OO PHP类变量空数组意外t_variable [重复]

I wanted to initialize a class array as empty. For some reason, it's giving me the error "unexpected T_VARIABLE." Does anyone have an idea what's wrong with this class variable/array? This is what the class looks like:

class SentenceContentContainer {
    var $strSentence; //theSentence entered
    $arrayOfWords = []; //running the code has issue with this line

    function SentenceContentContainer($strSentence)
    {
        $this->strSentence = $strSentence;
    }

    function addWordToContainer(&$wordToAdd)
    {
        ...
    }
} //SentenceContentContainer

</div>

The code you're using is old PHP 4 syntax for objects, so stop using whatever resource you're learning from and start looking for something recent.

The var keyword and old-style constructors (function with same name as class) are both relics of a bygone age. You should be using the public keyword — assuming you need to access these variables publicly — and __construct() as a constructor function.

class SentenceContentContainer {
    public $strSentence; //theSentence entered
    public $arrayOfWords = []; //running the code has issue with this line

    function __construct($strSentence)
    {
        $this->strSentence = $strSentence;
    }

    function addWordToContainer(&$wordToAdd)
    {
        ...
    }
} //SentenceContentContainer

Note that unless you need to do something like this:

$sent = new SentenceContentContainer("Test sentence");
echo $sent->strSentence;

You should probably declare the variables as private instead of public.

Your variable is not defined correctly

class SentenceContentContainer {
    public $strSentence; //theSentence entered
    public $arrayOfWords = [] // running the code has issue with this line
    ....
}

choose public or private or protected, but var is less explicit, i prefer the others but its your choices. But your class variables must have a visibility keyword.

EDIT: as @AbraCadaver mention in this comment, the official documentation advise you to avoid var keyword

http://php.net/manual/en/language.oop5.visibility.php

Note: The PHP 4 method of declaring a variable with the var keyword is still supported for compatibility reasons (as a synonym for the public keyword). In PHP 5 before 5.1.3, its usage would generate an E_STRICT warning

Here you go:

    <?php

        class SentenceContentContainer {
            protected $strSentence;       //theSentence entered
            protected $arrayOfWords = []; //running the code has issue with this line

            function SentenceContentContainer($strSentence)
            {
                $this->strSentence = $strSentence;
            }

            function addWordToContainer(&$wordToAdd)
            {
                //...
            }
        } //Sentence