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sol2010

Hook Error with array

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I am using this hook to get additional notifications when a support department ticket is opened.  However, after upgrade to PHP 8.1 and the new WHMCS version, I am getting an error;

 
I'm getting an error from the code  ' if (in_array($departmentid, $criticaldept)) { '  (line 26) 
 
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TypeError: in_array(): Argument #2 ($haystack) must be of type array, int given in /home/ domain  /public_html/clients/includes/hooks/emergencyticket.php:26
 
Here is the relevent code... why is the array an issue ?
 
function hook_send_emergency_email($vars) {
  
  $criticaldept = 5; // id of emergency department
  $departmentid = $vars['deptid'];
  $company = $vars['companyname'];
    
    if (in_array($vars['deptid'], $criticaldept)) {

 

 
 
Edited by sol2010

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10 hours ago, sol2010 said:

Here is the relevent code... why is the array an issue ?

Because that's not an array. 
Try: 

$criticaldept = array('5'); // id of emergency department

 

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