extract only numbers from textarea using php

i have a textarea each line in textarea contains numbers or names , i want to extract only number from textarea .

this my code

<?php 

    $allUsers = $_POST['allusers'];
    foreach(explode("\n", $allUsers) as $line) {
        
        if (is_numeric($line)) {
            echo $line."\n";
        }

    }
?>

and example of textarea data :

<textarea>
156444
978455
amoka
123
auman
</textarea>

>Solution :

Remove whitespace around the line before checking if it’s numeric.

    foreach(explode("\n", $allUsers) as $line) {
        $line = trim($line);
        if (is_numeric($line)) {
            echo $line."\n";
        }
    }