QueryCounter.php

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<?php

class Elgg_Database_QueryCounter {

    protected $initial;

    protected $db;

    public function __construct(Elgg_Database $db) {
        $this->db = $db;
        $this->initial = $db->getQueryCount();
    }

    public function getDelta() {
        return $this->db->getQueryCount() - $this->initial;
    }

    public function setDeltaHeader($key = 'Default') {
        $delta = $this->getDelta();

        header("X-ElggQueryDelta-$key: $delta", true);
    }

    public function getDeltaScript($key = 'Default') {
        $delta = $this->getDelta();

        $msg = json_encode("ElggQueryDelta-$key: $delta");
        return "<script>console.log($msg)</script>";
    }
}