How to Send a File via cURL from a Form POST in PHP?

Send File via cURL from Form POST in PHP

When handling file uploads from a form POST in PHP, it's essential to understand how to utilize cURL to send the file. Form markup usually includes a file input field with enctype="multipart/form-data".

To send a file using cURL with a POST request, use the following approach:

1. Retrieve the file path: Use $_FILES'image' to obtain the temporary file path on the server.
2. Prepare the cURL parameters: Construct an array with the file details. E.g.:

$post = array(
    'image' => '@' . $_FILES['image']['tmp_name']
);

3. Initialize cURL:

   $ch = curl_init();

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4. Set cURL options:

   curl_setopt($ch, CURLOPT_URL, 'http://example.com/curl_receiver.php');
   curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

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5. Execute the request:

   curl_exec($ch);

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6. Close cURL:

   curl_close($ch);

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On the receiving end, a script like curl_receiver.php can receive the file:

if (isset($_FILES['image'])) {
    move_uploaded_file($_FILES['image']['tmp_name'], 'uploads/'.$_FILES['image']['name']);
}
?>

Example:

Form:

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

Script (script.php):

if (isset($_POST['upload'])) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://example.com/curl_receiver.php');
    curl_setopt($ch, CURLOPT_POSTFIELDS, array(
        'image' => '@' . $_FILES['image']['tmp_name']
    ));
    curl_exec($ch);
    curl_close($ch);
}

Receiver Script (curl_receiver.php):

if (isset($_FILES['image'])) {
    move_uploaded_file($_FILES['image']['tmp_name'], 'uploads/'.$_FILES['image']['name']);
}

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