To echo:
echo $_POST['events'][0];
To assign it to a variable:
$eventid = $_POST['events'][0];
To assign the array to a variable and get the value from the new array:
$events = $_POST['events'];
$eventid = $events[0];
[0]
represents the key of the first value since it is set to be 0.
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solved How to get value of array inside another array in php?