laravel min max number validation rule

- 
if ( isset($request['iMinimumAmount']) && isset($request['iMaximumAmount']) ) {
    if( $request['iMinimumAmount'] >= $request['iMaximumAmount'] ){
        $rules['iMaximumAmount']   = 'numeric|min: '.($request['iMinimumAmount']+1);
        $msg['iMaximumAmount.min'] = 'The maximum order amount is less than the minimum order amount.';
    }
}
$validator = Validator::make($add_laundry, $rules,$msg);
if ($validator->fails()) {
    return redirect()->back()->withErrors($validator)->withInput($request->all());
}

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