Check if key exist in one of the objects - php

Question

I would like to check if a key exist in one of the objects :
array (size=2)
0 =>
object(stdClass)[1631]
public 'label' => string 'Monsieur' (length=8)
public 'value' => string '1' (length=1)
public 'selected' => boolean true
1 =>
object(stdClass)[1633]
public 'label' => string 'Madame' (length=6)
public 'value' => string '2' (length=1)
In the example I have one array who contain two objects, the first one contain 'selected' key. I would like to return true if one of them contain 'selected' key. If the objects not contain 'selected' key I would like to return false.
I can have more than two objects. This is only for the example. Is there a function for this?

Answer 1

You can do this work using simple loop
$res = false;
foreach($arr as $item){
if (isset($item->selected))
$res = true;
}
Check result in demo
Note that if your array is large, you need to break loop when finding target key to prevent additional checking
Also you can do this work using array_filter()
$res = !!array_filter($arr, function($item){
return isset($item['selected']);
});

Answer 2

For a start, you don't have an array of arrays there, you have an array of objects.
Simply use property_exists to check if a key is in that object - however note, that it will return true even if value is null.
var_dump(property_exists($array[1], 'key'));
or if you want to test using arrays (docs):
var_dump(array_key_exists((array) $array[1], 'key'));
or as a function
function checkInArray($array, $key)
{
$found = array_filter($array, function($el)
{
return (property_exists((array) $el, $key));
}
return (!empty($found) ? true : false)
}
if (checkInArray($yourArray, 'selected')) {
# do something
}