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<?php $allowed_html = [ 'div' => [ 'class' => true ], ]; $elem = 'DIV'; var_dump( ( ! isset( $allowed_html[ $elem ] ) ) ); var_dump( ( ! isset( $allowed_html[ strtolower( $elem ) ] ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
bool(true) bool(false)

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