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@ 2022-03-16T23:42:12Z

<?php

$allowed_html = [
    'div' => [ 'class' => true ],
];

$elem = 'DIV';

var_dump( ( ! isset( $allowed_html[ $elem ] ) ) );
var_dump( ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) );

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
strtolower: documentation ( source)

preferences:dark modelive preview

29.56 ms | 405 KiB | 5 Q