上載檔案

<form action="<?echo getenv('SCRIPT_NAME');?>" method="POST" enctype="multipart/form-data">
<input type="file" name="filename">
<input type="submit" name="Submit">
</form>

//防止檔案大過 1,000,000 bytes (~ 1MB)，單位計算參看 wikipedia
$_FILES["filename"][size] > 1000000

//容許檔案類型，參看 Mine-type 對照
$_FILES["filename"][type] == "text/plain"

//儲存檔案
move_uploaded_file($_FILES["filename"]["tmp_name"], $target_path)