file_get_contentsでPOSTする

sendPost.php

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

if ( ! function_exists('send_post'))
{
    function send_post($data,$url)
    {
        $header = array(
            "Content-Type: application/x-www-form-urlencoded",
            "Content-Length: ".strlen($data)
        );

        $context = array(
            "http" => array(
                "method"  => "POST",
                "header"  => implode("\r\n", $header),
                "content" => $data
            )
        );
        return file_get_contents($url, false, stream_context_create($context));
    }
}

?>