PHP property exists check

property_exists.php

<?php

$str = json_encode(['test'=>true]);
$obj = json_decode($str);

var_dump($obj);
echo PHP_EOL.'<br>';

$keys = [
    'tests',
    'testies',
    'test'
];

foreach ($keys as $key) {
    if (property_exists($obj, $key)) {
        echo 'got '.$key;
    } else {
        echo $key. ' was not found';
    }
    echo PHP_EOL.'<br>';
}
?>

And showing the values of an object through dynamic variable selection:

<?php

$str = json_encode(['test'=>true, 'pig'=>'headed']);
$obj = json_decode($str);

var_dump($obj);
echo PHP_EOL.'<br>';

$keys = [
    'tests',
    'testies',
    'test',
    'pig'
];

foreach ($keys as $key) {
    if (property_exists($obj, $key)) {
        echo 'got '.$key;
        echo ' | value demo:'.$obj->$key;
    } else {
        echo $key. ' was not found';
    }
    echo PHP_EOL.'<br>';
}
?>