Finding array items PHP - php

Question

I have gone code blind and don't know how to get the results I need to output values in a desired format.
I have a search function on an internal website which queries MSSQL based on multiple strings. For instance if a user enters "CCENT MCSE" the query will return all users with that have either certification accredited to them.
To be clear this will return all users who have CCENT cerfificate OR MCSE
My boss now want to change this to AND by using an operator (+) sign so when a user enters "CCENT+MCSE" the query should return users who have the CCENT AND MCSE certification.
The way I have built the query is to explode the search string into an array referencing the + sign as the delimiter.
My SQL statement pulls back the following result
Array
(
[0] => Array
(
[username] => mshort
[fname] => Matthew
[lname] => Short
[location_name] => CENTRAL REMOTE
[grade_name] => E6
[skill_name] => CCENT
)
[1] => Array
(
[username] => mark.parry
[fname] => Mark
[lname] => Parry
[location_name] => CENTRAL OFFICE
[grade_name] => E4
[skill_name] => MCSE Messaging
)
[2] => Array
(
[username] => mark.parry
[fname] => Mark
[lname] => Parry
[location_name] => CENTRAL OFFICE
[grade_name] => E4
[skill_name] => CCENT
)
)
What needs to happen in this case is I need to display only unique users who have both CCENT AND MCSE and discard the users who only have one of them.
In the above example I need to output only Mark Parry and discard Matthew Short
I am not sure how to do it. Please can you help?
Thanks
The SQL Statement
SELECT username,fname,lname,el.location_name, eg.grade_name,el.location_name
,sl.skill_nameFROM engineer e
INNER JOIN engineer_skills es ON e.id=es.engineer_id INNER JOIN skills_list sl ON es.skill_id=sl.id
INNER JOIN engineer_grades eg ON e.grade=eg.id
INNER JOIN engineer_location el ON e.location=el.id INNER JOIN team t ON e.team=t.id
WHERE e.id > 0 AND '.$sql_where.' ORDER BY lname'
$sql_where is this
sl.skill_name LIKE '%".$search[$i]."%' OR
and I strip the last OR

Answer 1

You could filter the array (assuming it is names $data)
First, emulate group by username
$result = array();
foreach($data as $item) {
if(!isset($result[$item["username"]])) $result[$item["username"]] = $item;
else $result[$item["username"]]["skill_name"].="+".$item["skill_name"];
}
Second, filter the result
$filter = array("CCENT","MCSE");
function skill_and_filter($item) {
global $filter;
foreach($filter as $f) if(strpos($item["skill_name"],$f)===false) return false;
return true;
}
$result = array_filter($result,"skill_and_filter");