Online PHP editor | output for irZ9r

<?php
class Test {

    public static function validateUPCA($value)
	{
		$upc = strval($value);
		$stringLength = strlen($upc);

		if($stringLength < 12 || $stringLength > 13 || intval($upc)==0)
		{
			return false;
		}
	
		$odd_sum = 0;
		$even_sum = 0;

		for($i = 0; $i < $stringLength - 1; $i++)
		{
			if($i % 2 === 1)
			{
				$even_sum += $upc[$i];
			}
			else
			{
				$odd_sum += $upc[$i];
			}
		}

        if ($stringLength == 12)
        {
            // UPC-A format. Odd Sum * 3
            $total_sum = $even_sum + $odd_sum * 3;
        }
        else
        {
            // EAN format. Even Sum * 3
            $total_sum = $odd_sum + $even_sum * 3;
        }

		$modulo10 = $total_sum % 10;
		$check_digit = $modulo10 == 0 ? 0 : 10 - $modulo10;
	
		return $upc[$stringLength - 1] == $check_digit;
	}
}
	    $value = 840018115309;
	    $res = Test.validateUPCA($value);
	    echo "res: $res\n";

eol versions

based on pGuuG

Output for 7.2.0: Warning: Use of undefined constant Test - assumed 'Test' (this will throw an Error in a future version of PHP) in /in/irZ9r on line 47 Fatal error: Uncaught Error: Call to undefined function validateUPCA() in /in/irZ9r:47 Stack trace: #0 {main} thrown in /in/irZ9r on line 47
Process exited with code 255.
Output for 7.0.0 - 7.1.10: Notice: Use of undefined constant Test - assumed 'Test' in /in/irZ9r on line 47 Fatal error: Uncaught Error: Call to undefined function validateUPCA() in /in/irZ9r:47 Stack trace: #0 {main} thrown in /in/irZ9r on line 47
Process exited with code 255.
Output for 5.3.19 - 5.6.28: Notice: Use of undefined constant Test - assumed 'Test' in /in/irZ9r on line 47 Fatal error: Call to undefined function validateUPCA() in /in/irZ9r on line 47
Process exited with code 255.