Online PHP editor | output for fjHZc

@ 2015-11-11T17:52:06Z

<?php

function GetLuhnCheckDigit($number)  {
	$sum = 0;
	$alt = true;
	$digits = str_split($number);
	for ($i = count($digits) - 1; $i >= 0; $i--) {
		$curDigit = ($digits[$i] - 48);
		if ($alt) {
			$curDigit *= 2;
			if ($curDigit > 9)
				$curDigit -= 9;
		}
		$sum += $curDigit;
		$alt = false;
	}
	if (($sum % 10) == 0 ){
		return 0;
	}
	echo $sum . PHP_EOL;
	return (10 - (abs($sum) % 10));
}
echo GetLuhnCheckDigit(1234567891234567891);

Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: -868 2
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 -868 2

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