Get any site data in .txt file using curl in php? - php

Question

I am trying to get the data of any website in my .txt file using curl in php.
so there is some issue in code. yesterday i get the data in web_content.txt file. But i don not know why and where error generate i am not getting the site url in .txt file.
Here is my code you can check and please help me what should i do to remove this error and get the data.
<?php
if($_REQUEST['url_text'] == "") {
echo "<div class='main_div border_radius'><div class='sub_div'> Please type any site URL.</div></div>";
} else {
$site_url = $_REQUEST['url_text'];
$curl_ref=curl_init();//init the curl
curl_setopt($curl_ref,CURLOPT_URL,$site_url);// Getting site
curl_setopt($curl_ref,CURLOPT_CONNECTTIMEOUT,2);
curl_setopt($curl_ref,CURLOPT_RETURNTRANSFER,true);
$site_data = curl_exec($curl_ref);
if (empty($site_data)) {
echo "<div class='main_div border_radius'><div class='sub_div'> Data is not available.</div></div>";
}
else {
echo "<div class='main_div border_radius'><div class='sub_div'>".$site_data."</div></div>";
}
$fp = fopen("web_content.txt", "w") or die("Unable to open file!");//Open a file in write mode
curl_setopt($curl_ref, CURLOPT_FILE, $fp);
curl_setopt($curl_ref, CURLOPT_HEADER, 0);
curl_exec($curl_ref);
curl_close($curl_ref);
fclose($fp);
}
?>
if(isset($_GET['start_tag_textbox']) && ($_GET['end_tag_textbox'])) {
get_tag_data($_GET['start_tag_textbox'],$_GET['end_tag_textbox']);
}
header('content-type: text/plain');
function get_tag_data ($start,$end) {
$file_data= "";
$tag_data = "";
$file = fopen("web_content.txt","r");
$file_data = fread($file,filesize("web_content.txt"));
fclose($file);
$last_pos = strpos($start,'>');
$start = substr_replace($start,".*>",$last_pos);
preg_match_all('#'.$start.'(.*)'.$end.'#U',$file_data,$matches);
for($i=0; $i<count($matches[1]);$i++){
echo $matches[1][$i]."\n";
}
}
?>
<?php
$url = "http://www.ucertify.com";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$output = curl_exec($ch);
curl_close($ch);
$file = fopen("web_content.txt","w");
fwrite($file,$output);
fclose($file);
?>