Entering numbers from form input into an array PHP

Entering numbers from form input into an array PHP

<form method="post" action = "handler.php" >
<input type="text" name="number1" />
<input type="text" name="number2" />
<input type="text" name="number3" />
<input type="text" name="number4" />
<input type="text" name="number5" />
etc..
I have a form set up like this to take in 10 different numbers. I want to
add each of these numbers to an array so that I can sort the numbers.
$numArr = ();
I have tried everything from array_push to call the $_POST['number1']
directly in the array itself. Every time I do echo $numArr all i get is an
empty array as an output.