PHP is reporting a "Wrong datatype for first argument" error when using an object as the needle argument for the in_array() function.  The code below will generate the error:

<?php

class Foo
{
 
}

$foo = new Foo();
$test = array(1,2,3,4,5);
 
if (in_array($foo,$test))
{
   print "Yes";
}
else
{
   print "No";
}

?>