php - How can I overwrite a file, when the file I want to upload already exists? -

i want overwrite file, if exists in folder. here code:

index.php

<form action="check.php" method="post" enctype="multipart/form-data">     <input type="file" name="file">     <button type="submit" value="upload">upload</button> </form>  

check.php

if(isset($_files['file'])) {     $file = $_files['file'];     $target_file = 'files/'.basename($_files["file"]["name"]);     if (file_exists($target_file)) {         echo "file exist";                           echo "<form action='overwrite.php' method='post'>                 <button type='submit'> overwrite</button>             </form>";     }  } 

overwrite.php

move_uploaded_file($_files["file"]["tmp_name"], $target_file); echo "the file overwritten"; 

---

update: did mistake in question. changed it. on check.php there should statement "file exists" , button directs overwrite.php , overwrite file. (no second input field)

when creating form again need specify enctype="multipart/form-data"

 echo "<form action='overwrite.php' method='post' enctype='multipart/form-data'>         <input type='file' name='file'>         <button type='submit'> overwrite</button>     </form>"; 

without enctype="multipart/form-data"it wont let perform file upload operation

other name should not value should static can use