CURL work on localhost not on server - php

Question

i am totaly new to CURL thing . i have a problem .
i have the below script which supposed to get remote files using a proxy , i am trying this code on my local host machine and it is working great "done successfully part: .
when i run it from server , it just keep going to the "invalid proxy" although it is same proxy as used in the local host ..
<?php
$dots = '';
include($dots.'classes/config.php');
$wordsLimitPerCall = 1;
$maxAttemptsTrials = 3;
$timeout = 10; // Seconds
$proxy = sqlSelectRow('proxy', array(
'condition'=>'not_valid=0',
'order'=>'rand()'
));
echo '<ul>';
if($proxy)
echo '<li>Using proxy: '.$proxy['proxy'].':'.$proxy['port'].'</li>';
$wordsRes = sqlSelectRows('words', array(
'condition'=>'is_done=0 and trials<'.$maxAttemptsTrials,
'limit'=>$wordsLimitPerCall,
'order'=>'created asc'
));
while($arr = $wordsRes->fetch_assoc()) {
$word = urlencode($arr['word']);
$url = 'http://example.com'.$word;
$callSettings = array(
'method'=>'curl',
'timeout'=>$timeout
);
if($proxy)
$callSettings['proxy'] = $proxy['proxy'].':'.$proxy['port'];
$result = callRemoteURL($url, $callSettings);
$filename = urldecode($word);
$filename = 'file/'.$arr['id'].' - '.$filename.'.mp3';
echo '<li>Getting the word: '.$word.'</li>';
if($result && strpos($result, '<html')===false) {
if(file_exists($dots.$filename))
unlink($dots.$filename);
fileWrite($filename, $result);
$is_done = 1;
echo '<li>done successfully</li>';
}
else {
$is_done = 0;
if($proxy) {
sqlUpdate('proxy', array(
'not_valid'=>0
), array(
'condition'=>'id='.$proxy['id']
));
echo '<li>Proxy is not valid</li>';
}
}
sqlUpdate('words', array(
'trials'=>$arr['trials']+1,
'path'=>$url,
'last_call_date'=>date('Y-m-d H:i:s'),
'is_done'=>$is_done
), array(
'condition'=>'id='.$arr['id']
));
}
echo '</ul>'; ?>
below the function called from utils
<? php
if($set['method']=='curl' && extension_loaded('curl'))
{
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT ,0);
curl_setopt($ch, CURLOPT_TIMEOUT, $set['timeout']); // Seconds
if($set['proxy'])
curl_setopt($ch, CURLOPT_PROXY, $set['proxy']);
ob_start();
if(curl_exec($ch) === false)
{
$errorNo = curl_errno($ch);
if($errorNo==28)
print_r('The connection took time more than '. $set['timeout'].' seconds, so we disconnected the process');
else
if($errorNo!=7)
print_r(curl_error($ch));
$result=false;
}
else
{
$result = ob_get_contents();
}
ob_end_clean();
return $result;
}
?>
sorry if its too long ... but i've spent the last couple days tryng to find out . any idea or what shall i do ?