PHP数组无法正确接受变量

Question

I have an array in PHP where some of the inputs are just literal strings while one input has a variable inserted. I am getting an error that says "syntax error, unexpected "", expecting ')' on line 66". This doesn't make sense to me as it is simply an array of strings, and I hadn't closed the array or done anything funky yet.

Here is my code.

private $headerLink;

private $header = array(
    "<header>",
    "\t\t<h1><a href=$headerLink>Daily Drop</a></h1>",
    "\t</header>"
);

$headerLink is initialized in the constructor so it is not because it is empty. I even tried just setting it to be "test" to make sure that wasn't it but it did not work.

Does anyone know what is causing this error and how to fix it?

Thanks so much!

Answer 1

Object attributes must be initialized with fixed/constant values. They cannot be the result of an expression:

private $foo = 'bar'; // ok.
private $bar = 'baz' . 'qux'; // bad, this is an expression
private $baz = 'foo' . $foo;
// also bad - expression + undefined variable, should be $this->foo anyways

In your case:

php > class foo { private $foo = array('foo', $bar, 'baz'); }
PHP Parse error:  syntax error, unexpected T_VARIABLE, expecting ')' in php shell code on line 1
php > class foo { private $foo = array('foo', 'bar', 'baz'); }
php >