resize multiple images while uploading - php

Question

Hi im trying to resize multiple image while uploading i have the function that resize but its only work for one image so please can anyone shom me how to loop this for multiple file upload
if( $_FILES['image']['size']< $max_file_size ){
// get file extension
$ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
// $ext = pathinfo($_FILES['files']['name'][$f], PATHINFO_EXTENSION);
if (in_array($ext, $valid_exts)) {
/* resize image */
foreach ($sizes as $w => $h) {
$files[] = resize($w, $h);
}
} else {
$msg = 'Unsupported file';
}
} else{
$msg = 'Please upload image smaller than 200KB';
}

Answer 1

This is untested, but might give you an idea.
The way this works is by looping through all of the $_FILES of the variable $iname which is 'image'. I set this since it's used multiple times, so if you ever change it, its easier.
I create a new variable called $image which will be the variables for that specific image. I do this by looping through all of the variables of $_FILES[$iname]. I set the $image variable to the $key and the new value, which will be an array. We reference the correct array using the $i variable.
Next I simply use your existing code. Since the resize() function only calls for width and height, I am unsure what happens here. Another parameter should be passed to reference the image you want to resize, which will be $image.
From the visible code I typed, not knowing what resize() is, this code is insecure. You should really check more than just the file extension since it can easily be changed. I usually use exif to check the image header. I also never store the data users upload unless I re-encode it using a GDI function in PHP.
Hopefully this will get you started.
$i = 0;
$iname = 'image';
for($i = 0; $i < count($_FILES[$iname]['size']); $i++) {
// Create new Image Array
$image = array();
foreach($_FILES[$iname] as $key => $val) {
$image[$key] = $val[$i];
}
if( $image['size'] < $max_file_size ) {
$ext = strtolower(pathinfo($_FILES['image']['name'], PATHINFO_EXTENSION));
if (in_array($ext, $valid_exts)) {
foreach ($sizes as $w => $h) {
// How is resize getting the $_FILES?
// Should pass a variable of $image and use it instead
$files[] = resize($w, $h);
}
} else {
$msg = 'Unsupported file';
}
} else{
$msg = 'Please upload image smaller than 200KB';
}
}