PHP Foreach Arrays and objects

Question

I have an array of objects; running print_r() returns the output below;

Array
(
    [0] => stdClass Object
        (
            [sm_id] => 1
            [c_id] => 1
        )
    [1] => stdClass Object
        (
            [sm_id] => 1
            [c_id] => 2
        )
)

How to loop through the result and access the student class objects?

score 47 · Accepted Answer · answered Dec 04 '12 at 16:53

47

Use

//$arr should be array as you mentioned as below
foreach($arr as $key=>$value){
  echo $value->sm_id;
}

OR

//$arr should be array as you mentioned as below
foreach($arr as $value){
  echo $value->sm_id;
}

answered Dec 04 '12 at 16:53

GBD

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7

Note that the `$key=>` part is not needed – Explosion Pills Dec 04 '12 at 16:54
2

But it's recommended to include the `$key => ` part. According to this benchmark, the loop is twice as fast, when you *include* the $key part: http://www.phpbench.com/ – Philipp Apr 23 '17 at 20:14

score 6 · Answer 2 · answered Dec 04 '12 at 16:55

Looping over arrays and objects is a pretty common task, and it's good that you're wanting to learn how to do it. Generally speaking you can do a foreach loop which cycles over each member, assigning it a new temporary name, and then lets you handle that particular member via that name:

foreach ($arr as $item) {
    echo $item->sm_id;
}

In this example each of our values in the $arr will be accessed in order as $item. So we can print our values directly off of that. We could also include the index if we wanted:

foreach ($arr as $index => $item) {
    echo "Item at index {$index} has sm_id value {$item->sm_id}";
}

score 2 · Answer 3 · edited Nov 14 '17 at 14:16

2

Assuming your sm_id and c_id properties are public, you can access them by using a foreach on the array:

$array = array(/* objects in an array here */);
foreach ($array as $obj) {
    echo $obj->sm_id . '<br />' . $obj->c_id . '<br />';
}

edited Nov 14 '17 at 14:16

YakovL

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answered Dec 04 '12 at 16:54

imkingdavid

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score 2 · Answer 4 · edited Feb 10 '15 at 09:39

2

Recursive traverse object or array with array or objects elements:

function traverse(&$objOrArray)
{
    foreach ($objOrArray as $key => &$value)
    {
        if (is_array($value) || is_object($value))
        {
            traverse($value);
        }
        else
        {
            // DO SOMETHING
        }
    }
}

edited Feb 10 '15 at 09:39

R3tep

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answered Apr 06 '14 at 12:20

Ronny Sherer

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PHP Foreach Arrays and objects

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