在嵌套数组中使用substr_count

Question

I'm trying to pull out certain groups of keywords from a block of text using substr_count and have it count how many times the words in each group appears.

I've created an array called $keywords, within it is another set of arrays which contain the actual keywords I am looking for.

This is my current code:

$textDump = "random bunch of text";

$keyWordsSports = array("nba", "raptor", "ufc", "basektball", "gym", "mma", "realgm", "running");
$keyWordsTech = array("apple", "rim", "blackberry", "facebook", "twitter", "google" );
$keywords = array($keyWordsSports, $keyWordsTech);
foreach ($keywords as $item){
    foreach ($item as $newItem){
        $number += substr_count(strtolower($textDump), strtolower($newItem));
        echo $number;
    };
};

My problem is that it counts all the keywords within all the arrays and adds everything together, what I want is just the total for each group of keywords. Any ideas on what I should do?

Answer 1

$keywords = array("sports"=>$keyWordsSports, "tech"=>$keyWordsTech);
$count=array("sports"=>0,"tech"=>0);
foreach ($keywords as $key=>$item){
    foreach ($item as $newItem){
        $count[$key] += substr_count(strtolower($textDump), strtolower($newItem));
    }
}
print_r($count);

Edit: Live example