php explode文件扩展名为null

So, when I upload files, i want to check which file extension it is:

$files      = $_FILES['files'];

$files_name      =  $files['name'];     

Shows: `"img.jpg"'

$files_name_explode = end(explode('.', $files_name));

Getting null.

What am I doing wrong?

Thanks

Use below code :

$path = $_FILES['files']['name'];
$ext = pathinfo($path, PATHINFO_EXTENSION);

Hope it will help you :)

Instead of explode you can use pathinfo.

Use

$files_name_explode = pathinfo($filename, PATHINFO_EXTENSION);

pathinfo() can give you other information, such as canonical path, depending on the constant you pass to it.

try this :full code to validate using in_array($file_extension, $validextensions)

if(isset($_FILES["file"]["type"])) 
{
    $validextensions = array("jpeg", "jpg", "png","JPG");
    $temporary = explode(".", $_FILES["file"]["name"]);
    $file_extension = end($temporary);
    if ((($_FILES["file"]["type"] == "image/png") || ($_FILES["file"]["type"] == "image/jpg") || ($_FILES["file"]["type"] == "image/jpeg")
    ) && ($_FILES["file"]["size"] < 1000000)//Approx. 100kb files can be uploaded.
    && in_array($file_extension, $validextensions)) {
        if ($_FILES["file"]["error"] > 0)
        {
            //echo "Return Code: " . $_FILES["file"]["error"] . "<br/><br/>";
        }
        else
        {


    $file_name=$_FILES["file"]["name"];
    $rand_file_name=rand()."_".$file_name;

                $sourcePath = $_FILES['file']['tmp_name']; // Storing source path of the file in a variable


                $targetPath = "../upload/". $rand_file_name; // Target path where file is to be stored
                move_uploaded_file($sourcePath,$targetPath); // Moving Uploaded file                

        }
    }
    else
    {
        //echo "<span id='invalid'>***Invalid file Size or Type***<span>";
    }
}