HTML not posting file to PHP-CodePudding

Here is my code:

<html>
<body>

<div>
    <form action="<?=$_SERVER['PHP_SELF'];?>" method="post">
      <input type="file" id="myFile" name="filename">
      <input type="submit" name="Submit">
    </form>
</div>


<?php
if(isset($_POST['Submit']))
{
    $file = $_POST["myFile"];
    echo("hello");
}


?>

</body>
</html>

when I run it and input a file it says: Undefined array key "myFile"

what am I doing wrong?

CodePudding user response：

Uploaded files don't get added to the $_POST array but they are loaded into the $_FILES array. Try check that out.

You can then use the move_uploaded_file() to save it wherever you want.

Important: as soon as the script execution is over, the temporary uploaded file is removed if it was not saved somewhere else with move_uploaded_file().

CodePudding user response：

Add on form enctype="multipart/form-data"

This value is necessary if the user will upload a file through the form.

Your file type name is "filename".

<html>
<body>

<div>
    <form action="<?=$_SERVER['PHP_SELF'];?>" method="post" enctype="multipart/form-data">
      <input type="file" id="myFile" name="filename">
      <input type="submit" name="Submit">
    </form>
</div>


<?php
if(isset($_POST['Submit']))
{
    $file = $_POST["filename"];
    echo("hello");
}


?>

</body>
</html>

CodePudding user response：

The request transfers the data using the names of the form fields and not the IDs, the file data can be found in the global variable $_FILES.

Use $file = $_FILES['filename']['name']; for the name of the uploaded file

or $file = $_FILES['filename']['tmp_name']; for the temporary file path of the uploaded file.