beta3-z

array_map('unset', get_defined_vars());
unset($GLOBALS);

$array = [
        'user_id'   => 'integer',
        'currency'  => 'float',
        'price'     => 'float',  
    ];

    $targetArray = $_POST;

    foreach( $array as $name => $dataType ) {
        if( isset( $targetArray[$name] ) ) {
            settype( $targetArray[$name], $dataType );
        }
    }