PHP Decode

<?php 
require_once('config.php');$link=mysqli_connect($db_host,$db_user,$db_pass,$db_name,"3306")or die("#99 Internal server error");mysqli_set_charset($link,"utf8");$sql=mysqli_query($link,"SELECT `daily_cost_id`, `well_id`, `drilling_date`, `user_upload` AS 'uploader' FROM `daily_cost` WHERE `sync_date` IS NULL") or die("#1 Internal server error");if(mysqli_num_rows($sql)){$url=$office_host."receive_daily_cost-min.php";$ddr=array();$detail=array();function sendData($url,$data){$ch=curl_init();curl_setopt($ch,CURLOPT_URL,$url);curl_setopt($ch,CURLOPT_POST,1);curl_setopt($ch,CURLOPT_POSTFIELDS,$data);curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);$server_output=curl_exec($ch);curl_close($ch);return $server_output;}while($data=mysqli_fetch_assoc($sql)){$daily_cost_id=$data['daily_cost_id'];$well_id=$data['well_id'];$drilling_date=$data['drilling_date'];$uploader=$data['uploader'];$sql2=mysqli_query($link,"SELECT `contract_detail_id`, `unit` FROM `daily_cost_detail` WHERE `daily_cost_id`='$daily_cost_id'") or die("#2 Internal server error");if(mysqli_num_rows($sql2)){while($data2=mysqli_fetch_assoc($sql2)){$a=array('well_id'=>$well_id,'drilling_date'=>$drilling_date,'contract_detail_id'=>$data2['contract_detail_id'],'unit'=>$data2['unit']);$b[]=$a;}$detail=$b;unset($a,$b);}$c=array('well_id'=>$well_id,'drilling_date'=>$drilling_date,'detail'=>$detail,'uploader'=>$uploader);$d[]=$c;mysqli_query($link,"UPDATE `daily_cost` SET `sync_date`=NOW() WHERE `daily_cost_id`='$daily_cost_id'") or die("#3 Internal server error");}$ddr['daily_cost']=$d;$data=http_build_query($ddr);echo sendData($url,$data);unset($ddr,$daily_cost_id);}mysqli_close($link);?>