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How to use cURL to upload files in PHP

2019-11-18 23:43:46

label: PHP, PHP5.5, cURL, CURLOPT_POSTFIELDS, File Upload, CURLFille, PHP upload file

PHP uses the libcurl library created by Daniel Stenberg to connect to various servers. The protocols it supports are http、https、ftp、gopher、telnet、dict、file、ldap. Libcurl also supports HTTPS certificates, POST, PUT, FTP, etc. It also supports form-based uploading, proxy, cookies, username + password authentication.

PHP uses the cURL library to initiate these HTTP requests. cURL depends on libcurl7.10.5 or above.

In PHP 5.4 or earlier, the encapsulation of cURL upload files is procedural:

$ch = curl_init();
$data = array('name' => 'File1', 'file' => '@/path/to/file.png');
curl_setopt($ch, CURLOPT_URL, 'https://localhost/upload.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_exec($ch);

In PHP 5.5 or later, the encapsulation of the cURL upload file is updated to the CURLFille class:

$ch = curl_init();
$data = array('name' => 'File1', 'file' => new CURLFille('/path/to/file.png'));
curl_setopt($ch, CURLOPT_URL, 'https://localhost/upload.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_SAFE_UPLOAD, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_exec($ch);

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