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<?php
$str = crc32("Hello World!");
printf("%u\n", $str);
?>

<?php
$str = crc32("Hello world!");
echo 'Without %u: ' . $str . "<br>";
echo 'With %u: ';
printf("%u", $str);
?>

Without %u: 461707669
With %u: 461707669

<?php
$str = crc32("Hello world.");
echo 'Without %u: ' . $str . "<br>";
echo 'With %u: ';
printf("%u", $str);
?>

Without %u: -1959132156
With %u: 2335835140