Created attachment 212162 [details]
screenshot of the behavior

Overview:

    When you enter some PHP code which contains double quotes between the
    opening and closing double quote of an HTML attribute, the first double
    quote is considered being the closing double quote of the HTML attribute.

Steps to Reproduce:

    1) Create a new PHP file and enter <tag attribute="<?=$array["key"]?>"/>

Additional Information:

    As a workaround I use single quotes instead of double quotes.
    <tag attribute="<?=$array['key']?>"/>