Array is treated as string in Chapter 5, pp.57-58 (PDF version)

[tolgamorf]

In Chapter 5: Unit Testing 101, Section: Making the Test Pass, pages: 57 and 58 (PDF version):

The signature of the function link_to() causes $parameters variable to be treated as a string and PHPUnit gives the following error:

- INFO - PHPUnit 3.7.22 by Sebastian Bergmann.
> [#] 
> [#] Configuration read from /Users/tolga/Sites/lesson/phpunit.xml
> [#] 
> [#] {"error":{"type":"ErrorException","message":"Invalid argument supplied for foreach()","file":"\/Users\/tolga\/Sites\/lesson\/app\/helpers.php","line":8}}

Signature of the function

function link_to($url, $body, $parameters = null)

line where error occurs

foreach($parameters as $attribute => $value)

I am not sure if this error occurs due to a configuration flag in my PHP installation (using 5.5.1), but it can be fixed by either using $parameters = array() or $parameters = [] for the last argument.