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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
function validate($value): void
{
preg_match_all('/<([a-zA-Z0-9]+)(\s[^>]*)?>/i', $value, $matches);
$invalidTags = array_filter($matches[1], fn($tag) => !in_array(strtolower($tag), $this->allowed));
$invalidTags = array_filter($matches[1], fn ($tag) => !in_array(strtolower($tag), $this->allowed));
if (!empty($invalidTags)) {
die($value);
}
}
validate('lkdsjkfj <br /> dflkjdfkl <br>');