Event date change color using minical

I posted a question about the php and got an answer that seemed to work. But upon further review, it only works for the current month. It gives this error when I click on to another month.

Warning in_array()[; Wrong datatype for second argument in ... on line 181

Can anyone help?
minical-home.php
socialbutterflyAsked:
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Ray PaseurConnect With a Mentor Commented:
Good news!  All of the PHP functions are documented in writing on the www.php.net web site.  In the instant case, please see in_array().  According to the documentation, it expects an array for the second argument.  You can test to see if the second argument is an array before you call in_array() and make a programmatic decision whether your script should call the function or choose some other course of action.

If you're new to PHP and want to get a foundation in how the language works, this article may be helpful:
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_11769-And-by-the-way-I-am-new-to-PHP.html
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socialbutterflyAuthor Commented:
It's in this section..

echo $adj."<td ";

if (in_array($i,$activedays))

{ echo 'class=today-event ';
}

if (($i == date('d')) && ($m ==date('m'))){

echo "class=today";

}

echo " width='25px'>$thedate</td>";
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