Mini search engine

Question

I am making a mini search system for urls that are stored in a.txt file, one per line, my problem is the performance issue because I have 5000 urls stored (only) and it is already slow in searching, on the server side I have:

if(isset($_GET['search'])) {
    $urls = array();
    if(trim($_GET['search']) != '') {
        $urls = search_in_urls($_GET['search']);
    }
    echo json_encode($urls);
}
function search_in_urls($search) {
    $file = fopen("urls.txt", "r");
    $urls = array();
    while(!feof($file)){
        $url = fgets($file);
        if (strpos($url, $search) !== false) {
            $urls[] = $url;
        }
    }
    return $urls;
}

Vi this reply accepted in the Soen and would like to implement it, but how to return all lines where a match with my $search?

The search solution I saw that I would like (unless there are better options) to implement was:

if(exec('grep '.escapeshellarg($search).' ./urls.txt')) {
    // do stuff
}

That is, there is some way not to go all the lines looking for a match (set of chars equal to the one I wrote) and return that corresponding line in full? Or that at least for this search to be much faster?

Answer 1

If I understand the question correctly, you want it:

$matches = array();
if(exec('grep '.escapeshellarg($search).' ./urls.txt', $matches)) {
    // $matches contém as linhas encontradas
}

Just pass to the exec reference to an array where the output will be stored. And the output of the grep are just the lines of the file where there were regular expression Matches.