如何使用PHP验证多个上传的文件？

Question

I am using PHP to upload multiple file to the database. So when I check file extension its always showing me my given error message even if file extension is correct:

File type is not allowed, We accept only .jpg, .png and .gif extension file

Here is the validation :

$total = count($_FILES['client_doc']['name']);                  
for($i=0; $i<$total; $i++) {
    $file_name = htmlspecialchars($_FILES['client_doc']['name'][$i]);
    $file_tmp =  htmlspecialchars($_FILES['client_doc']['tmp_name'][$i]);
    $file_size = htmlspecialchars($_FILES['client_doc']['size'][$i]);
    $file_ext = explode('.', $file_name);
    $file_ext = strtolower(end($file_ext));
    $allowed_type =  array('jpg', 'jpeg', 'gif', 'png');
}

if(!empty($file_name)) {
    if(!in_array($file_ext, $allowed_type)) {
        $msg[] = 'File type is not allowed, We accept only .jpg, .png and .gif extension file';
        $msg['error'] = true;
    }elseif($file_size > 2097152) { // only 2 mb size is allowed
        $msg[] = 'Uploaded file name must be less than 2MB';
        $msg['error'] = true;                            
    }
}

Answer 1

I've tested your code by giving the $file_name variable test.png value and it works fine. Are you sure your file form works correctly? Try to echo $file_name's at the end of for loop and check if there's any output.

Another tips:

1. Do you want to validate all the files? As far as I'm concerned your current code validates only the last file - you iterate through all the files, but you overwrite variables storing file's data. In order to validate all the elements you have to put your condition inside the for loop.
2. Because your $allowed_type is a constant, you don't have to overwrite it inside the loop.