PHP forge POST

<?php
$post_data = array();
$post_data['text'] = $_POST['text']; //要POST的数据
 
$url = 'http://abc.baidu.com'; //目标地址
$o = '';
foreach ($post_data as $k => $v) $o .= '$k='.urlencode($v).'&';
 
$post_data = substr($o , 0,-1);
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
$result = curl_exec($ch);
?>