打印出类型对象的PHP数组

Question

I have an array that looks like this:

Array
(
    [0] => stdClass Object
        (
            [user_id] => 10
            [date_modified] => 2010-07-25 01:51:48
        )

    [1] => stdClass Object
        (
            [user_id] => 16
            [date_modified] => 2010-07-26 14:37:24
        )

    [2] => stdClass Object
        (
            [user_id] => 27
            [date_modified] => 2010-07-26 16:49:17
        )

    [3] => stdClass Object
        (
            [user_id] => 79
            [date_modified] => 2010-08-08 18:53:20
        )

)

and what I need to do is print out the user id's comma seperated so:

10, 16, 27, 79

I'm guessing it'd be in a for loop but i'm looking for the most efficient way to do it in PHP

Oh and the Array name is: $mArray

I've tried this:

foreach($mArray as $k => $cur)
{
    echo $cur['user_id'];
    echo ',';
}

which others have suggested.

However I keep getting this error:

Fatal error: Cannot use object of type stdClass as array in.

I think it's because this array is not a typical array so it requires some different syntax?

Answer 1

Each array element is a (anonymous) object and user_id is a property. Use the object property access syntax ( -> ) to access it:

foreach($mArray as $k => $cur)
{
    echo $cur->user_id;
    echo ',';
}

Answer 2

foreach ($mArray as $cur){
   echo $cur->user_id;
}

you can do it this way since you are working with objects

Answer 3

Use this if you want to avoid the trailing comma ( , ).

$ids = array();
foreach ($array as $obj){
    $ids[] = $obj->user_id;
}

echo join(', ', $ids);

Answer 4

Pretty close...

foreach($mArrray as $k => $cur)
{
  echo $cur->user_id.', ';
}