how to calculate google backlinks using php - php

Question

i want to create my own tool for back-links calculation using PHP. is there any api to fetech the data for back links

Answer 1

The full implementation in PHP would look something like this:
<?php
$domain = "example.com"; // Enter your domain here.
$url = "http://ajax.googleapis.com/ajax/services/search/web?v=1.0&rsz=large&"
. "q=link:".$domain;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, $domain);
$body = curl_exec($ch);
curl_close($ch);
$json = json_decode($body);
$urls = array();
foreach($json->responseData->results as $result) // Loop through the objects in the result
$urls[] = $result->unescapedUrl; // and add the URL to the array.
?>
Basically you edit the domain variable at the top and it will fill the $urls array with unescaped URLs linking to the domain.
EDIT: I've edited the link to return 8 results. For more, you'll have to parse the pages and loop through them with the start parameter. See the Class Reference for more information.

Answer 2

Run a Google search with the URL prefixed by link: - for instance, link:www.mydomain.com.
While Google does provide a more specific backlink overview in their Webmaster Tools area (more info), I'm not sure they provide an external API for it.

Answer 3

since the question is "how to use in php code?" I assume you want to process on the server side as opposed to ajax on the client side. So use the Google URL link: hack in combination with curl
http://php.net/manual/en/book.curl.php

Answer 4

There is also a PHP class with many more options, that you can use: http://code.google.com/p/seostats/

Answer 5

function load_content ($url, $auth = true,$auth_param) {
$curl = curl_init();
$uagent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)";
if ($auth){
curl_setopt($curl, CURLOPT_USERPWD,$auth_param);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_USERAGENT, $uagent);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 3);
$content = curl_exec($curl);
//$header = curl_getinfo($curl);
curl_close($curl);
$res['msg'] = "";//$header;
$res['content'] = $content;
return $res;
}
function google_indexed($url){
$html = load_content ($url,false,"");
return $html;
}
Example:
<?php
$domain = "google.com";
$indexed["google"] = google_indexed("http://ajax.googleapis.com/ajax/services/search/web?v=1.0&q=site:$domain");
http://alex-kurilov.blogspot.com/2012/09/backlink-checker-google-php-example.html

Answer 6

For finding External links to the page : (external backlinks)
<?php
$url = "any url";
$result_in_html = file_get_contents("http://www.google.com/search?q=link:{$url}");
if (preg_match('/Results .*? of about (.*?) from/sim', $result_in_html, $regs))
{
$indexed_pages = trim(strip_tags($regs[1])); //use strip_tags to remove bold tags
echo ucwords($domain_name) . ' Has <u>' . $indexed_pages . '</u>external links to page';
} elseif (preg_match('/About (.*?) results/sim', $result_in_html, $regs))
{
$indexed_pages = trim(strip_tags($regs[1])); //use strip_tags to remove bold tags
echo ucwords($domain_name) . ' Has <u>' . $indexed_pages . '</u> external links to page';
} else
{
echo ucwords($domain_name) . ' Has Not Been Indexed # Google.com!';
}
?>
And to find internal backlinks :
<?php
$url = "any url";
$result_in_html = file_get_contents("http://www.google.com/search?q=site:{$url}");
if (preg_match('/Results .*? of about (.*?) from/sim', $result_in_html, $regs))
{
$indexed_pages = trim(strip_tags($regs[1])); //use strip_tags to remove bold tags
echo ucwords($domain_name) . ' Has <u>' . $indexed_pages . '</u> internal links to page';
} elseif (preg_match('/About (.*?) results/sim', $result_in_html, $regs))
{
$indexed_pages = trim(strip_tags($regs[1])); //use strip_tags to remove bold tags
echo ucwords($domain_name) . ' Has <u>' . $indexed_pages . '</u> internal links to page';
} else
{
echo ucwords($domain_name) . ' Has Not Been Indexed # Google.com!';
}
?>