检查数组，以便不添加重复项

Question

Inside my getNearestMeeting method it seems to allow array with the same key and same value.

I'm wanting to check to see if there is key already and meeting_id value. As you see down below that the result from my code so far returns two keys == 6 and they have the same meeting_id == 1812.

What am I doing wrong?

$pupils = array("parent" => array( array ("pupil_name" => "Daniel", "pupil_id" => "5", "pupil_grade" => "87"),
    array ("pupil_name" => "Daniel", "pupil_id" => "5", "pupil_grade" => "86"),
    array ("pupil_name" => "Callum", "pupil_id" => "6", "pupil_grade" => "87")
));

$meetings = array( array("slot_id" => "1", "meeting_id" => "1812", "startTime" => "2016-10-07 14:30:00", 
         "endTime" => "2016-10-07 14:35:00", "grade_id" => "87"),
   array("slot_id" => "2", "meeting_id" => "1812", "startTime" => "2016-10-07 14:35:00", 
         "endTime" => "2016-10-07 14:40:00", "grade_id" => "87"),
   array("slot_id" => "3", "meeting_id" => "1812", "startTime" => "2016-10-07 14:40:00", 
         "endTime" => "2016-10-07 14:45:00", "grade_id" => "87"),
   array("slot_id" => "4", "meeting_id" => "1813", "startTime" => "2016-10-07 15:05:00", 
         "endTime" => "2016-10-07 15:10:00", "grade_id" => "-1"),
   array("slot_id" => "6", "meeting_id" => "1813", "startTime" => "2016-10-07 15:10:00", 
         "endTime" => "2016-10-07 15:15:00", "grade_id" => "-1"),
   array("slot_id" => "9", "meeting_id" => "1813", "startTime" => "2016-10-07 15:20:00", 
         "endTime" => "2016-10-07 15:25:00", "grade_id" => "-1"),
   array("slot_id" => "10", "meeting_id" => "1813", "startTime" => "2016-10-07 15:30:00", 
         "endTime" => "2016-10-07 15:35:00", "grade_id" => "88"),
   array("slot_id" => "11", "meeting_id" => "1813", "startTime" => "2016-10-07 15:40:00", 
         "endTime" => "2016-10-07 15:45:00", "grade_id" => "88"),
   array("slot_id" => "17", "meeting_id" => "1813", "startTime" => "2016-10-07 15:50:00", 
         "endTime" => "2016-10-07 15:50:00", "grade_id" => "88")
);

function in_array_r($array, $key, $val) {
    foreach ($array as $item) {
        if (key($item) == $key && isset($item[$key]) && $item[$key]["meeting_id"] == $val)
            return true;
        else 
            return false;
    }
}
function getNearestMeeting($meetings){ 
    global $pupils;
    $ignore = array(); 
    $current_pupil_id = "5";
    $current_pupil_grade_id = "87";

    foreach($meetings as $item){
        if($current_pupil_grade_id === $item["grade_id"]){
            $earliest = strtotime($item["endTime"]); 
            $ignore[$current_pupil_id][] = array("meeting_id" => $item["meeting_id"], "endTime" => $item["endTime"]);
            break;
        }
    }

    $counter = 0;
    foreach($pupils["parent"] as $item){
        $counter++;
        foreach($meetings as $item2){ 
            $lastArray = end(end($ignore));
            $previousTime = strtotime($lastArray["endTime"]);
            if(!in_array_r($ignore, $item["pupil_id"], $item2["meeting_id"])) {
                if(isset($previousTime) && strtotime($item2["startTime"]) >= $previousTime && strtotime($item2["startTime"]) >= $earliest){
                    if($item["pupil_grade"] === $item2["grade_id"]){    
                        $ignore[$item["pupil_id"]][] = array("meeting_id" => $item2["meeting_id"], "endTime" => $item2["endTime"]);
                    }
                }
            }                   
        }               
    }
    print_r($ignore);
}

getNearestMeeting($meetings);

result from print_r($ignore);:

Array
(
    [0] => Array
        (
            [5] => Array
                (
                    [meeting_id] => 1812
                    [endTime] => 2016-10-07 14:35:00
                )

        )

    [1] => Array
        (
            [6] => Array
                (
                    [meeting_id] => 1812
                    [endTime] => 2016-10-07 14:40:00
                )

        )

    [2] => Array
        (
            [6] => Array
                (
                    [meeting_id] => 1812
                    [endTime] => 2016-10-07 14:45:00
                )

        )

)

Answer 1

After the discussion in the Stack Overflow PHP Chat, the problems identified were the following:

1. The $ignore array was structured strangely, if a pupil had multiple meetings it would create multiple top-level arrays, when it should have just used one which referenced that particular pupil.
2. The in_array_r function was structured incorrectly.

The end fixes resulted in the following changes:

For #1:

Additions to the $ignore array were changed to:

$ignore[$item["pupil_id"]][] = array("meeting_id" => $item2["meeting_id"], "endTime" => $item2["endTime"]);

With an additional check to ensure $ignore[$item["public_id"]] is an array, and if it wasn't then to create it before appending a new item to it.

For #2:

The in_array_r function was changed to reflect the new array structure:

function in_array_r($array, $key, $val) {
    if(array_key_exists($key, $array)){
        foreach ($array[$key] as $item) {
            if ($item["meeting_id"] === $val)
                return true;
            else
                return false;
        }
    }
}