Date Field - php allow dates eval

[joomlamate]

I am trying to return certain dates on a date field plugin with the php allow dates function.
But it seems it doesn't work quite well for me.

This is the code I am trying out:

$begin = new DateTime();
$end = new DateTime('2017-04-10');

$interval = new DateInterval('P1D');
$daterange = new DatePeriod($begin, $interval ,$end);

$myAllowedDates = array();

foreach($daterange as $date){
    $thisDate = $date->format("Y-m-d");
    $myAllowedDates[] = $thisDate;
}
return $myAllowedDates;

Even from the moment I am writing this code in the textarea of the php allow dates function field, the editor reports me errors.
For example for line #1 the error is:

Undefined is not an object (evaluating 'e.value')

while in the foreach (line 9) it says:

Expected ')' and instead saw 'as'.
Missing semicolon.
Missing ";" before statement.
Expected an identifier and instead saw ')'.

In the front-end rendering the cal field when using the above php code, I am getting js errors

I am not sure what I am doing wrong. Any ideas?

 

[cheesegrits]

Dunno. Which site / element is this on, so I can take a look.

-- hugh