how can I add imaging handling got this script effectively - php

Question

hopefully someone can help me here. been up all night browsing and nothing I try seems to work, but im new to php so im slow. I need to upload 6 images, and this works great. but then I realized you can upload not only images but all other file types. Im trying to be able to limit it to just images under 100kb each. heeeeelllllllpppppp!!!! please!
function findexts ($filename) { $filename = strtolower('$filename') ;
$exts = preg_split("[/\\.]", $filename) ;
$n = count($exts)-1;
$exts = $exts[$n];
return $exts;
}
$ext = findexts ($_FILES['images']['name']) ;
$ran = rand ();
$ran2 = $ran.".";
while(list($key,$value) = each($_FILES['images']['name']))
{
if(!empty($value))
{
$filename = $ran.$value;
$filename=str_replace(" "," _ ",$filename);// Add _ inplace of blank space in file name, you can remove this line
$add = "media/".$ran."$filename";
$insert_query = "INSERT INTO ....VALUES ...";
//echo $_FILES['images']['type'][$key];
// echo "<br>";
copy($_FILES['images']['tmp_name'][$key], $add);
chmod("$add",0777);
mysql_query($insert_query);
}
}

Answer 1

See the answer to both your questions here:
https://stackoverflow.com/a/9153419/723855
Add this function to your script (modified from link):
function acceptFileUpload($thefile){
if(isset($_FILES[$thefile])) {
$errors = array();
$maxsize = 2097152;
$acceptable = array(
'application/pdf',
'image/jpeg',
'image/jpg',
'image/gif',
'image/png'
);
if(($_FILES[$thefile]['size'] >= $maxsize) || ($_FILES[$thefile]["size"] == 0)) {
$errors[] = 'File too large. File must be less than 2 megabytes.';
}
if(!in_array($_FILES[$thefile]['type'], $acceptable)) && (!empty($_FILES[$thefile]["type"]))) {
$errors[] = 'Invalid file type. Only PDF, JPG, GIF and PNG types are accepted.';
}
if(count($errors) !== 0) {
return true;
} else {
foreach($errors as $error) {
echo '<script>alert("'.$error.'");</script>';
return false;
}
die(); //Ensure no more processing is done
}
}
}
Then in your script change your while loop to use this function to check for a valid file:
while(list($key,$value) = each($_FILES['images']['name']))
{
if(!empty($value))
{
if(acceptFileUpload('images'))
{
$filename = $ran.$value;
$filename=str_replace(" "," _ ",$filename);// Add _ inplace of blank space in file name, you can remove this line
$add = "media/".$ran."$filename";
$insert_query = "INSERT INTO ....VALUES ...";
//echo $_FILES['images']['type'][$key];
// echo "<br>";
copy($_FILES['images']['tmp_name'][$key], $add);
chmod("$add",0777);
mysql_query($insert_query);
}
}
}
I might not have that parameter right that is getting passed to acceptFileUpload().

Answer 2

Four functions to run on the processing script on each file, if all tests pass then the file meets your conditions and can be safely stored (png / jpg / gif + non-zero + 10Kb limit + is uploaded file)
//Example Call: checkFileExtension($_FILES['fieldname']['name']);
function checkFileExtension($filename) {
$filename = strtolower($filename) ;
$filenamePartsArray = preg_split("[/\\.]", $filename) ;
$extension = $filenamePartsArray[count($filenamePartsArray) - 1];
if (($extension == 'gif') || ($extension == 'jpeg') || ($extension == 'jpg') || ($extension == 'png')) {
return true;
} else {
return false;
}
}
//Example Call: checkFileMIME($_FILES['fieldname']['type']);
function checkFileMIME($filetype) {
if (($filetype == 'image/png') || ($filetype == 'image/jpeg') || ($filetype == 'image/gif')) {
return true;
} else {
return false;
}
}
//Example Call: checkFileSize($_FILES['fieldname']['size'], 10);
function checkFileSize($filesize, $limitKb = 0) {
if ($filesize == 0) {
return false;
}
if ($limitKb != 0) {
if ($filesize > ($limitKb * 1024)) {
return false;
}
}
return true;
}
//Native Call: is_uploaded_file($_FILES['fieldname']['tmp_name']);
Edit: pseudo example use
foreach ($_FILES as $fieldname => $file) {
if ((checkFileExtension($file['name'])) && (checkFileMIME($file['type'])) && (checkFileSize($file['size'], 10)) && (is_uploaded_file($file['tmp_name']))) {
//Move the image with move_uploaded_file
//Save the file location with DB insert
}
}

Answer 3

you can check the file type with
$_FILES['image']['type']
or if you want to check the extension too
$extension = explode('.',(string)$_FILES['image']['name']);
//then check if its "jpg", "gif" or "png"
the file size can be checked with
$_FILES['image']['size']
so your script should be like this for each of your image updates:
$extension = explode('.',$_FILES['image']['name']);
$imgextensions = array();
$size = $_FILES['image']['size'];
if(($extension == 'jpg' || $extension == 'gif' || $extension == 'png') &&
$size < 100000 ){
// upload your file to your filesystem
}else{
//inform the user
}