How to Upload Files Using cURL in PHP?

Uploading Files with cURL in PHP

To upload a file in PHP using cURL, follow these steps:

1. Create a cURL File Object

For PHP 5.5 and above, use curl_file_create to create a cURL file object:

if (function_exists('curl_file_create')) { // php 5.5+
  $cFile = curl_file_create($file_name_with_full_path);
}

For earlier PHP versions, use:

$cFile = '@' . realpath($file_name_with_full_path);

2. Prepare the POST Data

Package the file object and any additional form data in a POST array:

$post = array('extra_info' => '123456', 'file_contents' => $cFile);

3. Initialize the cURL Session

$ch = curl_init();

4. Set the cURL Options

Configure the cURL session options:

curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);

5. Execute the Request

Send the file using cURL:

$result = curl_exec ($ch);

6. Close the cURL Session

curl_close ($ch);

Important Note for PHP 5.5 and Above:

Deprecated file handling methods are used in the provided example. For current practices, refer to the PHP documentation: https://wiki.php.net/rfc/curl-file-upload

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