ช่วยดู code นี้ให้หน่อยครับ ... Warning: asort() expects parameter 1 to be array,

$source =  
"นายก 15,
นายข 18,
นางค 50,
นายง 20,";
echo $toarr = toArrays($source);
echo $toarr2 = sortprob($toarr);	
function toArrays($text2){
$text2 = preg_replace("/\r\n/", "", $text2);
$bool = preg_match_all("/(.+) (.+),/iU", $text2, $matches, PREG_SET_ORDER);
unset($output);
echo "<pre>";
if($bool !== false) {
//	var_dump($matches);
	foreach($matches as $v){
		$output[$v[1]] = $v[2];
	}
	//var_dump($output);
	print_r ($output);
}
else print "error. can not match pattern";
}
function sortprob ($array){
print_r ($array);
asort($array);
//echo count($fruits);
$num=1;
foreach ($array as $key => $val) {
    //echo "$key = $val\n";
	if(count($array)<11){
		if($num<=3){
		echo $key."  p= ".$val."<br>";
		}
	}

	else if (count($array)>10) {
		if($num<=ceil (count($array)*0.3)){
		echo $key."  p= ".$val."<br>";
		}
	}

   $num++;
}
}
Warning:  asort() expects parameter 1 to be array, null given in C:\AppServ\www\coppae\sortprob.php on line 
Warning:  Invalid argument supplied for foreach() in C:\AppServ\www\coppae\sortprob.php on line