根据另一个值从数组中获取特定数据

Question

I have an array that outputs these values:

Array ( 
    [0] => stdClass Object ( 
        [ID] => 6585
        [COLOR] => red 
        [Name] => steve
        ) 
    [1] => stdClass Object ( 
        [ID] => 5476 
        [COLOR] => blue 
        [Name] => sol
        ) 
    [2] => stdClass Object ( 
        [ID] => 7564 
        [COLOR] => yellow 
        [Name] => jake 
        ) 
    [3] => stdClass Object ( 
        [ID] => 3465 
        [COLOR] => green 
        [Name] => helen 
        ) 
    )

Now, I will know the ID of the person, and I need the get the COLOR value for that specific value set. How is this best achieved please?

Answer 1

Something like this:

function getColorById($arr, $id){
    foreach($arr as $item){
        if ($item->ID == $id)
            return $item->COLOR;
    }
    return "blah!";
}

Use like echo getColorById($arr, 3465);

EDIT : The way you have the data leads to slowing down access times. A better suggestion is to (since it seems ID is unique), you'd rather have that as the key to your array. You have integer indices to it, now. Construct the array (unless you are receiving it from some area beyond what you have control over) something like the below:

$arr = array();
$arr["ID_4634"] = <object>;

Answer 2

You probably want change the way you are storing it up for faster access.

With the current format, you will need to loop through the elements and compare colors until you find a match.

for($i=0;$i<count($array);$i++){
  if($array[$i]['ID'] == $id)
    return $array[$i]['COLOR']
}

alternatively, store it with the ID's as the keys.

Answer 3

$users = array();
$count = count($arr);
for ($i = 0; $i < $count; $i++) {
    $users[$arr[$i]['ID']] = array(
        'Name' => $arr[$i]['Name'],
        'COLOR' => $arr[$i]['COLOR']
    );
}
echo $users[$id]['COLOR'];

where $arr represents the array you outputted in your initial post and $id is the id of the person who's color you're trying to access. You can also then get their name by using

echo $users[$id]['Name'];

Answer 4

IDTry below :

for($i=0; $i<count($array); $i++)
{
  if($array[$i]['ID'] == $id)
    return $array[$i]['COLOR'];
}