Get a single value from count()

I’m trying to get the number of ids in an array but my code outputs the count like an array instead of giving me a single value.

 <?php 
    foreach ($studentlistbysection as $stlist) {
        $numstudent[] = $stlist->id;
        echo count($numstudent);
    }

This outputs the number as 12345678910 instead of a single value like 10
How do I count the number of ids in my array?

>Solution :

You should count it after this loop

foreach ($studentlistbysection as $stlist) {
        $numstudent[] = $stlist->id;
    }
echo count($numstudent);