Upload does not work $ _FILES undefined index error

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10

When uploading a file I'm getting the following error:

  

Notice: Undefined index: file in Z: \ web \ upload.php on line 3

upload.php: 

<?php
$location = 'uploads/';
$arquivo = $_FILES['file'];

if ($arquivo) {
    $name = $arquivo['name'];
    $tmp_name = $arquivo['tmp_name'];

    $error = $_FILES['file']['error'];
    if ($error !== UPLOAD_ERR_OK) {
        echo 'Erro ao fazer o upload:', $error;
    } elseif (move_uploaded_file($tmp_name, $location . $name)) {
        echo 'Uploaded';    
    }
}

Form: 

<form action="upload.php" method="POST">
    <input type="file" name="file">
    <input type="submit" value="Submit">
</form>
    
asked by anonymous 17.02.2015 / 15:09

1 answer

19

To upload files it is necessary to set enctype to multipart/form-data in tag <form>

Example: 

<form enctype="multipart/form-data" action="upload.php" method="POST">

In addition it is recommended to use isset to do the error treatments: 

if (isset($_FILES['file'])) {
    $arquivo = $_FILES['file'];
    $tmp_name = $_FILES['file']['tmp_name'];

The code should look like this:

upload.php 

<?php
$location = 'uploads/';

if (isset($_FILES['file'])) {
    $name = $_FILES['file']['name'];
    $tmp_name = $_FILES['file']['tmp_name'];

    $error = $_FILES['file']['error'];
    if ($error !== UPLOAD_ERR_OK) {
        echo 'Erro ao fazer o upload:', $error;
    } elseif (move_uploaded_file($tmp_name, $location . $name)) {
        echo 'Uploaded';    
    }
} else {
    echo 'Selecione um arquivo para fazer upload';
}

Form: 

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

What is enctype ?

The enctype attribute defines how the form data will be encoded when sending the data to the server, there are 3 types of values for this attribute:

  • application/x-www-form-urlencoded This is the default value. In it all characters are encoded before being sent, for example spaces are exchanged for + and special characters are converted to HEX ASCII values.

  • multipart/form-data It does not encode the data, you should use this value when uploading.

  • % of spaces are converted to text/plain signs, but other characters will not be encoded.

17.02.2015 / 15:09
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