Redis autocompletion - in php

compl1.php

<?php
# compl1.php - Redis autocomplete example
# download female-names.txt from http://antirez.com/misc/female-names.txt

$redis = new Redis();
$redis->connect('127.0.0.1');

# Create the completion sorted set
if (!$redis->exists('compl')) {
    
    echo "Loading entries in the Redis DB\n";
    
    foreach (file('female-names.txt') AS $n) {
        $n = trim($n);
        
        for ($l = 0; $l < strlen($n); $l++) {
            $prefix = substr($n, 0, $l);
            
            $redis->zadd('compl', 0, $prefix);
        }
        
        $redis->zadd('compl', 0, $n."*");
    }
}
else {
    echo "NOT loading entries, there is already a 'compl' key\n";
}

# Complete the string "mar"

function complete($redis, $prefix, $count) {
    $results = array();
    $rangelen = 50; # This is not random, try to get replies < MTU size
    $start = $redis->zrank('compl', $prefix);

    if (!$start) {
        return $results;
    }

    while (count($results) < $count) {
        $range = $redis->zrange('compl', $start, $start+$rangelen-1);
        $start += $rangelen;
        
        if (!$range) {
            break;
        }

        foreach ($range AS $entry) {
            $minlen = min(strlen($entry), strlen($prefix));
            
            if (substr($entry, 0, $minlen) != substr($prefix, 0, $minlen)) {
                $count = count($results);
                break;
            }
            if (substr($entry, -1) == "*" && count($results) !== $count) {
                $results[] = substr($entry, 0, -1);
            }
        }
    }
    return $results;
};

foreach (complete($redis, "marcell",50) as $res) {
    echo $res, "\n";
}