function bsearch( $findwhat, $inwhat ) {
    $min = 0;
    $max = count( $inwhat ) - 1;
    // /* I forgot this before testing
    if ( $max == $min )
        return false;
    // */
    do {
        $halfway = floor( ( $max - $min ) / 2 ) + $min;
        if ( $inwhat[$halfway] == $findwhat )
            return true;
        if ( $inwhat[$halfway] > $findwhat )
            $max = $halfway;
        if ( $inwhat[$halfway] < $findwhat )
            $min = $halfway + 1;
        if ( $min == $max ) {
            // /* I forgot this before testing
            if ( $inwhat[$min] == $findwhat )
                return true;
            // */
            return false;
        }
    } while( true );
}