How to Upload Files Using PHP cURL from a Form POST?

PHP Curl File Upload from Form POST

Uploading files with POST forms can be challenging, especially when using cURL on the server-side. To address this, consider the following approach:

Server-Side cURL Implementation

To handle file uploads and send them via cURL, you can utilize PHP's $_FILES superglobal, which provides information about uploaded files. Here's a code snippet that demonstrates the process:

if (isset($_POST['upload'])) {
    $fileKey = 'image'; // Assuming your file input has 'image' as its name

    // Retrieve file information
    $tmpFile = $_FILES[$fileKey]['tmp_name'];
    $fileName = $_FILES[$fileKey]['name'];

    // Prepare cURL parameters
    $postFields = ['file' => '@' . $tmpFile, /* Other post parameters if needed */];
    $url = 'https://example.com/curl_receiver.php'; // URL to send the file to

    // Initialize and configure cURL
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $postFields);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    // Execute cURL request
    $result = curl_exec($ch);

    // Handle cURL response
    if (curl_errno($ch)) {
        // Handle error
    } else {
        // Success, do further processing with $result
    }

    // Close cURL connection
    curl_close($ch);
}

Receiving Script (curl_receiver.php)

<?php
// Handle incoming POST data
if (!empty($_FILES)) {
    // Retrieve file information
    $tmpFile = $_FILES['file']['tmp_name'];
    $fileName = $_FILES['file']['name'];

    // Process and save the uploaded file
    // ...

    // Send response to the client
    echo json_encode(['status' => 'success']);
} else {
    // Handle error, no file uploaded
    echo json_encode(['status' => 'error', 'message' => 'No file uploaded']);
}
?>

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