ember-cli How to set default value from form select?

My template:

<select name="lang" id="lang" onchange=>
    <option value="">--Choose--</option>
    
    <option value=""></option>
    
</select>

lang.url has one of the values: ['php', 'javascript', ...]

My Controller:

lang: 'php', //this is not working, I am thinking of something like lang.url or lang.get('url') but looks like it is still not right ..
actions: {
selectOption: function(option) { 
  this.set("lang", option);
}

How can I set the default value of select to php?