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Filename : class-event-id-generator.php

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<?php
namespace PixelYourSite;

final class EventIdGenerator {

    public static function guidv4() {
        $data = openssl_random_pseudo_bytes(16);

        $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // set version to 0100
        $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // set bits 6-7 to 10

        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
}