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Edit File: SanitizeTimestamp.php
<?php namespace GeminiLabs\SiteReviews\Modules\Sanitizers; use GeminiLabs\SiteReviews\Modules\Date; class SanitizeTimestamp extends StringSanitizer { public function run(): string { $timestamp = $this->value(); if (glsr(Date::class)->isTimestamp($timestamp)) { return $timestamp; } return ''; // this is why it needs to be sanitized as a string! } }