get webpage thumbnails from Google

<?php

$sites = "http://www.broadcastsolutions.com.au/
http://www.kvm.com.au/
http://www.ambertech.com.au/";

$sites = preg_split('/\r\n|\r|\n/', $sites);


echo "
<style>
img {float: left; margin: 15px; }
</style>
";

foreach($sites as $site) 
{
	//cache it
	if ( !$image = apc_fetch( "thumbnail:".$site ) ) 
	{ 
		$image = file_get_contents("https://www.googleapis.com/pagespeedonline/v1/runPagespeed?url=$site&screenshot=true");
		$image = json_decode($image, true); 
		
		//echo "<pre>"; print_r($image); die; 
		
		$image = $image['screenshot']['data'];
		apc_add("thumbnail:".$site, $image, 2400); 
	}

	
	$image = str_replace(array('_','-'),array('/','+'),$image); 
	
	echo "<img src=\"data:image/jpeg;base64,".$image."\" border='1' />";
	

}

?>

Fatal error: Call to undefined function apc_fetch() in F:\xampp\htdocs\cv\a.php on line 19

How am i supposed to solve this ?

### code be like below

//if ( !$image = apc_fetch( "thumbnail:".$site ) ) >>remove

	$image = file_get_contents("https://www.googleapis.com/pagespeedonline/v1/runPagespeed?url=$site&screenshot=true");
	$image = json_decode($image, true); 			
	$image = $image['screenshot']['data'];

// apc_add("thumbnail:".$site, $image, 2400); >> remove

Fatal error: Call to undefined function apc_fetch() in D:\Local server\htdocs\localhost\datsun\test\test.php on line 19

### code be like below

//if ( !$image = apc_fetch( "thumbnail:".$site ) ) >>remove

	$image = file_get_contents("https://www.googleapis.com/pagespeedonline/v1/runPagespeed?url=$site&screenshot=true");
	$image = json_decode($image, true); 			
	$image = $image['screenshot']['data'];

// apc_add("thumbnail:".$site, $image, 2400); >> remove

Or you install the apc package.