<?php
$ch = curl_init('http://localhost/html/admin/bbs/content_save.php');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, [
    'title' => 'Test title',
    'category_code' => 'CA10001'
]);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
echo "Response: " . curl_exec($ch);