如何遍历stdObject的数组？

Question

Like in Java when you iterate a list, it's real easy, it's like: while(BLAH.hasNext()) { }, so how do I do that in PHP when I have an array within an stdObject that I want to iterate through each and every item?

I keep getting Catchable fatal error: Object of class stdClass could not be converted to string in /Applications/XAMPP/xamppfiles/htdocs/index.php on line 29

<?php   
    $apiUrl = 'https://api.quizlet.com/2.0/groups/44825?client_id=***BLOCKED FROM PUBLIC***&whitespace=1';

    $curl = curl_init($apiUrl);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $json = curl_exec($curl);
    if ($json) {
        $data = json_decode($json);

        echo "<h1>Sets from \"{$data->name}\"</h1>";

        foreach ($data->sets as $key => $val) {
         echo "$key: $val
";
        }
        echo "</ul>";
        var_dump($data);
    }
    ?>

Answer 1

You can/should use foreach to iterate over every element of an array.

$foo = new stdClass;
$foo->arr = array('1','7','heaven','eleven');

foreach ($foo->arr as $val)
{
    if (is_object($val)) var_dump($val);
    else echo $val;
}

Note the line I added to var_dump sub-objects. The error you were initially getting was that the elements of your sets array were also objects, not strings as expected. If you only need to access certain elements of the set objects, you can access them using $val->property.