file uploads have read of the documentation here

http://php.net/manual/en/features.file-upload.php

[son.of.the.morning]

Thanx once again dude!

[ignace]

If you have trouble understanding your code or someone else's consider re-factoring the code:

 

if(upload_exists($_FILES['file'], 'directory')) {
    echo 'Upload already exists.';
} else if(!upload_is_valid($_FILES['file'])) {
    echo 'Invalid upload.';
} else if(!upload_store($_FILES['file'])) {
    echo 'Could not store the file.';
} else {
    echo 'File successfully created.';
}

function upload_is_valid($upload, $valid_mime, $valid_ext) {
    if($upload['error'] != UPLOAD_ERR_OK)
        return false;
  
    $finfo = finfo_open(FILEINFO_MIME_TYPE); // Note: PHP 5.3.x
    if(!in_array(finfo_file($finfo, $upload['tmp_name']), (array) $valid_mime))
        return false;
    
    if(!in_array(pathinfo($upload['tmp_name'], PATHINFO_EXTENSION), (array) $valid_ext))
        return false;
    
     return true;
}

function upload_exists($upload, $directory) {
    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);
    return file_exists(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);
}

function upload_store($upload, $directory) {
    $upload = upload_create($upload);
    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);
    return move_uploaded_file(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);
}

function upload_create($upload) {
    // re-create the image
    return $upload;
}

[son.of.the.morning]

i understand yours allot less then i do mine. lol

[ignace]

So these 9 lines are harder to comprehend then your 30-40 lines of code?

 

if(upload_exists($_FILES['file'], 'directory')) {
    echo 'Upload already exists.';
} else if(!upload_is_valid($_FILES['file'])) {
    echo 'Invalid upload.';
} else if(!upload_store($_FILES['file'])) {
    echo 'Could not store the file.';
} else {
    echo 'File successfully created.';
}

[son.of.the.morning]

I was actualy refering to...

function upload_is_valid($upload, $valid_mime, $valid_ext) {    if($upload['error'] != UPLOAD_ERR_OK)        return false;      $finfo = finfo_open(FILEINFO_MIME_TYPE); // Note: PHP 5.3.x    if(!in_array(finfo_file($finfo, $upload['tmp_name']), (array) $valid_mime))        return false;        if(!in_array(pathinfo($upload['tmp_name'], PATHINFO_EXTENSION), (array) $valid_ext))        return false;         return true;}function upload_exists($upload, $directory) {    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);    return file_exists(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);}function upload_store($upload, $directory) {    $upload = upload_create($upload);    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);    return move_uploaded_file(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);}function upload_create($upload) {    // re-create the image    return $upload;}

[son.of.the.morning]

This part even...[

function upload_is_valid($upload, $valid_mime, $valid_ext) {    if($upload['error'] != UPLOAD_ERR_OK)        return false;      $finfo = finfo_open(FILEINFO_MIME_TYPE); // Note: PHP 5.3.x    if(!in_array(finfo_file($finfo, $upload['tmp_name']), (array) $valid_mime))        return false;        if(!in_array(pathinfo($upload['tmp_name'], PATHINFO_EXTENSION), (array) $valid_ext))        return false;         return true;}function upload_exists($upload, $directory) {    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);    return file_exists(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);}function upload_store($upload, $directory) {    $upload = upload_create($upload);    $filename = pathinfo($upload['tmp_name'], PATHINFO_FILENAME);    return move_uploaded_file(rtrim($directory, '\/') . DIRECTORY_SEPARATOR . $filename);}function upload_create($upload) {    // re-create the image    return $upload;