PHP find matching property values in an array of objects

Question

I have an array of custom objects and I want to find the objects who have matching property values.

This is my object.php:

class game_list
{
    var $team_name;
    var $field_nr;
    var $time;

    /**
     * @return mixed
     */
    public function getTeamName()
    {
        return $this->team_name;
    }

    /**
     * @param mixed $team_name
     */
    public function setTeamName($team_name)
    {
        $this->team_name = $team_name;
    }

    /**
     * @return mixed
     */
    public function getFieldNr()
    {
        return $this->field_nr;
    }

    /**
     * @param mixed $field_nr
     */
    public function setFieldNr($field_nr)
    {
        $this->field_nr = $field_nr;
    }

    /**
     * @return mixed
     */
    public function getTime()
    {
        return $this->time;
    }

    /**
     * @param mixed $time
     */
    public function setTime($time)
    {
        $this->time = $time;
    }
}

So I have an array with x number of these objects. I want to find objects which have the same $field_nr and $time values. For example:

If two objects on my array, X and Y, both have $field_nr = 1 and $time = "12:00" I want to print out "Match!".

This is what I am doing currently:

//getPlaySchedule returns my array($feedback) of objects
$feedback= getPlaySchedule($cup_name, $cup_year, $division);

for($x=0; $x<count($feedback); $x++){
    $time = $feedback[$x]->getTime();
    $field = $feedback[$x]->getFieldNr();
    $team = $feedback[$x]->getTeamName();

    for($y=0; $y<count($feedback); $y++){
        if($time == $feedback[$y]->getTime() && $field == $feedback[$y]->getFieldNr() && $team != $feedback[$y]->getTeamName()){

            echo 'Match!';
        }
    }
}

My solution, however, prints out "Match!" two times for each match. Is there a better way of finding these matches in my object array?

Marcus

vaso123 · Accepted Answer · 2014-12-23 11:23:34Z

This is because you not store, what you've checked, and every time loop through the whole array. For example, if you have object A,B,C,D,E,F, first check the A. Let say, A will match D. When you check D, D will match A.

So you need to store it into an array, or insert a pointer, what objects checked already, and when checkin D, skip A, B, C.

A possible solution, if you set a counter, in my example $z, and start the second loop from that. This prevent the script to check again what you've already checked. Code not tested.

$z = 0;
for ($x = 0; $x < count($my_array); $x++) {
    $time = $feedback[$x]->getTime();
    $field = $feedback[$x]->getFieldNr();
    $team = $feedback[$x]->getTeamName();
    for ($y = $z; $y < count($my_array); $y++) {
        if ($time == $feedback[$y]->getTime() && $field == $feedback[$y]->getFieldNr() && $team != $feedback[$y]->getTeamName()) {
            echo 'Match!';
        }
    }
    $z++;
}

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