Upload Image to Telegraph with Curl

telegraph.php

<?php

public function uploadMedia($file)
{
    $target_url = "https://telegra.ph/upload";
    $file_name_with_full_path = $file;
    if (function_exists('curl_file_create')) { // php 5.5+
        $cFile = curl_file_create($file_name_with_full_path);
    } else { // 
        $cFile = '@' . realpath($file_name_with_full_path);
    }
    $post = array('file' => $cFile);
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $target_url);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    $res = curl_exec($ch);
    curl_close($ch);
    $res = json_decode(
        $res,
        true
    );
    if (isset($res[0]['src'])) {
        return 'https://telegra.ph' . $res[0]['src'];
    }
}