Multiple File Extensions validate using PHP.

<?php
    $valid_file_extensions = array(".jpg", ".jpeg", ".gif", ".png");
    
    $file_extension = strrchr($_FILES["file"]["name"], ".");
    
    // Check that the uploaded file is actually an image
    // and move it to the right folder if is.
    if (in_array($file_extension, $valid_file_extensions)) {
        $destination = "uploads/" . $_FILES["file"]["name"];
        move_uploaded_file($_FILES["file"]["tmp_name"], $destination);
    }
?>