Dynamic properties name in PHP

问题

There is an object in PHP named $item , and in this object I have properties of

title , title_cn, title_tw

And I would like to create an function that auto generate the properties based on the language, so I coding like this:

<?= $item->title . set_lang(); ?>

And the function:

function set_lang() {
    $CI =& get_instance();
    $lang = $CI->session->userdata('site_lang');
    if ($lang == "english") {
        return "";
    } else if ($lang == "zh_tw") {
        return "_tw";
    } else if ($lang == "zh_cn") {
        return "_cn";
    }
}

However, the name is not generated correctly, it is just the $item->title append with the string of lang code, e.g. my title 1234_tw, titleABC_cn etc...

How to dynamic generate the properties ? Thanks fo helping

回答1:

You should first concatenate $item->title onto set_lang() and place that in a variable.

You can then use that variable to call the right property on the obj.

example

$itemLangTitle = $item->title . set_lang();

echo $item->$itemLangTitle

You can use variables as properties dynamically but be careful with user input as always!

On a sidenote you also need to make sure the property exists otherwise you'll get errors. So make sure that if this doesn't yield anything it should fallback to english naming or something unobstructive ;)

来源：https://stackoverflow.com/questions/30254707/dynamic-properties-name-in-php